CN101289761A - Process for preparing dissolved pulp by oxidative decomposition of paper pulp - Google Patents
Process for preparing dissolved pulp by oxidative decomposition of paper pulp Download PDFInfo
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- CN101289761A CN101289761A CNA2008100446568A CN200810044656A CN101289761A CN 101289761 A CN101289761 A CN 101289761A CN A2008100446568 A CNA2008100446568 A CN A2008100446568A CN 200810044656 A CN200810044656 A CN 200810044656A CN 101289761 A CN101289761 A CN 101289761A
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Abstract
The invention discloses a method for preparing dissolving pulp through oxide degradation of pulp by adoption of the oxide degradation method so as to solve the problems in the prior dissolving pulp preparation technique of severe pollution, low yield, long period, resource shortage and so on. The method for preparing the dissolving pulp through oxide degradation of the pulp comprises the following processing steps of: alkalizing purification, squeezing preparation of alkali cellulose, oxygenization, and continuous oxide degradation and depolymerization. By adoption of the method, the production speed can be improved; the product quality can be improved; the steam consumption can be saved; and the generation of pollutants can be reduced.
Description
Technical field
The present invention relates to adopt the oxygen solution to prepare the production method of dissolving pulp, specifically adopt the oxygen solution and connect and steam the method that pulp preparation such as wood, bamboo is become to be used for the dissolving pulp of viscose production.
Background technology
Tradition dissolving pulp pulping process mostly is prehydrolysis alkaline cooking and (Asia) kraft cooking, is depositing seriously pollutedly, and yield is hanged down two large problems.Domestic pulping technique still is in a lower level of production at present simultaneously, begins to adopt the continuously cooking except that coinage slurry factory department divides, and other all adopts traditional rotary spherical digester to carry out a high temperature, the formula boiling of high-alkali crack.Adopt traditional alkaline process and rotary spherical digester to carry out the clearance-type boiling, pulping yield is not high, and production scale is little, and the waste vapour that boiling produces is very big to ambient influnence.Along with the adjustment of national industrial policies, gap boiling vessels such as rotary spherical digester will be eliminated by pottery, and the pulp mill must develop cleaner production pulping technique and the economized production model that the raw material adaptive capacity is strong, production efficiency is high, the product dirt is few.Be badly in need of on the one hand realizing cleaner production slurrying, on the other hand, need seek new raw material and technology and substitute existing raw material and technology,, reduce and pollute, the purpose of increasing economic efficiency to realize energy savings by technological change.
The oxygen solution that oxygen solution that coinage slurry factory adopts and this patent are suitable for has essential distinction.Separate at whole oxygen that temperature and alkali charge are critical factors in the process, it directly affects oxygen and separates speed and product quality.The oxygen solution temperature requirement that coinage slurry factory adopts is generally at 120 ℃ to 140 ℃, and alkali charge is less than 12%, and purpose is to remove grease in the raw material, wax, lignin etc.Present technique oxygen solution temperature requirement is generally at 30 ℃ to 100 ℃, and alkali charge is greater than 18%, and purpose is the purification cellulose and is to make the big molecule of fiber fall poly-.
Summary of the invention
The present invention is intended to seriously polluted, the problems such as yield is low, the cycle is long, shortage of resources at traditional dissolving pulp preparation technology existence, a kind of method that adopts the preparing dissolved pulp by oxidative decomposition of paper pulp of oxygen solution is proposed, the problems referred to above are resolved, adopt the present invention and can improve speed of production, promote product quality, save steam consumption, reduce the generation of pollutant.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
The method of preparing dissolved pulp by oxidative decomposition of paper pulp is characterized in that: processing step is that alkali steeping is purified, squeezing preparation alkali fibre, oxygenation, continuously oxygen separate fall poly-.
Alkali concn in the described alkali steeping operation is 40g/l-200g/l, and dipping temperature 20-60 ℃, dip time is 5-90 minute.
Flooding slurry dense in the described alkali steeping operation is 1-12%, and to reach the abundant swollen of fiber, the abundant strippings of oligomer such as half fibre realize the purpose that alpha cellulose is purified.
With the Water Extraction Machinery dehydration, regulate bath raio 1: 2-1 in the described squeezing process: 8, the technological requirement that dense or high dense oxygen is separated in reaching.
Oxygen is pressed and is 0.2Mpa-1.0Mpa in the described oxygenation operation, adopts pure oxygen or compressed air all can.
Described continuous oxygen is separated in the operation oxygen and is pressed and be 0.2Mpa-1.0Mpa, and it is 30 ℃-100 ℃ that oxygen is separated temperature, and oxygen is separated 30 minutes-120 minutes time.
