CN107237197A - A kind of wooden dissolving pulp deashing agent and process for deashing - Google Patents
A kind of wooden dissolving pulp deashing agent and process for deashing Download PDFInfo
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- CN107237197A CN107237197A CN201710597684.1A CN201710597684A CN107237197A CN 107237197 A CN107237197 A CN 107237197A CN 201710597684 A CN201710597684 A CN 201710597684A CN 107237197 A CN107237197 A CN 107237197A
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- dissolving pulp
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- acidizer
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- 229920000875 Dissolving pulp Polymers 0.000 title claims abstract description 110
- 238000000034 method Methods 0.000 title claims abstract description 35
- 230000008569 process Effects 0.000 title claims abstract description 32
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 25
- 238000002156 mixing Methods 0.000 claims abstract description 23
- 239000002738 chelating agent Substances 0.000 claims abstract description 22
- 230000000740 bleeding effect Effects 0.000 claims abstract description 16
- 238000010306 acid treatment Methods 0.000 claims abstract description 6
- 239000013522 chelant Substances 0.000 claims abstract description 5
- 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
- 239000000203 mixture Substances 0.000 claims description 11
- 238000007789 sealing Methods 0.000 claims description 11
- 244000166124 Eucalyptus globulus Species 0.000 claims description 8
- 239000004033 plastic Substances 0.000 claims description 8
- 229920003023 plastic Polymers 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
- 238000004821 distillation Methods 0.000 claims description 5
- 239000012153 distilled water Substances 0.000 claims description 5
- 239000002002 slurry 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
- 238000007667 floating Methods 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
- 244000082204 Phyllostachys viridis Species 0.000 claims 1
- 229920002472 Starch Polymers 0.000 claims 1
- 235000019698 starch Nutrition 0.000 claims 1
- 239000008107 starch Substances 0.000 claims 1
- 238000006116 polymerization reaction Methods 0.000 abstract description 21
- 230000009467 reduction Effects 0.000 abstract description 8
- -1 silicate ion Chemical class 0.000 abstract description 5
- 239000000835 fiber 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
- 239000000126 substance Substances 0.000 abstract description 3
- 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
- 238000003916 acid precipitation Methods 0.000 abstract 1
- 239000002956 ash Substances 0.000 description 38
- 235000002918 Fraxinus excelsior Nutrition 0.000 description 19
- 238000005457 optimization Methods 0.000 description 9
- 241001330002 Bambuseae Species 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229920002678 cellulose Polymers 0.000 description 3
- 239000001913 cellulose Substances 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
- 239000002253 acid Substances 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 238000004061 bleaching Methods 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
- 239000002994 raw material Substances 0.000 description 2
- 239000002023 wood 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
- 230000008859 change Effects 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
- 239000000686 essence Substances 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
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001936 parietal effect Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000004076 pulp bleaching Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 239000013049 sediment 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 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.Wooden dissolving pulp process for deashing：Infiltration is handled；Mix acid treatment；Chelation treatment.Pass through the interfacial tension at the gap of wooden dissolving pulp fiber finer cell wall after the bleeding agent reduction drift in deashing agent and pit, 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, because sour consumption is low, it is to avoid the reduction of cellulosic degree of polymerization in wooden dissolving pulp, so as to improve in wooden dissolving pulp the clearance of ash content and reduce the reduction amplitude of wooden dissolving pulp average degree of polymerization.Technological process is simple, chemicals clean environment firendly used.
Description
Technical field
The present invention relates to wooden dissolving pulp preparing technical field, more particularly to a kind of wooden dissolving pulp deashing agent further relates to wooden dissolving pulp
Process for deashing.
Background technology
Dissolving pulp mainly as synthetic cotton, acetate fiber, enteric solubility coated tablet and medical artificial kidney etc. raw material,
One of important source material as the industry such as modern light, spinning, medicine, chemical industry, military project.At present, demand in the world to dissolving pulp
Growing day by day, 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 the iron, copper plasma in ash content can accelerate alkali cellulose aging
Degrade, cause aging technique to fluctuate, or even have an effect on viscose fiber strength and color and luster.Wooden dissolving pulp user is to ash content in dissolving pulp
Content has strict demand, different according to quality, and content of ashes requirement is 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, content of ashes in these raw materials
Because the different difference in the place of production are larger, content is generally 0.3~0.9%, the inorganic chemistry brought into along with boiling and bleaching process
Product, content of ashes increases to 1.0% or so in wooden dissolving pulp after bleaching, and this can not meet wooden dissolving pulp user to grey in dissolving pulp
Divide the requirement of content.
