WO2021075506A1 - 吸水性樹脂粒子の再生方法 - Google Patents
吸水性樹脂粒子の再生方法 Download PDFInfo
- Publication number
- WO2021075506A1 WO2021075506A1 PCT/JP2020/038947 JP2020038947W WO2021075506A1 WO 2021075506 A1 WO2021075506 A1 WO 2021075506A1 JP 2020038947 W JP2020038947 W JP 2020038947W WO 2021075506 A1 WO2021075506 A1 WO 2021075506A1
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- WO
- WIPO (PCT)
- Prior art keywords
- water
- resin particles
- absorbent resin
- gel
- organic solvent
- Prior art date
Links
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- 239000011347 resin Substances 0.000 title claims abstract description 94
- 229920005989 resin Polymers 0.000 title claims abstract description 94
- 238000000034 method Methods 0.000 title claims abstract description 34
- 230000001172 regenerating effect Effects 0.000 title claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 135
- 239000003960 organic solvent Substances 0.000 claims abstract description 63
- 239000002250 absorbent Substances 0.000 claims description 89
- 239000002904 solvent Substances 0.000 claims description 9
- 239000007787 solid Substances 0.000 claims description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 135
- 239000000499 gel Substances 0.000 description 90
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 54
- 230000008961 swelling Effects 0.000 description 32
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- 239000004745 nonwoven fabric Substances 0.000 description 18
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- 239000007864 aqueous solution Substances 0.000 description 10
- 238000010533 azeotropic distillation Methods 0.000 description 10
- 230000008929 regeneration Effects 0.000 description 10
- 238000010992 reflux Methods 0.000 description 9
- 210000002700 urine Anatomy 0.000 description 9
- 229930195733 hydrocarbon Natural products 0.000 description 8
- 239000000463 material Substances 0.000 description 8
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- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 6
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- 239000002612 dispersion medium Substances 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
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- -1 alicyclic hydrocarbon Chemical class 0.000 description 4
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- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 3
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
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- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
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- 239000011780 sodium chloride Substances 0.000 description 3
- 239000004094 surface-active agent Substances 0.000 description 3
- 230000004580 weight loss Effects 0.000 description 3
- UWFRVQVNYNPBEF-UHFFFAOYSA-N 1-(2,4-dimethylphenyl)propan-1-one Chemical compound CCC(=O)C1=CC=C(C)C=C1C UWFRVQVNYNPBEF-UHFFFAOYSA-N 0.000 description 2
- WGECXQBGLLYSFP-UHFFFAOYSA-N 2,3-dimethylpentane Chemical compound CCC(C)C(C)C WGECXQBGLLYSFP-UHFFFAOYSA-N 0.000 description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- GXDHCNNESPLIKD-UHFFFAOYSA-N 2-methylhexane Chemical compound CCCCC(C)C GXDHCNNESPLIKD-UHFFFAOYSA-N 0.000 description 2
- AORMDLNPRGXHHL-UHFFFAOYSA-N 3-ethylpentane Chemical compound CCC(CC)CC AORMDLNPRGXHHL-UHFFFAOYSA-N 0.000 description 2
- VLJXXKKOSFGPHI-UHFFFAOYSA-N 3-methylhexane Chemical compound CCCC(C)CC VLJXXKKOSFGPHI-UHFFFAOYSA-N 0.000 description 2
- RGSFGYAAUTVSQA-UHFFFAOYSA-N Cyclopentane Chemical compound C1CCCC1 RGSFGYAAUTVSQA-UHFFFAOYSA-N 0.000 description 2
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 description 2
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 2
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 150000001338 aliphatic hydrocarbons Chemical class 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 125000003277 amino group Chemical group 0.000 description 2
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- 150000002576 ketones Chemical class 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- UAEPNZWRGJTJPN-UHFFFAOYSA-N methylcyclohexane Chemical compound CC1CCCCC1 UAEPNZWRGJTJPN-UHFFFAOYSA-N 0.000 description 2
- GDOPTJXRTPNYNR-UHFFFAOYSA-N methylcyclopentane Chemical compound CC1CCCC1 GDOPTJXRTPNYNR-UHFFFAOYSA-N 0.000 description 2
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 2
- TVMXDCGIABBOFY-UHFFFAOYSA-N octane Chemical compound CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 2
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
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- 238000005406 washing Methods 0.000 description 2
- RIRARCHMRDHZAR-UHFFFAOYSA-N (+-)-trans-1,2-Dimethyl-cyclopentan Natural products CC1CCCC1C RIRARCHMRDHZAR-UHFFFAOYSA-N 0.000 description 1
- RIRARCHMRDHZAR-RNFRBKRXSA-N (1r,2r)-1,2-dimethylcyclopentane Chemical compound C[C@@H]1CCC[C@H]1C RIRARCHMRDHZAR-RNFRBKRXSA-N 0.000 description 1
- XAZKFISIRYLAEE-RNFRBKRXSA-N (1r,3r)-1,3-dimethylcyclopentane Chemical compound C[C@@H]1CC[C@@H](C)C1 XAZKFISIRYLAEE-RNFRBKRXSA-N 0.000 description 1
- XAZKFISIRYLAEE-KNVOCYPGSA-N (1r,3s)-1,3-dimethylcyclopentane Chemical compound C[C@H]1CC[C@@H](C)C1 XAZKFISIRYLAEE-KNVOCYPGSA-N 0.000 description 1
- BZHMBWZPUJHVEE-UHFFFAOYSA-N 2,3-dimethylpentane Natural products CC(C)CC(C)C BZHMBWZPUJHVEE-UHFFFAOYSA-N 0.000 description 1
- 125000000954 2-hydroxyethyl group Chemical group [H]C([*])([H])C([H])([H])O[H] 0.000 description 1
- AUZRCMMVHXRSGT-UHFFFAOYSA-N 2-methylpropane-1-sulfonic acid;prop-2-enamide Chemical compound NC(=O)C=C.CC(C)CS(O)(=O)=O AUZRCMMVHXRSGT-UHFFFAOYSA-N 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 description 1
- SJIXRGNQPBQWMK-UHFFFAOYSA-N DEAEMA Natural products CCN(CC)CCOC(=O)C(C)=C SJIXRGNQPBQWMK-UHFFFAOYSA-N 0.000 description 1
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- 229920005372 Plexiglas® Polymers 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 1
- ONAIRGOTKJCYEY-UHFFFAOYSA-N Sucrose monostearate Chemical compound CCCCCCCCCCCCCCCCCC(O)=O.OC1C(O)C(CO)OC1(CO)OC1C(O)C(O)C(O)C(CO)O1 ONAIRGOTKJCYEY-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000004520 agglutination Effects 0.000 description 1
- 230000004931 aggregating effect Effects 0.000 description 1
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 description 1
- 229910000387 ammonium dihydrogen phosphate Inorganic materials 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 210000001124 body fluid Anatomy 0.000 description 1
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- 238000012662 bulk polymerization Methods 0.000 description 1
- LLSDKQJKOVVTOJ-UHFFFAOYSA-L calcium chloride dihydrate Chemical compound O.O.[Cl-].[Cl-].[Ca+2] LLSDKQJKOVVTOJ-UHFFFAOYSA-L 0.000 description 1
- 229940052299 calcium chloride dihydrate Drugs 0.000 description 1
- 239000002738 chelating agent Substances 0.000 description 1
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- 238000010908 decantation Methods 0.000 description 1
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- 230000006866 deterioration Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 description 1