Beneficial effect of the present invention shows:
One, reduce pollution: black liquor organic concentration CODcr is from 6 * 10 of traditional handicraft
4Be reduced to 3 * 10 more than the mg/L
4Below the mg/L, the emission reduction effect highly significant
Traditional handicraft (coinage technology) belongs to high temperature (170 ℃) high pressure (7.5Kgf/cm
2) boiling.Basic hydrolysis, peeling reaction etc. will take place in celluloses a large amount of when temperature is higher than 140 ℃, cause a large amount of cellulosic molecule chain ruptures, produce a large amount of lower-molecular substances, are dissolved in the black liquor and increase the black liquor organic matter concentration is arranged thereby be hydrolyzed to polysaccharide.Pulp by oxidative decomposition of paper legal system slurry temperature is controlled at below 100 ℃ has avoided peeling reaction, reduces basic hydrolysis, has reduced organic concentration in the black liquor.Simultaneously because the existence of aerobic, the oxidized degraded of most organic matter reducibility group, slurrying COD generation descends more than 50%.
Two, improve pulping yield: improve more than 2% than traditional handicraft
Traditional handicraft belongs to high temperature (170 ℃) high pressure (7.5Kgf/cm as mentioned above
2) boiling.Basic hydrolysis, peeling reaction etc. will take place in celluloses a large amount of when temperature is higher than 140 ℃, cause a large amount of cellulosic molecule chain ruptures, and therefore a large amount of celluloses will run off, and causes pulping yield low.Also can reduce cellulosic basic hydrolysis and peeling reaction at present without any a kind of auxiliary agent.Oxygen solution slurrying temperature is controlled at below 100 ℃ has avoided peeling reaction, has reduced basic hydrolysis, reduces fiber loss, has improved the fiber yield.
Three, improve product quality: the fine content of first improves 1% from traditional handicraft
The tradition impregnation technology is to flood boiling according to alkali lye goal liquor ratio.This method fluid volume is less, and fiber can not be by abundant swollen, thus the less alpha cellulose of can better not purifying of half fibrinolytic output.The impregnation technology that oxygen is separated slurrying is to adopt high liquor ratio dipping, makes every fiber all obtain sufficient swollen, a large amount of stripping of half fibre, and fiber has obtained purification.The goal liquor ratio is regulated by dehydration in the dipping back, and the alkali lye after deviating from is recycled.
Four, oxygen is separated effective shortening slurrying cycle continuously
Cellulose degradation mainly is basic hydrolysis and cellulosic peeling reaction in traditional handicraft, and adopts the batch (-type) boiling, and the mass transfer effect of heat and chemicals is poor, causes reacting inhomogeneous, and degradation speed is slow, and the slurrying cycle is long.Adopt oxygen to separate and connect and steam technology, can make cellulosic material oxidative degradation under the effect that is subjected to oxygen, cellulosic oxidative degradation mainly occurs on the free hydroxyl group position of C2, C3, C6 position of cellulose glucose basic ring, occurs in simultaneously on the C1 position of cellulose reducing end under neutral.
Five, raw material sources have been expanded: applicable to wood, bamboo pulp or other pulpboards prepared dissolving pulp of the present invention.
The specific embodiment
Embodiment 1:
A, sample are wood pulp, oven dry weight 1Kg
B, cold alkali steeping, dipping alkali is dense: 87g/l
C, dipping are starched dense: 5%
D, promoter addition: 0.2%
E, dip time: 8 minutes
F, dipping finish the back and dewater with Water Extraction Machinery
It is 1: 3 that bath raio is regulated in g, squeezing
H, oxygenation oxygen are pressed and are 0.5Mpa
I, oxygen are separated the oxygen pressure and are 0.5Mpa
It is 48 ℃ that j, oxygen are separated temperature
K, the oxygen time of separating are 100 minutes.
This embodiment and conventional method compare:
Embodiment 2:
A, sample are bamboo pulp, oven dry weight 1Kg
B, cold alkali steeping, dipping alkali is dense: 87g/l
C, dipping are starched dense: 5%
D, promoter addition: 0.2%
E, dip time: 8 minutes
F, dipping finish the back and dewater with Water Extraction Machinery
It is 1: 3 that bath raio is regulated in g, squeezing
H, oxygenation oxygen are pressed and are 0.5Mpa
I, oxygen are separated the oxygen pressure and are 0.5Mpa
It is 50 ℃ that j, oxygen are separated temperature
K, the oxygen time of separating are 60 minutes.
