CN107237197B - A kind of wood dissolving pulp deashing agent and process for deashing - Google Patents
A kind of wood dissolving pulp deashing agent and process for deashing Download PDFInfo
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- CN107237197B CN107237197B CN201710597684.1A CN201710597684A CN107237197B CN 107237197 B CN107237197 B CN 107237197B CN 201710597684 A CN201710597684 A CN 201710597684A CN 107237197 B CN107237197 B CN 107237197B
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- dissolving pulp
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- 229920000875 Dissolving pulp Polymers 0.000 title claims abstract description 110
- 238000000034 method Methods 0.000 title claims abstract description 37
- 230000008569 process Effects 0.000 title claims abstract description 35
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 26
- 239000002023 wood Substances 0.000 title claims description 16
- 239000002738 chelating agent Substances 0.000 claims abstract description 21
- 238000002156 mixing Methods 0.000 claims abstract description 21
- 230000000740 bleeding effect Effects 0.000 claims abstract description 16
- 239000002253 acid Substances 0.000 claims abstract description 7
- 239000013522 chelant Substances 0.000 claims abstract description 6
- 238000007667 floating Methods 0.000 claims abstract description 6
- 230000009920 chelation Effects 0.000 claims abstract description 3
- 230000008595 infiltration Effects 0.000 claims abstract description 3
- 238000001764 infiltration Methods 0.000 claims abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 24
- 241000219000 Populus Species 0.000 claims description 14
- 238000007789 sealing Methods 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 9
- 244000166124 Eucalyptus globulus Species 0.000 claims description 8
- 239000000654 additive Substances 0.000 claims description 8
- 230000000996 additive effect Effects 0.000 claims description 8
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 7
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 7
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 7
- 241000124033 Salix Species 0.000 claims description 7
- 239000011425 bamboo Substances 0.000 claims description 7
- 239000004033 plastic Substances 0.000 claims description 7
- 238000004821 distillation Methods 0.000 claims description 5
- 239000012153 distilled water Substances 0.000 claims description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical group OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 2
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 claims description 2
- UEUXEKPTXMALOB-UHFFFAOYSA-J tetrasodium;2-[2-[bis(carboxylatomethyl)amino]ethyl-(carboxylatomethyl)amino]acetate Chemical group [Na+].[Na+].[Na+].[Na+].[O-]C(=O)CN(CC([O-])=O)CCN(CC([O-])=O)CC([O-])=O UEUXEKPTXMALOB-UHFFFAOYSA-J 0.000 claims description 2
- 229920002472 Starch Polymers 0.000 claims 2
- 235000019698 starch Nutrition 0.000 claims 2
- 244000082204 Phyllostachys viridis Species 0.000 claims 1
- 239000008107 starch Substances 0.000 claims 1
- 238000006116 polymerization reaction Methods 0.000 abstract description 21
- 239000000835 fiber Substances 0.000 abstract description 5
- -1 silicate ion Chemical class 0.000 abstract description 5
- 230000009467 reduction Effects 0.000 abstract description 4
- 239000000126 substance Substances 0.000 abstract description 4
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 abstract description 3
- 235000012239 silicon dioxide Nutrition 0.000 abstract description 3
- 238000003916 acid precipitation Methods 0.000 abstract description 2
- 210000002421 cell wall Anatomy 0.000 abstract description 2
- 229910021645 metal ion Inorganic materials 0.000 abstract description 2
- 238000000926 separation method Methods 0.000 abstract description 2
- 229910001428 transition metal ion Inorganic materials 0.000 abstract description 2
- 239000002956 ash Substances 0.000 description 39
- 235000002918 Fraxinus excelsior Nutrition 0.000 description 19
- 241001330002 Bambuseae Species 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000706 filtrate Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229920000297 Rayon Polymers 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 238000004061 bleaching Methods 0.000 description 2
- 229920002678 cellulose Polymers 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 229920002488 Hemicellulose Polymers 0.000 description 1
- 240000007472 Leucaena leucocephala Species 0.000 description 1
- 235000010643 Leucaena leucocephala Nutrition 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- YZCKVEUIGOORGS-IGMARMGPSA-N Protium Chemical compound [1H] YZCKVEUIGOORGS-IGMARMGPSA-N 0.000 description 1
- 229920006221 acetate fiber Polymers 0.000 description 1
- 238000005903 acid hydrolysis reaction Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 210000000630 fibrocyte Anatomy 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 210000003734 kidney Anatomy 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000001936 parietal effect Effects 0.000 description 1
- 238000004076 pulp bleaching Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The present invention relates to the wooden dissolving pulp preparing technical field, more particularly to a kind of wooden dissolving pulp deashing agent, including bleeding agent, mixing acidizer and chelating agent.The wooden dissolving pulp process for deashing：Infiltration is handled；Mixed acid processing；Chelation treatment.The gap of the wooden dissolving pulp fiber finer cell wall and the interfacial tension at pit after floating are reduced by the bleeding agent in deashing agent, mixing acidizer and chelating agent are added again, chelate transitional metal ion, it is acidified silicate ion and generates silicic acid precipitation, idetified separation is carried out to silicate ion and transition metal ions, since sour dosage is low, the reduction of cellulosic degree of polymerization in the wooden dissolving pulp is avoided, to improve the removal rate of ash content and the reduction amplitude for reducing the wooden dissolving pulp average degree of polymerization in the wooden dissolving pulp.Technological process is simple, chemicals clean environment firendly used.