- 229910000388 diammonium phosphate Inorganic materials 0.000 description 1
- 235000019838 diammonium phosphate Nutrition 0.000 description 1
- GYZLOYUZLJXAJU-UHFFFAOYSA-N diglycidyl ether Chemical compound C1OC1COCC1CO1 GYZLOYUZLJXAJU-UHFFFAOYSA-N 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000010528 free radical solution polymerization reaction Methods 0.000 description 1
- DMEGYFMYUHOHGS-UHFFFAOYSA-N heptamethylene Natural products C1CCCCCC1 DMEGYFMYUHOHGS-UHFFFAOYSA-N 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229940050906 magnesium chloride hexahydrate Drugs 0.000 description 1
- DHRRIBDTHFBPNG-UHFFFAOYSA-L magnesium dichloride hexahydrate Chemical compound O.O.O.O.O.O.[Mg+2].[Cl-].[Cl-] DHRRIBDTHFBPNG-UHFFFAOYSA-L 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- FQPSGWSUVKBHSU-UHFFFAOYSA-N methacrylamide Chemical compound CC(=C)C(N)=O FQPSGWSUVKBHSU-UHFFFAOYSA-N 0.000 description 1
- GYNNXHKOJHMOHS-UHFFFAOYSA-N methyl-cycloheptane Natural products CC1CCCCCC1 GYNNXHKOJHMOHS-UHFFFAOYSA-N 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 235000019837 monoammonium phosphate Nutrition 0.000 description 1
- 229940088644 n,n-dimethylacrylamide Drugs 0.000 description 1
- YLGYACDQVQQZSW-UHFFFAOYSA-N n,n-dimethylprop-2-enamide Chemical compound CN(C)C(=O)C=C YLGYACDQVQQZSW-UHFFFAOYSA-N 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 239000012985 polymerization agent Substances 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- 238000012673 precipitation polymerization Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000011164 primary particle Substances 0.000 description 1
- 239000007870 radical polymerization initiator Substances 0.000 description 1
- 238000010526 radical polymerization reaction Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000001632 sodium acetate Substances 0.000 description 1
- 235000017281 sodium acetate Nutrition 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 229910001948 sodium oxide Inorganic materials 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 239000012798 spherical particle Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000010558 suspension polymerization method Methods 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/34—Regenerating or reactivating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
- B01J20/26—Synthetic macromolecular compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
- B01J20/26—Synthetic macromolecular compounds
- B01J20/265—Synthetic macromolecular compounds modified or post-treated polymers
- B01J20/267—Cross-linked polymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28002—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their physical properties
- B01J20/28011—Other properties, e.g. density, crush strength
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/34—Regenerating or reactivating
- B01J20/3425—Regenerating or reactivating of sorbents or filter aids comprising organic materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/34—Regenerating or reactivating
- B01J20/345—Regenerating or reactivating using a particular desorbing compound or mixture
- B01J20/3475—Regenerating or reactivating using a particular desorbing compound or mixture in the liquid phase
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/34—Regenerating or reactivating
- B01J20/3483—Regenerating or reactivating by thermal treatment not covered by groups B01J20/3441 - B01J20/3475, e.g. by heating or cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2220/00—Aspects relating to sorbent materials
- B01J2220/50—Aspects relating to the use of sorbent or filter aid materials
- B01J2220/68—Superabsorbents
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
Definitions
- the present invention relates to a method for regenerating water-absorbent resin particles.
- Water-absorbent resin particles are widely used in the fields of sanitary materials such as disposable diapers and sanitary products, agricultural and horticultural materials such as water retention agents and soil conditioners, and industrial materials such as water stop agents and dew condensation inhibitors.
- the used water-absorbent resin particles are generally discarded.
- used water-absorbent resin particles are also recycled and reused (for example, Patent Document 1).
- the conventional method for regenerating water-absorbent resin particles has a problem that the water-absorbing performance of the regenerated particles is deteriorated as compared with the particles before water absorption.
- An object of the present invention is to provide a method for regenerating water-absorbent resin particles having excellent recoverability of water-absorbing performance.
- the method for regenerating the water-absorbent resin particles of the present invention includes treating the water-absorbed water-absorbent resin particles with hot water and treating the water-absorbent resin particles after the hot water treatment with a hydrophilic organic solvent.
- water and at least a part of the solvent are removed from the water-absorbent resin particles after the treatment with the hydrophilic organic solvent, and the water content and the solvent are added to the total amount of the water-absorbent resin particle solids, the water content and the solvent. It may further include reducing the total amount to 15% by mass or less.
- the upper limit value or the lower limit value of the numerical range of one step can be arbitrarily combined with the upper limit value or the lower limit value of the numerical range of another step.
- the upper limit value or the lower limit value of the numerical range may be replaced with the value shown in the examples.
- Water-soluble means that it exhibits a solubility in water of 5% by mass or more at 25 ° C.
- the materials exemplified in the present specification may be used alone or in combination of two or more.
- the content of each component in the composition means the total amount of the plurality of substances present in the composition when a plurality of substances corresponding to each component are present in the composition, unless otherwise specified.
- “Saline” refers to a 0.9% by mass sodium chloride aqueous solution.
- the method for regenerating the water-absorbent resin particles according to the present embodiment is to treat the water-absorbed water-absorbent resin particles with hot water and to treat the water-absorbent resin particles after the hot water treatment with a hydrophilic organic solvent. Including.
- the water-absorbing water-absorbent resin particles (water-absorbent resin particles after water absorption) used in the regeneration method according to the present embodiment may be those that have absorbed water, and may be, for example, water-absorbent resin particles after use.
- the water-absorbent resin particles after water absorption may be, for example, water-absorbent resin particles that have absorbed a body fluid such as urine or blood, or an arbitrary aqueous liquid such as rainwater or seawater.