This embodiment and conventional method compare:
Embodiment 3:
A, sample are wood pulp, oven dry weight 1Kg
B, cold alkali steeping, dipping alkali is dense: 110g/l
C, dipping are starched dense: 5%
D, promoter addition: 0.2%
E, dip time: 30 minutes
F, dipping finish the back and dewater with Water Extraction Machinery
It is 1: 4 that bath raio is regulated in g, squeezing
H, oxygenation oxygen are pressed and are 0.4Mpa
I, oxygen are separated the oxygen pressure and are 0.4Mpa
It is 65 ℃ that j, oxygen are separated temperature
K, the oxygen time of separating are 40 minutes.
This embodiment and conventional method compare:
Embodiment 4:
A, sample are bamboo pulp, oven dry weight 1Kg
B, cold alkali steeping, dipping alkali is dense: 65g/l
C, dipping are starched dense: 4%
D, promoter addition: 0.1%
E, dip time: 60. minutes
F, dipping finish the back and dewater with Water Extraction Machinery
It is 1: 5 that bath raio is regulated in g, squeezing
H, oxygenation oxygen are pressed and are 0.6Mpa
I, oxygen are separated the oxygen pressure and are 0.6Mpa
It is 70 ℃ that j, oxygen are separated temperature
K, the oxygen time of separating are 50 minutes.
This embodiment and conventional method compare:
Embodiment 5:
A, sample are wood pulp, oven dry weight 1Kg
B, cold alkali steeping, dipping alkali is dense: 150g/l
C, dipping are starched dense: 3.5%
D, promoter addition: 0.3%
E, dip time: 20 minutes
F, dipping finish the back and dewater with Water Extraction Machinery
It is 1: 2.5 that bath raio is regulated in g, squeezing
H, oxygenation oxygen are pressed and are 0.25Mpa
I, oxygen are separated the oxygen pressure and are 0.25Mpa
It is 60 ℃ that j, oxygen are separated temperature
K, the oxygen time of separating are 30 minutes.
This embodiment and conventional method compare:
Embodiment 6:
A, sample are bamboo pulp, oven dry weight 1Kg
B, cold alkali steeping, dipping alkali is dense: 110g/l
C, dipping are starched dense: 6%
D, promoter addition: 0.2%
E, dip time: 90. minutes
F, dipping finish the back and dewater with Water Extraction Machinery
It is 1: 6 that bath raio is regulated in g, squeezing
H, oxygenation oxygen are pressed and are 0.4Mpa
I, oxygen are separated the oxygen pressure and are 0.4Mpa
It is 85 ℃ that j, oxygen are separated temperature
K, the oxygen time of separating are 30 minutes.
This embodiment and conventional method compare:
Embodiment 7:
A, sample are wood pulp, oven dry weight 1Kg
B, cold alkali steeping, dipping alkali is dense: 65g/l
C, dipping are starched dense: 3.5%
D, promoter addition: 0.2%
E, dip time: 60 minutes
F, dipping finish the back and dewater with Water Extraction Machinery
It is 1: 8 that bath raio is regulated in g, squeezing
H, oxygenation oxygen are pressed and are 0.6Mpa
I, oxygen are separated the oxygen pressure and are 0.6Mpa
It is 80 ℃ that j, oxygen are separated temperature
K, the oxygen time of separating are 120 minutes.
This embodiment and conventional method compare:
Embodiment 8:
A, sample are bamboo pulp, oven dry weight 1Kg
B, cold alkali steeping, dipping alkali is dense: 150g/l
C, dipping are starched dense: 5%
D, promoter addition: 0.2%
E, dip time: 60. minutes
F, dipping finish the back and dewater with Water Extraction Machinery
It is 1: 4 that bath raio is regulated in g, squeezing
H, oxygenation oxygen are pressed and are 0.25Mpa
I, oxygen are separated the oxygen pressure and are 0.25Mpa
It is 60 ℃ that j, oxygen are separated temperature
K, the oxygen time of separating are 60 minutes.
This embodiment and conventional method compare:
As can be seen from the above embodiments, adopt the oxygen solution to prepare the dissolving pulp new technology and can prepare the viscose production pulp that conforms to quality requirements.Because the oxygen condition of separating is carried out at a lower temperature, has avoided peeling reaction, has reduced basic hydrolysis, slurrying first fibre can promote more than 1%; The slurrying pollutional load obviously reduces, and CODcr can reduce more than 50%; Pulping yield improves more than 2%.
Claims (6)
1, the method for preparing dissolved pulp by oxidative decomposition of paper pulp is characterized in that: processing step is that alkali steeping is purified, squeezing preparation alkali fibre, oxygenation, continuously oxygen separate fall poly-.