Description
Technical field
The present invention relates to the wooden dissolving pulp preparing technical field, more particularly to it is molten to further relate to wood for a kind of wooden dissolving pulp deashing agent
Solve the process for deashing of slurry.
Background technology
Dissolving pulp mainly as synthetic cotton, acetate fiber, enteric solubility coated tablet and medical artificial kidney etc. raw material,
One of the important source material of the industry such as modern light, spinning, medicine, chemical industry, military project is become.Currently, in the world to the need of dissolving pulp
The amount of asking is growing day by day, and dissolving pulp requires high content of cellulose, low hemicellulose, lignin, extract and content of ashes.
Ash content refers to residue of the dissolving pulp in 725 DEG C of Muffle furnaces after calcination, it be mainly silica and calcium, magnesium,
Copper, iron plasma, ash content height can make viscose filtration difficult, while iron, the copper plasma in ash content can accelerate alkali cellulose aging
It degrades, aging technique is caused to fluctuate, or even have an effect on viscose fiber strength and color and luster.The wooden dissolving pulp user is to ash content in dissolving pulp
Content has strict demand, and according to quality difference, content of ashes requires to be respectively to be less than 0.10%（725℃）With less than 0.12%（725
℃）.
Dissolving pulp mainly is prepared using timber such as poplar, Eucalyptus, Acacia, pines both at home and abroad, ash content in these raw materials
For content because place of production difference difference is larger, content is generally 0.3~0.9%, the inorganic brought into along with boiling and bleaching process
Chemicals, content of ashes increases to 1.0% or so in the wooden dissolving pulp after bleaching, this cannot be satisfied the wooden dissolving pulp user to dissolving pulp
The requirement of middle content of ashes.
In order to reduce the ash content of dissolving pulp, dissolving pulp manufacturing enterprise will carry out sour processing after association with pulp bleaching, generally at acid
It is relatively low to manage pH value control（PH=1-3), the time is longer (1-3 hours), and low pH value processing environment easily makes few fibers in dissolving pulp
Element occurs acidic hydrolysis and drops poly-, and the average degree of polymerization of dissolving pulp can reduce, this not only influences the reactivity worth of dissolving pulp, can also
Increase the washing water consumption of dissolving pulp after acid is handled.This technique is extremely difficult to 80% to the wooden dissolving pulp ash content removal rate after drift, wood
It is more than 5% that the average degree of polymerization of dissolving pulp, which reduces amplitude,.If it is efficient and to the average degree of polymerization of the wooden dissolving pulp to explore ash disposal
Small technology is influenced, it will be of great advantage to the wooden dissolving pulp manufacturing enterprise.
Invention content
Low in order to solve ash content removal rate in the above dissolving pulp, existing ash content minimizing technology is to dissolving pulp average degree of polymerization
Big problem is influenced, it is high that this application discloses ash content removal rates in a kind of dissolving pulp, is influenced on dissolving pulp average degree of polymerization small
The wooden dissolving pulp deashing agent.
Disclosed herein as well is a kind of wooden dissolving pulp process for deashing.
It is reduced after drift in the wooden dissolving pulp at fibrocyte parietal suture gap and pit by means of the bleeding agent in deashing agent first
Interfacial tension, by adsorption and diffusion chelating agent so far and hydrogen radical ion pair remain in the transition metal at gap and pit from
Son is chelated, and so that it is converted into silicic acid the progress acid modification of the silicate ion of remaining and be precipitated, and since sour dosage is low, is kept away
The reduction of cellulosic degree of polymerization in the wooden dissolving pulp is exempted from.After this process, the wooden dissolving pulp ash content removal rate is more than after drift
90%, the average degree of polymerization of the wooden dissolving pulp reduces amplitude and is less than 2%.
