JP5231804B2 - 製紙方法 - Google Patents
製紙方法 Download PDFInfo
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- JP5231804B2 JP5231804B2 JP2007522193A JP2007522193A JP5231804B2 JP 5231804 B2 JP5231804 B2 JP 5231804B2 JP 2007522193 A JP2007522193 A JP 2007522193A JP 2007522193 A JP2007522193 A JP 2007522193A JP 5231804 B2 JP5231804 B2 JP 5231804B2
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- sodium hypochlorite
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- 238000000034 method Methods 0.000 title claims description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 78
- 239000007864 aqueous solution Substances 0.000 claims description 62
- 239000005708 Sodium hypochlorite Substances 0.000 claims description 53
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 claims description 53
- 239000000460 chlorine Substances 0.000 claims description 34
- 229910052801 chlorine Inorganic materials 0.000 claims description 34
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 30
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 28
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 claims description 3
- 239000000243 solution Substances 0.000 claims 2
- 239000000123 paper Substances 0.000 description 34
- 238000004061 bleaching Methods 0.000 description 29
- QWPPOHNGKGFGJK-UHFFFAOYSA-N hypochlorous acid Chemical compound ClO QWPPOHNGKGFGJK-UHFFFAOYSA-N 0.000 description 20
- 230000008569 process Effects 0.000 description 20
- 239000000126 substance Substances 0.000 description 20
- 238000012545 processing Methods 0.000 description 16
- QBWCMBCROVPCKQ-UHFFFAOYSA-N chlorous acid Chemical compound OCl=O QBWCMBCROVPCKQ-UHFFFAOYSA-N 0.000 description 15
- 229940077239 chlorous acid Drugs 0.000 description 14
- 230000002378 acidificating effect Effects 0.000 description 13
- 239000002351 wastewater Substances 0.000 description 13
- 239000010893 paper waste Substances 0.000 description 11
- 239000003795 chemical substances by application Substances 0.000 description 10
- 239000003242 anti bacterial agent Substances 0.000 description 9
- 150000001450 anions Chemical class 0.000 description 8
- 230000001877 deodorizing effect Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- 239000010813 municipal solid waste Substances 0.000 description 8
- 239000010802 sludge Substances 0.000 description 7
- 230000000844 anti-bacterial effect Effects 0.000 description 6
- 239000003638 chemical reducing agent Substances 0.000 description 6
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Chemical compound Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 description 6
- 239000011941 photocatalyst Substances 0.000 description 6
- 239000002994 raw material Substances 0.000 description 6
- 241000894006 Bacteria Species 0.000 description 5
- 239000002761 deinking Substances 0.000 description 5
- 239000008235 industrial water Substances 0.000 description 5
- 239000007800 oxidant agent Substances 0.000 description 5
- 230000001590 oxidative effect Effects 0.000 description 5
- 238000003860 storage Methods 0.000 description 5
- 239000008399 tap water Substances 0.000 description 5
- 235000020679 tap water Nutrition 0.000 description 5