- the regeneration method according to the present embodiment is particularly suitable for regeneration of water-absorbent resin particles after absorbing an ion-containing aqueous liquid such as urine.
- the water-absorbing water-absorbent resin particles used in the regeneration method according to the present embodiment do not contain a water-containing gel-like polymer obtained during the process of polymerizing the monomer to produce the water-absorbent resin particles.
- the water-absorbing water-absorbent resin particles used in the regeneration method according to the present embodiment will also be referred to as “swelling gel”.
- the swollen gel may be in a state of being mixed with a fibrous substance such as pulp.
- each step such as hot water treatment and hydrophilic organic solvent treatment described in detail below may be performed on the swelling gel alone, or the swelling gel and other fibrous substances and the like. It may be done for a mixture with the material.
- the step of separating the swelling gel from the other material such as the fibrous material is, for example, before hot water treatment. It may be performed in advance, before the hydrophilic organic solvent treatment after the hot water treatment, before the drying step after the hydrophilic organic solvent treatment, or after the drying step.
- the method for separating the swelling gel from the mixture of the swelling gel and a fibrous material such as pulp may be a method that does not substantially dissolve or decompose the swelling gel (water-absorbent resin particles), for example, swelling gel and pulp.
- examples thereof include a method of filtering the mixed dispersion liquid containing the mixture in the liquid by a screen, a method of classifying by wind power after drying, and the like. Separation of the swollen gel from the mixture may also be carried out in the hot water treatment described later.
- Treating the swelling gel with hot water may mean bringing the swelling gel into contact with hot water, specifically, for example, immersing the swelling gel in hot water or immersing the swelling gel in hot water with stirring.
- the swelling gel can be sprinkled with hot water or the like.
- the hot water treatment also has the effect of disinfecting the swollen gel. From the viewpoint of cleaning efficiency and disinfecting effect, as the treatment with hot water, a method of immersing the swollen gel in hot water is preferable, and a method of immersing the swollen gel in hot water while stirring is more preferable.
- hot water means water having a temperature of 65 ° C. or higher.
- the water temperature of hot water is preferably 65 ° C. or higher, more preferably 80 ° C. or higher, further preferably 90 ° C. or higher, and more preferably 95 ° C. or higher. Even more preferable.
- the swollen gel which is typically used, is more purified than before the hot water treatment, and the water-absorbent resin particles are not substantially dissolved or decomposed.
- the water may contain other components.
- pure water, ion-exchanged water, distilled water, tap water, filtered river water and the like are preferable.
- the pH of the hot water is preferably 5 to 9, more preferably 6 to 8.
- the amount of hot water used may be 5 times or more, preferably 10 times or more, and more preferably 50 times or more the total amount of the swollen gel.
- the amount of hot water used may be, for example, 100 times or less the total amount of the swollen gel.
- the time of the hot water treatment may be appropriately adjusted depending on the amount of the swollen gel to be treated, and may be, for example, 10 minutes or more, 30 minutes or more, or 1 hour or more.
- the time of hot water treatment may be, for example, within 5 hours or within 2 hours.
- the hot water treatment may be carried out a plurality of times, for example, twice.
- the swollen gel after the hot water treatment and the hot water may be once filtered off, and then the hot water treatment may be performed again as described above.
- the swelling gel absorbs more water and swells when it is treated with hot water.
- the swollen gel is treated with hot water and then further treated with a hydrophilic organic solvent.
- Treating the swelling gel with a hydrophilic organic solvent may mean bringing the swelling gel into contact with the hydrophilic organic solvent.
- the swelling gel is immersed in the hydrophilic organic solvent and swollen with stirring. This can be done by immersing the gel in a hydrophilic organic solvent, sprinkling a hydrophilic organic solvent on the swollen gel, or the like.
- the hydrophilic organic solvent treatment results in a gel having a smaller volume than the swollen gel before the hydrophilic organic solvent treatment.
- at least a part of impurities adhering to the surface of the swollen gel can also be removed by the treatment with a hydrophilic organic solvent.
- a method of immersing the swelling gel in the hydrophilic organic solvent is preferable, and a method of immersing the swelling gel in the hydrophilic organic solvent with stirring is more preferable.
- the hydrophilic organic solvent means an organic solvent having a solubility of 100 g / L or more in water at 20 ° C.
- the hydrophilic organic solvent may be, for example, alcohol, ketone or the like.
- the alcohol may have, for example, 1 to 5 carbon atoms, preferably 1 to 3 carbon atoms, and specific examples thereof include methanol, ethanol, isopropanol, and the like.
- the ketone has, for example, 1 to 5 carbon atoms, preferably 1 to 3 carbon atoms, and specific examples thereof include acetone.
- the hydrophilic organic solvent may have a boiling point of 50 to 90 ° C., for example.
- methanol or acetone is preferable, and methanol is more preferable, from the viewpoint of high water absorption performance of the water-absorbent resin particles after regeneration.
- the hydrophilic organic solvent one type may be used, or a plurality of types may be used in combination.
- the hydrophilic organic solvent may be used in the treatment of the swollen gel in the state of a mixed solution mixed with other solvents such as water and / or components.
- the content of the hydrophilic organic solvent in the mixed solution may be 75% by mass or more, preferably 80% by mass or more, more preferably 90% by mass or more, and 95% by mass, based on the total amount of the mixed solution. It is more preferably mass% or more, and even more preferably 98 mass% or more.
- the amount of the hydrophilic organic solvent used may be 1 times or more, 3 times or more, 5 times or more, or 10 times or more the total mass of the swollen gel. Is preferable.
- the amount of the hydrophilic organic solvent used may be, for example, 20 times or less the total mass of the swollen gel.
- the treatment with a hydrophilic organic solvent may be carried out, for example, at room temperature or higher and below the boiling point of the hydrophilic organic solvent used, and specifically, it can be carried out at, for example, 20 to 50 ° C.
- hydrophilic organic solvent separated after use may be purified by a process such as distillation and then reused for the treatment with the hydrophilic organic solvent.
- the hydrophilic organic solvent When the treatment with the hydrophilic organic solvent is performed by immersion, the hydrophilic organic solvent may be replaced with a new one and the treatment may be performed a plurality of times. When the hydrophilic organic solvent treatment is performed a plurality of times, it is preferable that at least a part of the hydrophilic organic solvent used in the treatment and the gel are once separated, and then the next treatment is performed.
- the total treatment with the hydrophilic organic solvent may be carried out for, for example, 30 minutes or more, 1 hour or more, or 2 hours or more, and may be, for example, 5 hours or less, 3 hours or less, or 2 hours or less.
- the water content and hydrophilicity with respect to the total amount of the gel (total amount of water-absorbent resin particle solids, water content, and hydrophilic organic solvent).