The present invention is achieved by the following measures：
A kind of wood dissolving pulp deashing agent, including bleeding agent, mixing acidizer and chelating agent, wherein
Bleeding agent is thermally coupled distillation columns, neopelex, OP-13 and OP-15 mass ratioes 2:
2:1:1 mixture；
Mixing acidizer is H2SO4, HCl and HAC mass ratioes be 2:2:1 mixture；
Chelating agent is EDETATE SODIUM and calgon mass ratio is 20:1 mixture.
A kind of wood dissolving pulp process for deashing, includes the following steps：
（1）Infiltration is handled:The wooden dissolving pulp is added in plastic sealing bag after floating, and bleeding agent is added, additive amount is oven dry stock
The 0.006-0.06% of quality, after being rubbed 1-5 minutes with hand, polybag is put into 20-40 DEG C of constant temperature by sealed plastic bag, when processing
Between 5-20min；
（2）Mixed acid processing：Mixing acidizer is added to by step（1）The wooden dissolving pulp after penetrant treating
In, mixing acidizer additive amount is the 0.25-1.5% of oven dry stock quality, after hand rubbing polybag 1-5 minutes, is moulded in sealing
Material bag, then polybag is put into 20-40 DEG C of constant temperature, processing time is 10-20 min；
（3）Chelation treatment：Chelating agent is added to by step（2）It mixes acidizer treated in the wooden dissolving pulp,
Amount of chelant is the 0.021-0.21% of oven dry stock quality, after hand rubbing polybag 1-5 minutes, polybag in sealing, then will
Polybag is put into 20-40 DEG C of constant temperature, and processing time is 20-40 min, is washed till neutrality.
The wooden dissolving pulp process for deashing, preferred steps（1）It is middle to adjust a concentration of 5-10% of the wooden dissolving pulp with distilled water.
The wooden dissolving pulp process for deashing, preferred steps（1）Middle bleeding agent additive amount is the 0.02- of oven dry stock quality
0.04%。
The wooden dissolving pulp process for deashing, preferred steps（2）Middle mixing acidizer additive amount is oven dry stock quality
0.7-0.9%。
The wooden dissolving pulp process for deashing, preferred steps（3）Middle amount of chelant is the 0.09- of oven dry stock quality
0.11%。
The wooden dissolving pulp process for deashing, the preferably wooden dissolving pulp is poplar slab dissolving pulp, bamboo willow dissolving pulp or Eucalyptus
Dissolving pulp.
It is analyzed by People's Republic of China (PRC) textile industry standard FZ/T 50010.3-2011 and FZ/T 50010.5-1998
The degree of polymerization and content of ashes of the wooden dissolving pulp of test.
The beneficial effects of the invention are as follows：
（1）It is reduced after drift at the gap of the wooden dissolving pulp fiber finer cell wall and pit by bleeding agent in deashing agent first
Interfacial tension, then mixing acidizer and chelating agent are added, chelate transitional metal ion is acidified silicate ion and generates silicic acid
Precipitation carries out idetified separation to silicate ion and transition metal ions and avoids fiber in the wooden dissolving pulp since sour dosage is low
The reduction of the plain degree of polymerization, to improve the removal rate of ash content and the drop for reducing the wooden dissolving pulp average degree of polymerization in the wooden dissolving pulp
Low amplitude.
（2）Using process wood dissolving pulp of the present invention, technological process is simple, chemicals clean environment firendly used.
Specific implementation mode
In order to better understand the present invention, it is further illustrated with reference to specific example.
Embodiment 1：
Poplar slab dissolving pulp after floating is handled using present invention process, the average degree of polymerization of poplar slab dissolving pulp is 490,
Whiteness 81%ISO, content of ashes 0.77%.
Step 1 is：Over dry poplar slab dissolving pulp 15g is taken, it is 0.02% that bleeding agent, which optimizes dosage, is adjusted with distilled water
Slurry concentration is 8%, and after being rubbed 1 minute with hand, polybag is put into constant temperature water bath, controls water bath with thermostatic control by sealed plastic bag
Bath temperature degree T=30 DEG C, processing time are 10 min；
Step 2 is：It will mix in the wooden dissolving pulp after acidizer is added to penetrant treating, mixing acidizer is excellent
It is 0.9% to change dosage, after hand rubbing polybag 1 minute, polybag in sealing, then polybag is put into constant temperature water bath, it controls
Constant temperature water bath temperature processed T=30 DEG C, processing time are 15 min；
Step 3 is：Chelating agent is added to mixing acidizer treated in the wooden dissolving pulp, chelating agent optimizes dosage
It is 0.09%, after hand rubbing polybag 1 minute, polybag in sealing, then polybag is put into constant temperature water bath, control constant temperature
Water bath temperature T=30 DEG C, processing time are that 30 min. are washed to filtrate with distillation and are in neutrality after chelating agent processing.By above-mentioned
After process, the average degree of polymerization of poplar slab dissolving pulp is 488, whiteness 83%ISO, content of ashes 0.04%.