In order to reduce the ash content of dissolving pulp, dissolving pulp manufacturing enterprise will carry out acid treatment after association with pulp bleaching, at general acid
Manage pH value control relatively low（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 be reduced, and this not only influences the reactivity worth of dissolving pulp, can also
Increase the washing water consumption of dissolving pulp after acid treatment.This technique is extremely difficult to 80%, wood to wooden dissolving pulp ash content clearance after drift
The average degree of polymerization of dissolving pulp reduces amplitude more than 5%.If average degree of polymerization of the ash disposal efficiency high again to wooden dissolving pulp can be explored
The small technology of influence, will be of great advantage to wooden dissolving pulp manufacturing enterprise.
The content of the invention
Low in order to solve ash content clearance in above dissolving pulp, existing ash content minimizing technology influences on dissolving pulp average degree of polymerization
Big the problem of, high this application discloses ash content clearance in a kind of dissolving pulp, small on the influence of dissolving pulp average degree of polymerization is wooden molten
Solution slurry deashing agent.
Disclosed herein as well is a kind of wooden dissolving pulp process for deashing.
Reduced first by means of the bleeding agent in deashing agent after drift in wooden dissolving pulp at fibrocyte parietal suture gap and pit
Interfacial tension, the transition metal remained at gap and pit by adsorption and diffusion chelating agent so far and hydrogen radical ion pair from
Son is chelated, and carries out acid to the silicate ion of remaining and be modified making it be converted into silicic acid and separating out, and because sour consumption is low, is kept away
The reduction of cellulosic degree of polymerization in wooden dissolving pulp is exempted from.After this PROCESS FOR TREATMENT, wooden dissolving pulp ash content clearance exceedes after drift
90%, the average degree of polymerization reduction amplitude of wooden dissolving pulp is less than 2%.
The present invention is achieved by the following measures：
A kind of wooden 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 wooden dissolving pulp process for deashing, comprises the following steps：
（1）Infiltration is handled:Wooden dissolving pulp is added in plastic sealing bag after floating, and adds bleeding agent, and addition is oven dry stock quality
0.006-0.06%, rubbed with hand after 1-5 minutes, sealed plastic bag, polybag be put into 20-40 DEG C of constant temperature, processing time 5-
20min；
（2）Mix acid treatment：Mixing acidizer is added to by step（1）In wooden dissolving pulp after penetrant treating, mix
The 0.25-1.5% that acidizer addition is oven dry stock quality is closed, after rubbing polybag 1-5 minutes with hand, polybag in sealing,
Polybag is put into 20-40 DEG C of constant temperature again, processing time is 10-20 min；
（3）Chelation treatment：Chelating agent is added to by step（2）Mix in the wooden dissolving pulp after acidizer processing, chelating
Agent consumption is the 0.021-0.21% of oven dry stock quality, after rubbing polybag 1-5 minutes with hand, polybag in sealing, then by plastics
Bag is put into 20-40 DEG C of constant temperature, and processing time is 20-40 min, is washed till neutrality.
Described wooden dissolving pulp process for deashing, preferred steps（1）The middle wood dissolving pulp concentration that adjusted with distilled water is 5-10%.
Described wooden dissolving pulp process for deashing, preferred steps（1）Middle bleeding agent addition is the 0.02- of oven dry stock quality
0.04%。
Described wooden dissolving pulp process for deashing, preferred steps（2）Middle mixing acidizer addition is oven dry stock quality
0.7-0.9%。
Described wooden dissolving pulp process for deashing, preferred steps（3）Middle amount of chelant is the 0.09- of oven dry stock quality
0.11%。
Described wooden dissolving pulp process for deashing, preferably wooden dissolving pulp is poplar slab dissolving pulp, bamboo willow dissolving pulp or Eucalyptus
Dissolving pulp.
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）Pass through the interface at the gap of wooden dissolving pulp fiber finer cell wall after the bleeding agent reduction drift in deashing agent and pit first
Tension force, then mixing acidizer and chelating agent are added, chelate transitional metal ion is acidified silicate ion and generates silicic acid and sink
Form sediment, idetified separation is carried out to silicate ion and transition metal ions, because sour consumption is low, it is to avoid cellulose in wooden dissolving pulp
The reduction of the degree of polymerization, so as to improve in wooden dissolving pulp the clearance of ash content and reduce the reduction of wooden dissolving pulp average degree of polymerization
Amplitude.