- the total amount of the organic solvent may be 90% by mass or less, 85% by mass or less, and preferably 80% by mass or less.
- the mass ratio of the water content and the hydrophilic organic solvent to the total amount of the gel may be, for example, 50% by mass or more.
- To remove at least a part of water and a hydrophilic organic solvent means to remove a part of only water, a part of only a hydrophilic organic solvent, and at least one of water and a hydrophilic organic solvent. Including the case of removing the part.
- Examples of the method for removing water and the hydrophilic organic solvent include heat drying, vacuum drying, azeotropic distillation and the like.
- azeotropic distillation for example, in a state where a gel containing water and / or a hydrophilic organic solvent is dispersed in a hydrocarbon dispersion medium, azeotropic distillation is performed by heating from the outside to disperse the hydrocarbon. By refluxing the medium, water and / or hydrophilic organic solvent can be removed.
- the hydrocarbon dispersion medium used for azeotropic distillation may be a chain aliphatic hydrocarbon having 6 to 8 carbon atoms or an alicyclic hydrocarbon having 6 to 8 carbon atoms.
- Hydrocarbon dispersion media include chain aliphatic hydrocarbons such as n-hexane, n-heptane, 2-methylhexane, 3-methylhexane, 2,3-dimethylpentane, 3-ethylpentane, and n-octane; cyclohexane.
- the hydrocarbon dispersion medium may be used alone or in combination of two or more.
- the vacuum drying for example, the gel can be taken out by decantation or filtration by a filter and dried under reduced pressure.
- Moisture removal by azeotropic distillation is preferable from the viewpoint of not excessively deteriorating the performance of the regenerated water-absorbent resin particles. Further, in the case of azeotropic distillation, it is also preferable in that the agglutination of particles generated during the drying treatment is suppressed.
- a method for removing water and a solvent one of these methods may be used, or a plurality of types may be combined.
- the water and solvent may be removed so that the total amount of water and hydrophilic organic solvent is 15% by mass or less with respect to the total amount of water-absorbent resin particle solids, water and hydrophilic organic solvent in the gel. It is preferable, and it is more preferable to carry out so as to be 10% by mass or less.
- the water-absorbent resin particles By performing hot water treatment, hydrophilic organic solvent treatment, and, if necessary, removal of water and hydrophilic organic solvent, the water-absorbent resin particles can be regenerated and brought closer to the state before use (before water absorption).
- the water-absorbent resin particles used in the regeneration method according to the present embodiment may contain, for example, a crosslinked polymer formed by polymerizing a monomer containing an ethylenically unsaturated monomer.
- the crosslinked polymer has a monomer unit derived from an ethylenically unsaturated monomer.
- the water-absorbent resin particles can be produced, for example, by a method including a step of polymerizing a monomer containing an ethylenically unsaturated monomer. Examples of the polymerization method include a reverse phase suspension polymerization method, an aqueous solution polymerization method, a bulk polymerization method, and a precipitation polymerization method.
- the ethylenically unsaturated monomer may be water-soluble.
- water-soluble ethylenically unsaturated monomers include (meth) acrylic acid and its salts, 2- (meth) acrylamide-2-methylpropanesulfonic acid and its salts, (meth) acrylamide, N, N-dimethyl.
- the ethylenically unsaturated monomer has an amino group, the amino group may be quaternized.
- the ethylenically unsaturated monomer may be used alone or in combination of two or more.
- the acid group may be neutralized with an alkaline neutralizer and then used in the polymerization reaction.
- the degree of neutralization of the ethylenically unsaturated monomer by an alkaline neutralizing agent is, for example, 10 to 100 mol%, 50 to 90 mol%, or 60 to 80 mol% of the acidic group in the ethylenically unsaturated monomer. May be%.
- the ethylenically unsaturated monomer is at least one selected from the group consisting of (meth) acrylic acid and salts thereof, acrylamide, methacrylamide, and N, N-dimethylacrylamide. It may contain a compound of the species.
- the ethylenically unsaturated monomer may contain (meth) acrylic acid and a salt thereof, and at least one compound selected from the group consisting of acrylamide.
- a monomer other than the above-mentioned ethylenically unsaturated monomer may be used.
- Such a monomer can be used, for example, by mixing with an aqueous solution containing the above-mentioned ethylenically unsaturated monomer.
- the amount of the ethylenically unsaturated monomer used may be 70 to 100 mol% with respect to the total amount of the monomer.
- the ratio of (meth) acrylic acid and a salt thereof may be 70 to 100 mol% with respect to the total amount of the monomer.
- the water-absorbent resin particles may be crosslinked (surface crosslinked) in the vicinity of the surface. Further, the water-absorbent resin particles may be composed of only polymer particles, but various additional components selected from, for example, a gel stabilizer, a metal chelating agent, a fluidity improver (lubricant), and the like may be further added. It may be included. Additional components may be placed inside the polymer particles, on the surface of the polymer particles, or both. The additional component may be a fluidity improver (lubricant).
- the fluidity improver may contain inorganic particles. Examples of the inorganic particles include silica particles such as amorphous silica.
- the shape of the water-absorbent resin particles used in the regeneration method according to the present embodiment before water absorption may be substantially spherical, crushed, granular, or a shape formed by aggregating primary particles having these shapes. ..
- the medium particle size of the water-absorbent resin particles according to the present embodiment before water absorption may be, for example, 130 to 800 ⁇ m, 200 to 850 ⁇ m, 250 to 700 ⁇ m, or 300 to 600 ⁇ m.
- the regeneration method according to the present embodiment is suitable for regeneration of water-absorbent resin particles having a CRC of about 10 to 60 g / g before use, for example.
- the regeneration method according to the present embodiment further exerts a particularly high regeneration effect in the regeneration of water-absorbent resin particles having a CRC of about 10 to 40 g / g before use, and reaches a level equal to or close to that before use. It is possible to restore the CRC of the water-absorbent resin particles.
- the CRC of the water-absorbent resin particles before use and the water-absorbent resin particles after regeneration by the regeneration method according to the present embodiment, which are used in the regeneration method according to the present embodiment, are, for example, 10 g / g or more, 15 g / g or more. It may be 20 g / g or more, or 23 g / g or more, and may be 60 g / g or less, 50 g / g or less, 40 g / g or less, 35 g / g or less, or 30 g / g or less.
- the water absorption amount of physiological saline under a load of 2.07 kPa before use (hereinafter, also simply referred to as "water absorption amount under load”) is about 15 to 50 mL / g. It is suitable for the regeneration of water-absorbent resin particles.