- 239000002253 acid Substances 0.000 description 4
- 239000000356 contaminant Substances 0.000 description 4
- 238000011109 contamination Methods 0.000 description 4
- NFMHSPWHNQRFNR-UHFFFAOYSA-N hyponitrous acid Chemical compound ON=NO NFMHSPWHNQRFNR-UHFFFAOYSA-N 0.000 description 4
- 238000007726 management method Methods 0.000 description 4
- 239000003595 mist Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 230000001954 sterilising effect Effects 0.000 description 4
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000032683 aging Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 3
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000000813 microbial effect Effects 0.000 description 3
- 239000005416 organic matter Substances 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 230000000717 retained effect Effects 0.000 description 3
- UKLNMMHNWFDKNT-UHFFFAOYSA-M sodium chlorite Chemical compound [Na+].[O-]Cl=O UKLNMMHNWFDKNT-UHFFFAOYSA-M 0.000 description 3
- 229960002218 sodium chlorite Drugs 0.000 description 3
- 238000004659 sterilization and disinfection Methods 0.000 description 3
- 229920001131 Pulp (paper) Polymers 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- DKSMCEUSSQTGBK-UHFFFAOYSA-M bromite Chemical compound [O-]Br=O DKSMCEUSSQTGBK-UHFFFAOYSA-M 0.000 description 2
- 238000011088 calibration curve Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 229940079593 drug Drugs 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- JGJLWPGRMCADHB-UHFFFAOYSA-N hypobromite Chemical compound Br[O-] JGJLWPGRMCADHB-UHFFFAOYSA-N 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000005342 ion exchange Methods 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- 239000004816 latex Substances 0.000 description 2
- 229920000126 latex Polymers 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 238000006386 neutralization reaction Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- BZSXEZOLBIJVQK-UHFFFAOYSA-N 2-methylsulfonylbenzoic acid Chemical compound CS(=O)(=O)C1=CC=CC=C1C(O)=O BZSXEZOLBIJVQK-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 239000004155 Chlorine dioxide Substances 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 240000001931 Ludwigia octovalvis Species 0.000 description 1
- LSDPWZHWYPCBBB-UHFFFAOYSA-N Methanethiol Chemical compound SC LSDPWZHWYPCBBB-UHFFFAOYSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000007844 bleaching agent Substances 0.000 description 1
- DKSMCEUSSQTGBK-UHFFFAOYSA-N bromous acid Chemical compound OBr=O DKSMCEUSSQTGBK-UHFFFAOYSA-N 0.000 description 1
- GBAOBIBJACZTNA-UHFFFAOYSA-L calcium sulfite Chemical compound [Ca+2].[O-]S([O-])=O GBAOBIBJACZTNA-UHFFFAOYSA-L 0.000 description 1
- 235000010261 calcium sulphite Nutrition 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- XTEGARKTQYYJKE-UHFFFAOYSA-N chloric acid Chemical compound OCl(=O)=O XTEGARKTQYYJKE-UHFFFAOYSA-N 0.000 description 1
- 229940005991 chloric acid Drugs 0.000 description 1
- 239000012320 chlorinating reagent Substances 0.000 description 1
- 235000019398 chlorine dioxide Nutrition 0.000 description 1
- 229910001919 chlorite Inorganic materials 0.000 description 1