After this process, poplar slab dissolving pulp ash content index can fully meet user and contain to ash content in dissolving pulp
The requirement of amount.
Embodiment 2：
Bamboo willow dissolving pulp after floating is handled using present invention process, the average degree of polymerization of bamboo willow dissolving pulp is 513, whiteness 85%
ISO, content of ashes 0.87%.
Step 1 is：Over dry bamboo willow dissolving pulp 15g is taken, it is 0.03% that bleeding agent, which optimizes dosage, and it is dense to adjust slurry with distilled water
Degree is 8%, and after being rubbed 1 minute with hand, polybag is put into constant temperature water bath, control constant temperature water bath temperature T by sealed plastic bag
=30 DEG C, processing time is 10 min；
Step 2 is：It will mix in the wooden dissolving pulp after acidizer is added to penetrant treating, mixing acidizer is excellent
It is 0.8% to change dosage, after hand rubbing polybag 1 minute, polybag in sealing, then polybag is put into constant temperature water bath, it controls
Constant temperature water bath temperature processed T=30 DEG C, processing time are 15 min；
Step 3 is：Chelating agent is added to mixing acidizer treated in the wooden dissolving pulp, chelating agent optimizes dosage
It is 0.10%, after hand rubbing polybag 1 minute, polybag in sealing, then polybag is put into constant temperature water bath, control constant temperature
Water bath temperature T=30 DEG C, processing time are that 30 min. are washed to filtrate with distillation and are in neutrality after chelating agent processing.By above-mentioned
After process, the average degree of polymerization of bamboo willow dissolving pulp is 510, whiteness 87%ISO, content of ashes 0.05%.
After this process, bamboo willow dissolving pulp ash content index can fully meet user to content of ashes in dissolving pulp
It is required that.
Embodiment 3：
Eucalyptus dissolving pulp after floating is handled using present invention process, the average degree of polymerization of eucalyptus dissolving pulp is 713, whiteness 86%
ISO, content of ashes 0.57%.
Step 1 is：Over dry eucalyptus dissolving pulp 15g is taken, it is 0.04% that bleeding agent, which optimizes dosage, and slurry is adjusted with distilled water
A concentration of 8%, after being rubbed 1 minute with hand, polybag is put into constant temperature water bath, controls water bath with thermostatic control bath temperature by sealed plastic bag
T=30 DEG C are spent, processing time is 10 min；
Step 2 is：It will mix in the wooden dissolving pulp after acidizer is added to penetrant treating, mixing acidizer is excellent
It is 0.7% to change dosage, after hand rubbing polybag 1 minute, polybag in sealing, then polybag is put into constant temperature water bath, it controls
Constant temperature water bath temperature processed T=30 DEG C, processing time are 15 min；
Step 3 is：Chelating agent is added to mixing acidizer treated in the wooden dissolving pulp, chelating agent optimizes dosage
It is 0.11%, after hand rubbing polybag 1 minute, polybag in sealing, then polybag is put into constant temperature water bath, control constant temperature
Water bath temperature T=30 DEG C, processing time are that 30 min. are washed to filtrate with distillation and are in neutrality after chelating agent processing.By above-mentioned
After process, the average degree of polymerization of eucalyptus dissolving pulp is 713, whiteness 88%ISO, content of ashes 0.03%.
After this process, eucalyptus dissolving pulp ash content index can fully meet user to content of ashes in dissolving pulp
It is required that.
Embodiment 4：
Compared with example 1, the penetrant treating operation in step 1 is omitted, remaining operation is identical with embodiment 1, as a result
For:The average degree of polymerization of poplar slab dissolving pulp is 488, whiteness 83%ISO, content of ashes 0.14%.
After this process, poplar slab dissolving pulp ash content index cannot meet user to content of ashes in dissolving pulp
Requirement.
Embodiment 5：
Compared with example 1, the mixed acid processing operation in step 2 is omitted, remaining operation is identical with embodiment 1, as a result
For:The average degree of polymerization of poplar slab dissolving pulp is 490, whiteness 81%ISO, content of ashes 0.16%.
After this process, poplar slab dissolving pulp ash content index cannot meet user to content of ashes in dissolving pulp
Requirement.