- the regeneration method according to the present embodiment further exerts a particularly high regeneration effect in the regeneration of water-absorbent resin particles having a water absorption amount under load of about 15 to 35 mL / g before use, and is equivalent to or close to that before use. It is possible to restore the amount of water absorption under the load of the water-absorbent resin particles to the level.
- the amount of water-absorbing resin particles used in the regeneration method according to the present embodiment before use and after regeneration by the regeneration method according to the present embodiment is, for example, 15 mL / g or more, 18 mL / g or more, or 20 mL. It may be ⁇ /g, 40 mL / g or less, or 35 mL / g or less.
- the regenerated water-absorbent resin particles obtained by the regeneration method according to the present embodiment have the same uses as the pre-use water-absorbent resin particles, for example, sanitary materials such as disposable diapers and sanitary products, water retention agents, soil conditioners and the like. It can be used in fields such as agricultural and horticultural materials, water-stopping agents, and industrial materials such as dew condensation inhibitors.
- n-heptane as a hydrocarbon dispersion medium
- n-heptane as a hydrocarbon dispersion medium
- 0.736 g of a maleic anhydride-modified ethylene-propylene copolymer (Mitsui Chemicals Co., Ltd., High Wax 1105A) was added as a polymer-based dispersant, and the mixture was stirred.
- the dispersant was dissolved by raising the temperature to 80 ° C.
- the formed solution was cooled to 50 ° C.
- hydroxylethyl cellulose Suditomo Seika Co., Ltd., HEC AW-15F
- 0.0736 g 0.0736 g (0.272 mmol) of potassium persulfate as a water-soluble radical polymerization agent
- ethylene glycol as an internal cross-linking agent.
- An aqueous solution of the first stage was prepared by adding 0.010 g (0.057 mmol) of diglycidyl ether and dissolving the mixture.
- the first-stage aqueous solution was added to the flask, and the formed reaction solution was stirred for 10 minutes.
- sucrose stearic acid ester Mitsubishi Chemical Foods Co., Ltd., Ryoto Sugar Ester S-370, HLB: 3
- the solution was prepared.
- the surfactant solution was added to the flask, and the inside of the system was sufficiently replaced with nitrogen while stirring at a stirring speed of 550 rpm. Then, the flask was immersed in a water bath at 70 ° C. to raise the temperature of the reaction solution, and polymerization was carried out for 60 minutes to obtain a first-stage polymerization slurry solution.
- the entire amount of the aqueous liquid in the second stage was added to the polymerized slurry liquid in the first stage.
- the flask was again immersed in a water bath at 70 ° C. to raise the temperature, and the polymerization reaction was carried out for 60 minutes to obtain a hydrogel polymer.
- 0.589 g of a 45% by mass diethylenetriamine-5 sodium acetate aqueous solution was added to the hydrogel polymer after the second stage polymerization under stirring. Then, the flask was immersed in an oil bath set at 125 ° C., and 247.9 g of water was extracted from the system while refluxing n-heptane by azeotropic distillation of n-heptane and water. Then, 4.42 g (0.507 mmol) of a 2% by mass ethylene glycol diglycidyl ether aqueous solution was added to the flask as a surface cross-linking agent, and the flask was kept at 83 ° C. for 2 hours.
- n-heptane and water were evaporated at 125 ° C. and dried to obtain polymer particles (dried products).
- the polymer particles are passed through a sieve having an opening of 850 ⁇ m, and 0.5% by mass of amorphous silica (Oriental Silicas Corporation, Toxile NP-S) with respect to the mass of the polymer particles is mixed with the polymer particles.
- amorphous silica Oriental Silicas Corporation, Toxile NP-S
- 230.0 g of water-absorbent resin particles containing amorphous silica were obtained.
- the medium particle size of the water-absorbent resin particles was 354 ⁇ m.
- the sieve on which the removed swelling gel is placed is tilted at an inclination angle of about 30 degrees with respect to the horizontal, and left in that state for 30 minutes to remove excess water, thereby removing the excess water.
- (Swelled water-absorbent resin particles) 122.0 g were obtained. This swollen gel was used as a model for used water-absorbent resin particles.
- composition of the artificial urine used is as follows. Calcium chloride dihydrate 0.025% Diammonium hydrogen phosphate 0.015% Magnesium chloride hexahydrate 0.0496% Ammonium dihydrogen phosphate 0.085% Potassium chloride 0.2% Sodium sulfate 0.2% Remaining: distilled water
- Example 1 (Hot water treatment) As a reflux condenser and a stirrer, a round-bottomed cylindrical separable flask having an inner diameter of 110 mm and a capacity of 2 L was prepared, which was equipped with a stirrer blade having two stages of four inclined paddle blades having a blade diameter of 50 mm. The flask was filled with 90.0 g of the artificial urine absorption and swelling gel and 1000 g of ion-exchanged water, and was immersed in an oil bath at 120 ° C. and heated while stirring at 600 rpm. The swollen gel was washed by stirring for 1 hour from the time when the internal temperature of the flask reached 100 ° C.
- the swollen gel after washing was filtered out using a JIS standard sieve having an opening of 75 ⁇ m.
- a JIS standard sieve having an opening of 75 ⁇ m.
- hydrophilic organic solvent treatment The following hydrophilic organic solvent treatment was carried out in an environment of a temperature of 25 ⁇ 2 ° C. and a humidity of 50 ⁇ 10%. 279.5 g of methanol was weighed into a 1000 mL beaker. While stirring methanol at 600 rpm using a magnetic stirrer bar (8 mm ⁇ ⁇ 30 mm, without ring), 215.0 g of the swollen gel after hot water treatment was dispersed in methanol. The swollen gel was washed and dehydrated by continuing stirring the methanol for 30 minutes. A gel after treatment with methanol was obtained by filtering using a JIS standard sieve having a mesh size of 75 ⁇ m.
- the sieve on which the removed gel is placed is tilted at an inclination angle of about 30 degrees with respect to the horizontal, and left in the draft device for 30 minutes in that state to remove excess water and methanol. 7.6 g of gel after the second methanol treatment was obtained.
- a round-bottomed cylindrical separable flask having an inner diameter of 110 mm and a capacity of 2 L was prepared with a reflux condenser, a cooler, a diversion pipe, and a stirring blade having two stages of four inclined paddle blades having a blade diameter of 50 mm as a stirrer.
- the flask was filled with 5.0 g of the gel after the third methanol treatment and 400 g of n-heptane. Then, the flask is immersed in an oil bath at 125 ° C., and n-heptane is refluxed by azeotropic distillation of n-heptane, water, and methanol until the internal temperature of the flask reaches 98 ° C. I drained the water. Then, n-heptane, methanol and water were distilled off by heating at 125 ° C. to obtain 1.1 g of regenerated water-absorbent resin particles.