- 229910052619 chlorite group Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 239000003623 enhancer Substances 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000002655 kraft paper Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
- 238000006864 oxidative decomposition reaction Methods 0.000 description 1
- 239000003002 pH adjusting agent Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 229910000028 potassium bicarbonate Inorganic materials 0.000 description 1
- 235000015497 potassium bicarbonate Nutrition 0.000 description 1
- 239000011736 potassium bicarbonate Substances 0.000 description 1
- TYJJADVDDVDEDZ-UHFFFAOYSA-M potassium hydrogencarbonate Chemical compound [K+].OC([O-])=O TYJJADVDDVDEDZ-UHFFFAOYSA-M 0.000 description 1
- 239000012286 potassium permanganate Substances 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 238000004076 pulp bleaching Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012552 review Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- PKIJMLKOTJOFDG-UHFFFAOYSA-N sodium hypochlorite hydrochloride Chemical compound [Na+].Cl.[O-]Cl PKIJMLKOTJOFDG-UHFFFAOYSA-N 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 235000010265 sodium sulphite Nutrition 0.000 description 1
- NYCVSSWORUBFET-UHFFFAOYSA-M sodium;bromite Chemical compound [Na+].[O-]Br=O NYCVSSWORUBFET-UHFFFAOYSA-M 0.000 description 1
- CRWJEUDFKNYSBX-UHFFFAOYSA-N sodium;hypobromite Chemical compound [Na+].Br[O-] CRWJEUDFKNYSBX-UHFFFAOYSA-N 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
- D21C5/02—Working-up waste paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
- D21H17/11—Halides
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/26—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof
- C02F2103/28—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof from the paper or cellulose industry
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/29—Chlorine compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/10—Bleaching ; Apparatus therefor
- D21C9/12—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/10—Bleaching ; Apparatus therefor
- D21C9/12—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds
- D21C9/14—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds with ClO2 or chlorites
-
- 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
- Y02W30/64—Paper recycling
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Paper (AREA)
Description
(1).強力な殺菌効果を発揮し、スライムコントロール剤を不要とする。因みに、白水循環系内の残留塩素濃度を0.1以上3、多くとも5ppmに維持することにより古紙使用抄紙の場合に菌数104以下に抑制することができる。
(2).セルロ−スに帯電するマイナスイオンを中性化させ、紙力増強剤の使用料を20〜35%減少させる。
(3).ビニ−ル、アクリル系を始めとする化合物のエステル部分を次亜水の酸化力により分解するので、ピッチコント−ル剤の使用料が20から30%減少する。
(4).有機物の分解および種々の夾雑物によるアニオントラッシュの影響を除去または減少させ、トラブル処理に添加される薬剤効果を最大限に引き上げることができる。
(5).硫化水素などの有機物臭気を完全に分解するので、消臭効果が高い。有機物の分解により排水CODを減少させることができる。
(6).次亜塩素酸ソーダを代表とする酸塩素系酸化剤を使用することにより排水を更に処理することにより工業用水として再利用することができる。
(7).抄紙前の、脱リグニン後または脱墨後の製紙原料水を次亜塩素酸ソーダを代表とする酸塩素系酸化剤で漂白することにより、上記(1)〜(6)の効果を更に向上させることができるだけでなく、製紙工程全体における薬剤処理を極めて簡略化することができる。
(8).弱酸性pHに調整された次亜塩素酸または亜塩素酸を含む水溶液を連続又は断続的に投入する前後の酸化還元電位を好ましくはpHとともに測定することにより、製紙工程の薬剤管理を一元管理することを可能とする。