Embodiment 6：
Compared with example 1, the chelating agent operation processing step in step 3 is omitted, remaining operation is identical with embodiment 1,
As a result it is:The average degree of polymerization of poplar slab dissolving pulp is 487, whiteness 81%ISO, content of ashes 0.15%.
After this process, poplar slab dissolving pulp ash content index cannot meet user to content of ashes in dissolving pulp
Requirement.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not limited by embodiment
System, other any changes made without departing from the spirit and principles of the present invention, modification, combination, replacement, simplification should be
Equivalence replacement mode, is included within the scope of the present invention.
Claims (8)
1. a kind of wood dissolving pulp deashing agent, it is characterised in that including bleeding agent, mixing acidizer and chelating agent, wherein
Bleeding agent is thermally coupled distillation columns, neopelex, OP-13 and OP-15 mass ratioes 2:2:1:1
Mixture；
Mixing acidizer is H2SO4, HCl and HAc mass ratioes be 2:2:1 mixture；
Chelating agent is EDETATE SODIUM and calgon mass ratio is 20:1 mixture.
2. a kind of wood dissolving pulp process for deashing, it is characterised in that include the following steps：
（1）Infiltration is handled:The wooden dissolving pulp is added in plastic sealing bag after floating, and the bleeding agent described in claim 1 is added, adds
Dosage is the 0.006-0.06% of oven dry stock quality, and after being rubbed 1-5 minutes with hand, polybag is put into constant temperature by sealed plastic bag
20-40 DEG C, processing time 5-20min；
（2）Mixed acid processing：Mixing acidizer described in claim 1 is added to by step（1）Penetrant treating
In the wooden dissolving pulp afterwards, mixing acidizer additive amount is the 0.25-1.5% of oven dry stock quality, is divided with hand rubbing polybag 1-5
Zhong Hou, polybag in sealing, then polybag is put into 20-40 DEG C of constant temperature, processing time is 10-20 min；
（3）Chelation treatment：Chelating agent described in claim 1 is added to by step（2）After mixing acidizer processing
The wooden dissolving pulp in, amount of chelant is the 0.021-0.21% of oven dry stock quality, after hand rubbing polybag 1-5 minute, is sealed
Upper polybag, then polybag is put into 20-40 DEG C of constant temperature, processing time is 20-40 min, is washed till neutrality.
3. wood dissolving pulp process for deashing according to claim 2, it is characterised in that step（1）It is middle molten with distilled water adjusting wood
Solution starches a concentration of 5-10%.
4. wood dissolving pulp process for deashing according to claim 2, it is characterised in that step（1）Middle bleeding agent additive amount is exhausted
The 0.02-0.04% of dry pulp quality.
5. wood dissolving pulp process for deashing according to claim 2, it is characterised in that step（2）Middle mixing acidizer addition
Amount is the 0.7-0.9% of oven dry stock quality.
6. wood dissolving pulp process for deashing according to claim 2, it is characterised in that step（3）Middle amount of chelant is over dry
Starch the 0.09-0.11% of quality.
7. wood dissolving pulp process for deashing according to claim 2, it is characterised in that the wooden dissolving pulp be poplar slab dissolving pulp,
Bamboo willow dissolving pulp or eucalyptus dissolving pulp.
8. wood dissolving pulp process for deashing according to claim 2, it is characterised in that step（1）Middle bleeding agent additive amount is exhausted
The 0.03% of dry pulp quality, step（2）Middle mixing acidizer additive amount is the 0.8% of oven dry stock quality, step（3）Middle chelating agent
Dosage is the 0.10% of oven dry stock quality.
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|---|---|---|---|---|
| US6706143B1 (en) * | 1996-03-19 | 2004-03-16 | International Paper Company | Minimizing chlorinated organics in pulp bleaching processes |
| CN101748631A (en) * | 2009-12-18 | 2010-06-23 | 华南理工大学 | Efficient and clean puling and bleaching method dissolving alpha-pulp by Chinese alpine rush |
| CN102108646A (en) * | 2010-12-17 | 2011-06-29 | 山东轻工业学院 | Process for purifying dissolving pulp |
| CN102277762A (en) * | 2011-09-02 | 2011-12-14 | 山东轻工业学院 | Process for producing dissolving pulp by utilizing bleaching wood pulp board |
| CN103382671A (en) * | 2013-07-29 | 2013-11-06 | 四川理工学院 | Clean pulping technology for high-polymerization-degree bamboo pulp |
| CN103726377A (en) * | 2014-01-21 | 2014-04-16 | 四川理工学院 | Clean pulping method for low-polymerization degree bamboo pulp |
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