- the flask is immersed in an oil bath at 125 ° C., and water is added to the outside of the system until the internal temperature of the flask reaches 98 ° C. while refluxing n-heptane by azeotropic distillation of n-heptane, water and methanol. Was extracted. Then, n-heptane, methanol and water were distilled off by heating at 125 ° C. to obtain 0.6 g of regenerated water-absorbent resin particles.
- a round-bottomed cylindrical separable flask having an inner diameter of 110 mm and a capacity of 2 L was prepared with a reflux condenser, a cooler, a diversion pipe, and a stirring blade having two stages of four inclined paddle blades having a blade diameter of 50 mm as a stirrer.
- the flask was filled with 11.0 g of the gel after the third methanol treatment and 400 g of n-heptane. Then, the flask is immersed in an oil bath at 125 ° C., and water is added to the outside of the system until the internal temperature of the flask reaches 98 ° C.
- a non-woven fabric with a size of 60 mm x 170 mm (product name: Heat Pack MWA-18, manufactured by Nippon Paper Papylia Co., Ltd.) was folded in half in the longitudinal direction to adjust the size to 60 mm x 85 mm.
- a 60 mm ⁇ 85 mm non-woven fabric bag was produced by crimping the non-woven fabrics to each other on both sides extending in the longitudinal direction with a heat seal (a crimped portion having a width of 5 mm was formed on both sides along the longitudinal direction).
- 0.2 g of water-absorbent resin particles were precisely weighed and housed inside the non-woven fabric bag. Then, the non-woven fabric bag was closed by crimping the remaining one side extending in the lateral direction with a heat seal.
- the entire non-woven fabric bag was completely moistened by floating the non-woven fabric bag on 1000 g of physiological saline contained in a stainless steel vat (240 mm ⁇ 320 mm ⁇ 45 mm) without folding the non-woven fabric bag.
- a stainless steel vat 240 mm ⁇ 320 mm ⁇ 45 mm
- the non-woven fabric bag was taken out from the physiological saline solution. Then, the non-woven fabric bag was put in a centrifuge (manufactured by Kokusan Co., Ltd., model number: H-122). After the centrifugal force in the centrifuge reached 250 G, the non-woven fabric bag was dehydrated for 3 minutes. After dehydration, the mass Ma of the non-woven fabric bag containing the mass of the gel was weighed.
- the non-woven fabric bag was subjected to the same operation as described above without accommodating the water-absorbent resin particles, and the mass Mb of the non-woven fabric bag was measured.
- the CRC was calculated based on the following formula. Mc is a precise value of 0.2 g of the mass of the water-absorbent resin particles used in the measurement. The results are shown in Table 1.
- CRC [g / g] ⁇ (Ma-Mb) -Mc ⁇ / Mc
- the amount of water-absorbent resin particles absorbed against physiological saline under a load of 2.07 kPa was measured using the measuring device Y shown in FIG. 1 under an environment of 25 ° C. ⁇ 2 ° C. and a humidity of 50 ⁇ 10%.
- the measuring device Y is composed of a burette unit 71, a conduit 72, a measuring table 73, and a measuring unit 74 placed on the measuring table 73.
- the burette portion 71 has a burette 71a extending in the vertical direction, a rubber stopper 71b arranged at the upper end of the burette 71a, a cock 71c arranged at the lower end of the burette 71a, and one end extending into the burette 71a in the vicinity of the cock 71c. It has an air introduction pipe 71d and a cock 71e arranged on the other end side of the air introduction pipe 71d.
- the conduit 72 is attached between the burette portion 71 and the measuring table 73.
- the inner diameter of the conduit 72 is 6 mm.
- a hole having a diameter of 2 mm is formed in the central portion of the measuring table 73, and the conduit 72 is connected to the hole.
- the measuring unit 74 has a cylinder 74a (made of acrylic resin (plexiglass)), a nylon mesh 74b adhered to the bottom of the cylinder 74a, and a weight 74c.
- the inner diameter of the cylinder 74a is 20 mm.
- the opening of the nylon mesh 74b is 75 ⁇ m (200 mesh). Then, at the time of measurement, the water-absorbent resin particles 75 to be measured are uniformly sprinkled on the nylon mesh 74b.
- the weight 74c has a diameter of 19 mm and the weight 74c has a mass of 59.8 g.
- the weight 74c is placed on the water-absorbent resin particles 75, and a load of 2.07 kPa can be applied to the water-absorbent resin particles 75.
- the burette 71a of the apparatus Y is filled with physiological saline up to the scale, and the holes of the cock 71c, the inside of the conduit 72, and the central hole of the measuring table 73 are filled with saline.
- the weight 74c was placed and the measurement was started. Since the same volume of air as the physiological saline absorbed by the water-absorbent resin particles 75 is quickly and smoothly supplied to the inside of the burette 71a from the air introduction pipe, the water level of the physiological saline inside the burette 71a is reduced. However, the amount of physiological saline absorbed by the water-absorbent resin particles 75 is obtained.
- the scale of the burette 71a is engraved from top to bottom in 0 mL to 0.5 mL increments.
- Example 1 The water absorption performance of the regenerated water-absorbent resin particles obtained in Example 1 was restored to the same level as the particles before water absorption. Moreover, when the regenerated water-absorbent resin particles obtained in Example 1 were observed with a scanning electron microscope, the appearance was restored to the extent that it could not be discriminated from the particles before water absorption.
- the regenerated water-absorbent resin particles obtained in the comparative example showed some deterioration in water absorption performance as compared with the particles before water absorption. Further, when the regenerated water-absorbent resin particles of Comparative Example 1 were observed with a scanning electron microscope, each of the spherical particles constituting the water-absorbent resin particles had a crushed shape.