図1は古紙原料使用抄紙工程の白水循環ラインにおけるウエットエンド環境野制御システムの概略図で、抄紙マシン100で抄紙された白水は一旦白水ピット110に送られ、ここでスライム処理が行われ、一部はストックインレット150に再循環され、一部は排水ピット120に送られる。他方、原料のパルパーは脱墨工程槽160から種箱140に送られ、スクリ−ン槽130を経て、ストックインレット150に送られ、抄紙マシン100に至る。ここでは、1台の抄紙マシン100に1槽の白水ピット110が図示されているが、通常抄紙マシン100が4台直列され、各マシンに各白水ピット110が(a),(b),(c),(d)槽が設けられる。
使用古紙種:オフィスから回収したオフィス古紙(上質古紙、中質古紙が混合している)を使用し、抄紙前に以下の漂白処理を施した。
分析評価・白色度:JIS−P8123(ハンター白色度法)
・残存インク量:顕微鏡(10倍)、画像解析装置(ピアス社製LA−525)を使用して一定視野中のインクの面積を割合(%)で表した。
実施例2と同様にアルカリ離解、脱水、熟成、除塵、洗浄、脱水を行って、パルプ濃度15%にした。次に薬液ミキサーを使用し、次亜塩素酸ソーダをミキシングし、洗浄を行った。結果を表1に示す。
白色度(%) 残インキ量(%)
実施例 183.1 0.002
比較例 173.8 0.36
本発明の方法は、アルカリ離解後、次亜塩素酸塩漂白をアルカリ性で行う方法に比べ、大幅な白色度向上が得られた。
アルカリ酸素漂白後クラフトパルプ(白色度47.2%、カッパー価9.9)の絶乾質量80.0gをプラスチック袋に入れ、イオン交換水を用いてパルプ濃度を10%に調整した後、pH4.5、10000ppmの次亜塩素酸ソーダ水溶液を添加し、室温で60分間浸漬して初段の漂白を行なった。得られたパルプをイオン交換水で3%に希釈した後、ブフナーロートで脱水、洗浄した。このパルプをプラスチック袋に入れ、イオン交換水を用いてパルプ濃度を10%に調整した後、pH5、3000ppmの次亜塩素酸ソーダ水溶液を添加し、室温で90分間処理し、次段漂白を行なった。得られたパルプをイオン交換水で希釈してパルプ濃度を3%に調整した後、ブフナーロートを用いてパルプマットを形成し、シリンダープレス機で脱水し、パルプ(濃度30.0%)を得た。
次亜塩素酸を次亜塩素酸ナトリウムとした以外は実施例2と同様の操作を行なった。次亜塩素酸ナトリウム処理後のパルプは十分に漂白されず、白色度はよくなかった。
図4は古紙再生製紙フローシートで、白水槽、スカム回収槽およびパルパー槽にpH5〜6で3000ppmの次亜塩素酸ソーダ水溶液を水量を考慮して投入し、白水槽、ステム回収槽は20〜30ppmになるように、パルパー槽は10〜5ppmになるように調整する。
図5ないし図7は本発明の製紙工場設備における脱臭方法の好ましい実施形態を模式的に示す。図において、次亜塩素酸貯蔵タンク410内には例えば12%の次亜塩素酸ソーダ水溶液が貯蔵され、希塩酸貯蔵タンク411には例えば9%の希塩酸が貯蔵されている。これら貯蔵タンク410、411内の次亜塩素酸ソーダ水溶液及び希塩酸は送給パイプ414、415及びポンプ412、413によって 濃度次亜塩素酸ソーダ水溶液製造装置420内のサブタンク421、422に送給されている。
110、120 白水ピット
200 次亜水供給制御システム
Claims (4)
- 白水循環系で抄紙するに当たり、現場で希塩酸と次亜塩素酸ソーダ水溶液を希釈混合して塩素ガスが発生しないようにpH4以上pH6.5以下で1000〜10000ppmの次亜塩素酸ソーダ水溶液を調製し、これを続いて白水ピット槽に連続供給して白水中の残留塩素濃度を0.1ppm〜3ppmにコントロールすることを特徴とする製紙方法。
- 前記次亜塩素酸ナトリウム水溶液の有効塩素濃度が3,000〜10,000ppmである請求項1記載の製紙方法。
- 前記次亜塩素酸ナトリウム水溶液のpHが5以上6以下である請求項1記載の製紙方法。
- 前記白水中のpHを測定する請求項1記載の製紙方法。
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JP5262566B2 (ja) * | 2008-10-21 | 2013-08-14 | 栗田工業株式会社 | 紙の製造方法 |
JP5357524B2 (ja) * | 2008-12-03 | 2013-12-04 | ソマール株式会社 | 製紙工程におけるスライムコントロール方法 |
CN101838945B (zh) * | 2010-06-23 | 2012-11-07 | 永州湘江纸业有限责任公司 | 在一种造纸废水循环利用方法 |
CN103370471B (zh) * | 2010-11-25 | 2016-01-06 | 栗田工业株式会社 | 制造纸的方法 |
JP2012152510A (ja) * | 2011-01-28 | 2012-08-16 | Tech Corporation:Kk | 小型古紙再生装置における洗浄水及び被洗浄物の除菌方法 |
US8613837B2 (en) * | 2012-01-24 | 2013-12-24 | Nalco Company | Detection and quantification of nucleic acid to assess microbial biomass in paper defects and machine felts |
US8715466B1 (en) * | 2012-10-19 | 2014-05-06 | Theodore Caouette | Method and system for reducing water loss in a paper mill |
JP5952230B2 (ja) * | 2013-07-09 | 2016-07-13 | 大王製紙株式会社 | スライム抑制方法 |
CN105378178B (zh) * | 2013-07-09 | 2017-07-11 | 栗田工业株式会社 | 腐浆抑制方法 |
JP6002095B2 (ja) * | 2013-07-09 | 2016-10-05 | 大王製紙株式会社 | スライム抑制方法 |
JP6277009B2 (ja) * | 2014-02-13 | 2018-02-07 | ソマール株式会社 | スライムコントロール剤の添加方法 |
KR20180054631A (ko) * | 2015-09-16 | 2018-05-24 | 프리키라 파마슈티컬 인코포레이티드 | 하이포아염소산 수용액 |
CN105651972A (zh) * | 2016-04-07 | 2016-06-08 | 恒安(芜湖)纸业有限公司 | 一种造纸产线pH值在线检测装置 |
JP6933237B2 (ja) * | 2019-11-12 | 2021-09-08 | 栗田工業株式会社 | 懸濁物質の堆積抑制方法、ピッチ障害の抑制方法および懸濁物質の堆積検出方法 |
JP6939949B1 (ja) * | 2020-05-22 | 2021-09-22 | 栗田工業株式会社 | 水槽内における硫化水素発生抑制方法 |
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WO2006137183A1 (ja) | 2006-12-28 |
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