（2）Using the wooden dissolving pulp of PROCESS FOR TREATMENT of the present invention, technological process is simple, chemicals clean environment firendly used.
Embodiment
In order to be better understood from the present invention, further illustrated with reference to instantiation.
Embodiment 1：
Poplar slab dissolving pulp after drift 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 one is：Over dry poplar slab dissolving pulp 15g is taken, bleeding agent optimization consumption is 0.02%, is adjusted with distilled water
Slurry concentration is 8%, is rubbed with hand after 1 minute, sealed plastic bag, and polybag is put into constant temperature water bath, controls water bath with thermostatic control
Bath temperature degree T=30 DEG C, processing time is 10 min；
Step 2 is：Mixing acidizer is added in the wooden dissolving pulp after penetrant treating, mixing acidizer optimization is used
Measure as 0.9%, after rubbing polybag 1 minute with hand, polybag in sealing, then polybag is put into constant temperature water bath, control is permanent
Warm water bath temperature T=30 DEG C, processing time is 15 min；
Step 3 is：Chelating agent is added in the wooden dissolving pulp after mixing acidizer processing, chelating agent optimization consumption is
0.09%, after rubbing polybag 1 minute with hand, polybag in sealing, then polybag is put into constant temperature water bath, control thermostatted water
Bath temperature T=30 DEG C, processing time is 30 min., after chelating agent processing, and filtrate is washed to distillation in neutrality.By above-mentioned work
After skill processing, the average degree of polymerization of poplar slab dissolving pulp is 488, and whiteness is 83%ISO, and content of ashes is 0.04%.
After this PROCESS FOR TREATMENT, poplar slab dissolving pulp ash content index can fully meet user and ash content in dissolving pulp is contained
The requirement of amount.
Embodiment 2：
Bamboo willow dissolving pulp after drift 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 one is：Over dry bamboo willow dissolving pulp 15g is taken, bleeding agent optimization consumption is 0.03%, it is dense to adjust slurry with distilled water
Spend for 8%, rubbed with hand after 1 minute, sealed plastic bag, polybag is put into constant temperature water bath, control constant temperature water bath temperature T
=30 DEG C, processing time is 10 min；
Step 2 is：Mixing acidizer is added in the wooden dissolving pulp after penetrant treating, mixing acidizer optimization is used
Measure as 0.8%, after rubbing polybag 1 minute with hand, polybag in sealing, then polybag is put into constant temperature water bath, control is permanent
Warm water bath temperature T=30 DEG C, processing time is 15 min；
Step 3 is：Chelating agent is added in the wooden dissolving pulp after mixing acidizer processing, chelating agent optimization consumption is
0.10%, after rubbing polybag 1 minute with hand, polybag in sealing, then polybag is put into constant temperature water bath, control thermostatted water
Bath temperature T=30 DEG C, processing time is 30 min., after chelating agent processing, and filtrate is washed to distillation in neutrality.By above-mentioned work
After skill processing, the average degree of polymerization of bamboo willow dissolving pulp is 510, and whiteness is 87%ISO, and content of ashes is 0.05%.
After this PROCESS FOR TREATMENT, 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 drift 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 one is：Over dry eucalyptus dissolving pulp 15g is taken, bleeding agent optimization consumption is 0.04%, and slurry is adjusted with distilled water
Concentration is 8%, is rubbed with hand after 1 minute, sealed plastic bag, and polybag is put into constant temperature water bath, controls water bath with thermostatic control bath temperature
T=30 DEG C are spent, processing time is 10 min；
Step 2 is：Mixing acidizer is added in the wooden dissolving pulp after penetrant treating, mixing acidizer optimization is used
Measure as 0.7%, after rubbing polybag 1 minute with hand, polybag in sealing, then polybag is put into constant temperature water bath, control is permanent
Warm water bath temperature T=30 DEG C, processing time is 15 min；
Step 3 is：Chelating agent is added in the wooden dissolving pulp after mixing acidizer processing, chelating agent optimization consumption is
0.11%, after rubbing polybag 1 minute with hand, polybag in sealing, then polybag is put into constant temperature water bath, control thermostatted water
Bath temperature T=30 DEG C, processing time is 30 min., after chelating agent processing, and filtrate is washed to distillation in neutrality.By above-mentioned work
After skill processing, the average degree of polymerization of eucalyptus dissolving pulp is 713, and whiteness is 88%ISO, and content of ashes is 0.03%.