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Abstract
Description
膨潤ゲルを熱水で処理するとは、膨潤ゲルを熱水と接触させることであってよく、具体的には例えば、膨潤ゲルを熱水に浸漬する、撹拌しながら膨潤ゲルを熱水に浸漬する、膨潤ゲルに熱水をかける等の方法によって行うことができる。膨潤ゲルを熱水で処理することにより、膨潤ゲルに吸収された又は膨潤ゲルに付着した不純物の少なくとも一部を除去し、膨潤ゲルを洗浄することができる。また、熱水処理により、膨潤ゲルの消毒効果も得られる。洗浄効率及び消毒効果の観点から、熱水による処理としては、膨潤ゲルを熱水に浸漬する方法が好ましく、撹拌しながら膨潤ゲルを熱水に浸漬する方法がより好ましい。
本実施形態に係る再生方法では、膨潤ゲルを熱水処理した後、親水性有機溶媒によって更に処理する。膨潤ゲルを親水性有機溶媒で処理するとは、膨潤ゲルと親水性有機溶媒とを接触させることであってよく、具体的には例えば、膨潤ゲルを親水性有機溶媒に浸漬する、撹拌しながら膨潤ゲルを親水性有機溶媒に浸漬する、膨潤ゲルに親水性有機溶媒をかける等の方法によって行うことができる。
親水性有機溶媒処理の後は、ゲルに含まれる水分及び親水性有機溶媒の少なくとも一部を除去することが好ましい。水分及び親水性有機溶媒の少なくとも一部を除去するとは、水分のみの一部を除去する場合、親水性有機溶媒のみの一部を除去する場合、並びに、水分及び親水性有機溶媒のそれぞれ少なくとも一部を除去する場合を含む。
本実施形態に係る再生方法に供される吸水性樹脂粒子は、例えば、エチレン性不飽和単量体を含む単量体の重合により形成された架橋重合体を含んでいてよい。該架橋重合体は、エチレン性不飽和単量体に由来する単量体単位を有する。吸水性樹脂粒子は、例えば、エチレン性不飽和単量体を含む単量体を重合させる工程を含む方法により、製造することができる。重合方法としては、逆相懸濁重合法、水溶液重合法、バルク重合法、沈殿重合法等が挙げられる。
還流冷却器、滴下ロート、窒素ガス導入管、及び、撹拌機として、翼径5cmの4枚傾斜パドル翼を2段で有する撹拌翼を備えた内径11cm、2L容の丸底円筒型セパラブルフラスコを準備した。このフラスコに、炭化水素分散媒としてn-ヘプタン293gを入れ、高分子系分散剤として無水マレイン酸変性エチレン・プロピレン共重合体(三井化学株式会社、ハイワックス1105A)0.736gを添加し、撹拌しつつ80℃まで昇温することにより分散剤を溶解した。形成された溶液を50℃まで冷却した。
500mLのビーカーに、JAYCO人工尿500gを量り取った。人工尿をマグネチックスターラーバー(8mmφ×30mm、リング無し)を用いて600rpmで撹拌させながら、上記製造例にて作製した吸水性樹脂粒子2.0gを、ママコが発生しないように人工尿中に分散させた。60分間撹拌を継続し、吸水性樹脂粒子を十分に膨潤させた。目開き75μmのJIS標準篩を用いて、ビーカーの内容物をろ過した。取り出された膨潤ゲルが載った篩を、水平に対して約30度の傾斜角となるように傾け、その状態で30分間放置することによって余剰の水分を除去することにより、人工尿吸収膨潤ゲル(膨潤した吸水性樹脂粒子)122.0gを得た。この膨潤ゲルを、使用済み吸水性樹脂粒子のモデルとして使用した。
塩化カルシウム二水和物 0.025%
リン酸水素二アンモニウム 0.015%
塩化マグネシウム六水和物 0.0496%
リン酸二水素アンモニウム 0.085%
塩化カリウム 0.2%
硫酸ナトリウム 0.2%
残部:蒸留水
(熱水処理)
還流冷却器、及び、撹拌機として、翼径50mmの4枚傾斜パドル翼を2段有する撹拌翼を備えた内径110mm、2L容の丸底円筒型セパラブルフラスコを準備した。上記フラスコ内に、上記人工尿吸収膨潤ゲル90.0g及びイオン交換水1000gを充填し、600rpmで撹拌しながら120℃のオイルバスに浸漬し加熱した。上記フラスコの内温が100℃に到達した時点から1時間撹拌することで、該膨潤ゲルを洗浄した。洗浄後の膨潤ゲルを目開き75μmのJIS標準篩を用いて濾別した。取り出された膨潤ゲルが載った篩を、水平に対して約30度の傾斜角となるように傾けたまま30分間放置することにより、洗浄後の膨潤ゲルから余剰の水分を除去して、熱水処理後の膨潤ゲルを220.0g得た。
以下の親水性有機溶媒処理は、温度25±2℃、湿度50±10%の環境下で行った。1000mLのビーカーにメタノールを279.5g量り取った。マグネチックスターラーバー(8mmφ×30mm、リング無し)を用いてメタノールを600rpmで撹拌させながら、熱水処理後の膨潤ゲル215.0gをメタノールに分散させた。30分間メタノールの撹拌を継続することにより、膨潤ゲルを洗浄及び脱水した。目開き75μmのJIS標準篩を用いて濾別することにより、メタノール処理後のゲルを得た。取り出されたゲルが載った篩を、水平に対して約30度の傾斜角となるように傾け、その状態でドラフト装置内に30分間放置することにより、余剰の水分及びメタノールを除去し、1回目メタノール処理後のゲルを7.6g得た。
還流冷却器、冷却器、分流管、及び、撹拌機として翼径50mmの4枚傾斜パドル翼を2段有する撹拌翼を備えた内径110mm、2L容の丸底円筒型セパラブルフラスコを準備した。上記フラスコ内に、3回目メタノール処理後のゲル5.0g及びn-ヘプタン400gを充填した。その後、125℃の油浴に上記フラスコを浸漬し、n-ヘプタンと水とメタノールとの共沸蒸留により、n-ヘプタンを還流させながら、上記フラスコの内温が98℃になるまで系外へ水を抜き出した。その後、125℃での加熱によりn-ヘプタン、メタノール及び水を留去して、再生吸水性樹脂粒子1.1gを得た。
実施例1と同様にして人工尿吸収膨潤ゲルの熱水処理を行い、熱水処理後の膨潤ゲルを219.2g得た。還流冷却器、冷却器、分流管、及び、撹拌機として翼径50mmの4枚傾斜パドル翼を2段有する撹拌翼を備えた内径110mm、2L容の丸底円筒型セパラブルフラスコを準備した。上記フラスコ内に、上記熱水処理後の膨潤ゲル110.0g及びn-ヘプタン400gを充填した。その後、125℃の油浴に上記フラスコを浸漬し、n-ヘプタンと水とメタノールの共沸蒸留により、n-ヘプタンを還流させながら、上記フラスコの内温が98℃になるまで系外へ水を抜き出した。その後、125℃での加熱によりn-ヘプタン、メタノール及び水を留去して、再生吸水性樹脂粒子0.6gを得た。
1000mLのビーカーにメタノールを116.0g量り取った。マグネチックスターラーバー(8mmφ×30mm、リング無し)を用いてメタノールを600rpmで撹拌させながら、人工尿吸収膨潤ゲル90.0gをメタノールに分散させた。30分間撹拌を継続することにより、該膨潤ゲルをメタノールによって洗浄及び脱水した。目開き75μmのJIS標準篩を用いて、メタノール処理後のゲルを濾別した。取り出されたゲルが載った篩を、水平に対して約30度の傾斜角となるように傾け、その状態で30分間放置することにより、余剰の水分及びメタノールを除去した。1回目メタノール処理後のゲルを22.2g得た。
以下の方法により、得られた再生吸水性樹脂粒子について、CRC及び荷重下吸水量を測定した。また、上記製造例で得られた吸水性樹脂粒子(吸水前の吸水性樹脂粒子)について、同様にCRC及び荷重下吸水量を測定した。結果を表1に示す。
EDANA法(NWSP 241.0.R2(15)、page.769~778)を参考に、吸水性樹脂粒子のCRCを下記の手順で測定した。測定は、温度25℃±2℃、湿度50±10%の環境下で行った。
CRC[g/g] = {(Ma-Mb)-Mc}/Mc
吸水性樹脂粒子の2.07kPaの荷重下での生理食塩水に対する吸水量を、25℃±2℃、湿度50±10%の環境下で、図1に示す測定装置Yを用いて測定した。測定装置Yは、ビュレット部71、導管72、測定台73、及び、測定台73上に置かれた測定部74から構成される。ビュレット部71は、鉛直方向に伸びるビュレット71aと、ビュレット71aの上端に配置されたゴム栓71bと、ビュレット71aの下端に配置されたコック71cと、コック71cの近傍において一端がビュレット71a内に伸びる空気導入管71dと、空気導入管71dの他端側に配置されたコック71eとを有している。導管72は、ビュレット部71と測定台73との間に取り付けられている。導管72の内径は6mmである。測定台73の中央部には、直径2mmの穴があいており、導管72が連結されている。測定部74は、円筒74a(アクリル樹脂(プレキシグラス)製)と、円筒74aの底部に接着されたナイロンメッシュ74bと、重り74cとを有している。円筒74aの内径は20mmである。ナイロンメッシュ74bの目開きは75μm(200メッシュ)である。そして、測定時にはナイロンメッシュ74b上に測定対象の吸水性樹脂粒子75が均一に撒布される。重り74cの直径は19mmであり、重り74cの質量は59.8gである。重り74cは、吸水性樹脂粒子75上に置かれ、吸水性樹脂粒子75に対して2.07kPaの荷重を加えることができる。装置Yのビュレット71a内には生理食塩水が目盛りのある所まで充填されており、コック71cの穴、導管72の内部、及び測定台73の中央の穴までは食塩水で充填されている。
荷重下吸水量[mL/g]=(Vb-Va)/0.1
吸水性樹脂粒子の乾燥減量を以下の方法で測定した。吸水性樹脂粒子約0.3gを、あらかじめ恒量(W3(g))としたアルミホイルケース(8号)にとり、その合計質量W4(g)を精秤した。精秤された粉体を、内温を105℃に設定した熱風乾燥機(ADVANTEC社製、型式:FV-320)で2時間乾燥させた。粉体をデシケーター中で放冷した後、アルミホイルケース及び吸水性樹脂粒子の合計質量W5(g)を乾燥質量として測定した。以下の式から、吸水性樹脂粒子の乾燥減量を算出した。
乾燥減量(質量%)=[{(W4-W3)-(W5-W3)}/(W4-W3)]×100
Claims (2)
- 吸水した吸水性樹脂粒子を熱水で処理することと、
熱水処理後の前記吸水性樹脂粒子を親水性有機溶媒で処理することとを含む、吸水性樹脂粒子の再生方法。 - 前記親水性有機溶媒処理後の吸水性樹脂粒子から水分及び該溶媒の少なくとも一部を除去し、吸水性樹脂粒子固形分、水分及び該溶媒の合計量に対する、水分及び該溶媒の合計量を15質量%以下にすることを更に含む、請求項1に記載の方法。
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Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003326161A (ja) * | 2002-03-06 | 2003-11-18 | Nippon Shokubai Co Ltd | 吸水性樹脂の再生方法および吸水剤 |
JP2012219172A (ja) * | 2011-04-07 | 2012-11-12 | Mitsui Chemicals Inc | 吸水性ポリマーから得られる新規なポリマー並びにその用途 |
JP2013198862A (ja) | 2012-03-23 | 2013-10-03 | Hokkaido Univ | 使用済み高吸水性ポリマーの再生方法 |
JP2015120834A (ja) * | 2013-12-24 | 2015-07-02 | 株式会社リブドゥコーポレーション | 吸水性樹脂の処理方法 |
JP6771633B1 (ja) * | 2019-05-30 | 2020-10-21 | ユニ・チャーム株式会社 | 使用済み吸収性物品由来の高吸水性ポリマーを再生する方法及び使用済み吸収性物品由来のリサイクル高吸水性ポリマー |
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JPH01292003A (ja) * | 1988-05-19 | 1989-11-24 | Sekisui Plastics Co Ltd | 吸水性樹脂の精製方法 |
JP3731032B2 (ja) * | 2001-11-08 | 2006-01-05 | 株式会社日本吸収体技術研究所 | 再生処理の容易な吸収体製品とその処理方法 |
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EP3023443B1 (en) * | 2011-08-03 | 2018-07-25 | Sumitomo Seika Chemicals CO. LTD. | Water absorbing resin particles, method for manufacturing water absorbing resin particles, absorption body, absorptive article, and water-sealing material |
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Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003326161A (ja) * | 2002-03-06 | 2003-11-18 | Nippon Shokubai Co Ltd | 吸水性樹脂の再生方法および吸水剤 |
JP2012219172A (ja) * | 2011-04-07 | 2012-11-12 | Mitsui Chemicals Inc | 吸水性ポリマーから得られる新規なポリマー並びにその用途 |
JP2013198862A (ja) | 2012-03-23 | 2013-10-03 | Hokkaido Univ | 使用済み高吸水性ポリマーの再生方法 |
JP2015120834A (ja) * | 2013-12-24 | 2015-07-02 | 株式会社リブドゥコーポレーション | 吸水性樹脂の処理方法 |
JP6771633B1 (ja) * | 2019-05-30 | 2020-10-21 | ユニ・チャーム株式会社 | 使用済み吸収性物品由来の高吸水性ポリマーを再生する方法及び使用済み吸収性物品由来のリサイクル高吸水性ポリマー |
Non-Patent Citations (1)
Title |
---|
See also references of EP4046706A4 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2023149576A1 (ja) * | 2022-02-04 | 2023-08-10 | 株式会社日本触媒 | リサイクル吸水性樹脂を含む吸水性樹脂の製造方法、およびその利用 |
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