After this PROCESS FOR TREATMENT, 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, omit step one in penetrant treating operation, remaining operation be the same as Example 1 it is identical, as a result for:Poplar
The average degree of polymerization of plank skin dissolving pulp is 488, and whiteness is 83%ISO, and content of ashes is 0.14%.
After this PROCESS FOR TREATMENT, poplar slab dissolving pulp ash content index can not meet user to content of ashes in dissolving pulp
Requirement.
Embodiment 5：
Compared with example 1, omit step 2 in mixing acid treatment operation, remaining operation be the same as Example 1 it is identical, as a result for:Poplar
The average degree of polymerization of plank skin dissolving pulp is 490, and whiteness is 81%ISO, and content of ashes is 0.16%.
After this PROCESS FOR TREATMENT, poplar slab dissolving pulp ash content index can not meet user to content of ashes in dissolving pulp
Requirement.
Embodiment 6：
Compared with example 1, the chelating agent operation process step in step 3 is omitted, remaining operation be the same as Example 1 is identical, as a result
For:The average degree of polymerization of poplar slab dissolving pulp is 487, and whiteness is 81%ISO, and content of ashes is 0.15%.
After this PROCESS FOR TREATMENT, poplar slab dissolving pulp ash content index can not meet user to content of ashes in dissolving pulp
Requirement.
Above-described embodiment is not limited for the present invention preferably embodiment, but embodiments of the present invention by embodiment
System, other any Spirit Essences and the change made under principle, modifications without departing from the present invention, combines, substitutes, simplifying and should be
Equivalence replacement mode, is included within protection scope of the present invention.
Claims (8)
1. a kind of wooden 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 wooden dissolving pulp process for deashing, it is characterised in that comprise the following steps：
（1）Infiltration is handled:Wooden dissolving pulp is added in plastic sealing bag after floating, and is added the bleeding agent described in claim 1, is added
Dosage is the 0.006-0.06% of oven dry stock quality, is rubbed with hand after 1-5 minutes, polybag is put into constant temperature by sealed plastic bag
20-40 DEG C, processing time 5-20min；
（2）Mix acid treatment：Mixing acidizer described in claim 1 is added to by step（1）Penetrant treating
In wooden dissolving pulp afterwards, mixing acidizer addition is the 0.25-1.5% of oven dry stock quality, and 1-5 points of polybag is rubbed with hand
Polybag in Zhong Hou, 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）Mix after acidizer processing
Wooden dissolving pulp in, amount of chelant be oven dry stock quality 0.021-0.21%, after rubbing polybag 1-5 minute with hand, seal
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. wooden dissolving pulp process for deashing according to claim 2, it is characterised in that step（1）It is middle to adjust wooden molten with distilled water
Solution slurry concentration is 5-10%.
4. wooden dissolving pulp process for deashing according to claim 2, it is characterised in that step（1）Middle bleeding agent addition is exhausted
The 0.02-0.04% of dry pulp quality.
5. wooden dissolving pulp process for deashing according to claim 2, it is characterised in that step（2）Middle mixing acidizer addition
Measure as the 0.7-0.9% of oven dry stock quality.
6. wooden 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. wooden dissolving pulp process for deashing according to claim 2, it is characterised in that wooden dissolving pulp be poplar slab dissolving pulp,
Bamboo willow dissolving pulp or eucalyptus dissolving pulp.
8. wooden dissolving pulp process for deashing according to claim 2, it is characterised in that step（1）Middle bleeding agent addition is exhausted
The 0.03% of dry pulp quality, step（2）Middle mixing acidizer addition is the 0.8% of oven dry stock quality, step（3）Middle chelating agent
Consumption is the 0.10% of oven dry stock quality.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111636101A (en) * | 2020-04-24 | 2020-09-08 | 赛得利(九江)纤维有限公司 | Method for removing metal ions in waste cotton fabric dissolving pulp |
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| CN111636101A (en) * | 2020-04-24 | 2020-09-08 | 赛得利(九江)纤维有限公司 | Method for removing metal ions in waste cotton fabric dissolving pulp |
| CN111636101B (en) * | 2020-04-24 | 2022-01-14 | 赛得利(九江)纤维有限公司 | Method for removing metal ions in waste cotton fabric dissolving pulp |
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