2, the method for preparing dissolved pulp by oxidative decomposition of paper pulp according to claim 1 is characterized in that: the alkali concn in the described alkali steeping operation is 40g/l-200g/l, and dipping temperature 20-60 ℃, dip time is 5-90 minute.
3, the method for preparing dissolved pulp by oxidative decomposition of paper pulp according to claim 1 and 2 is characterized in that: dipping is starched the dense 1-12% that is in the described alkali steeping operation.
4, the method for preparing dissolved pulp by oxidative decomposition of paper pulp according to claim 3 is characterized in that: with the Water Extraction Machinery dehydration, regulate bath raio 1: 2-1 in the described squeezing process: 8, and the technological requirement that dense or high dense oxygen is separated in reaching.
5, the method for preparing dissolved pulp by oxidative decomposition of paper pulp according to claim 4 is characterized in that: oxygen is pressed and is 0.2Mpa-1.0Mpa in the described oxygenation operation.
6, the method for preparing dissolved pulp by oxidative decomposition of paper pulp according to claim 5 is characterized in that: described continuous oxygen is separated in the operation oxygen and is pressed and be 0.2Mpa-1.0Mpa, and it is 30 ℃-100 ℃ that oxygen is separated temperature, and oxygen is separated 30 minutes-120 minutes time.
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| CNA2008100446568A CN101289761A (en) | 2008-06-10 | 2008-06-10 | Process for preparing dissolved pulp by oxidative decomposition of paper pulp |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102992483A (en) * | 2011-09-15 | 2013-03-27 | 林德股份公司 | Oxygen treatment of water and pulp from paper or cardboard production |
| CN104831387A (en) * | 2015-05-27 | 2015-08-12 | 宜宾丝丽雅集团有限公司 | Preparation process of extinction high-strength low-elongation viscose fiber |
| CN104831392A (en) * | 2015-05-27 | 2015-08-12 | 宜宾丝丽雅集团有限公司 | High-strength low-elongation viscose fiber and preparation method thereof |
| CN104846455A (en) * | 2015-05-27 | 2015-08-19 | 宜宾丝丽雅集团有限公司 | High-strength low-elongation viscose fiber and preparation method and application thereof |
| CN104846453A (en) * | 2015-05-27 | 2015-08-19 | 宜宾丝丽雅集团有限公司 | Superfine viscose fiber and preparation method thereof |
| CN104894670A (en) * | 2015-05-27 | 2015-09-09 | 宜宾丝丽雅集团有限公司 | High-strength viscose fiber and preparation method and application thereof |
| CN104911726A (en) * | 2015-05-27 | 2015-09-16 | 宜宾丝丽雅集团有限公司 | Extinction superfine high-strength low-elongation viscose fiber and preparation method thereof |
| CN104928786A (en) * | 2015-05-27 | 2015-09-23 | 宜宾丝丽雅集团有限公司 | Preparation process of semi-dull high-strength low-elongation viscose fiber |
| WO2016188274A1 (en) * | 2015-05-27 | 2016-12-01 | 宜宾丝丽雅集团有限公司 | Matte high-strength, low-stretch viscose fiber and manufacturing method therefor |
| CN109706770A (en) * | 2018-12-25 | 2019-05-03 | 新疆富丽达纤维有限公司 | A kind of pulping production technology that production procedure is short |
| CN112431055A (en) * | 2020-11-16 | 2021-03-02 | 陕西科技大学 | Novel process for preparing dissolving pulp from chemical pulp for papermaking |
-
2008
- 2008-06-10 CN CNA2008100446568A patent/CN101289761A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102992483A (en) * | 2011-09-15 | 2013-03-27 | 林德股份公司 | Oxygen treatment of water and pulp from paper or cardboard production |
| CN102992483B (en) * | 2011-09-15 | 2017-03-01 | 林德股份公司 | In paper or production, the oxygen of water and paper pulp is processed |
| CN104911726A (en) * | 2015-05-27 | 2015-09-16 | 宜宾丝丽雅集团有限公司 | Extinction superfine high-strength low-elongation viscose fiber and preparation method thereof |
| CN104846455A (en) * | 2015-05-27 | 2015-08-19 | 宜宾丝丽雅集团有限公司 | High-strength low-elongation viscose fiber and preparation method and application thereof |
| CN104846453A (en) * | 2015-05-27 | 2015-08-19 | 宜宾丝丽雅集团有限公司 | Superfine viscose fiber and preparation method thereof |
| CN104894670A (en) * | 2015-05-27 | 2015-09-09 | 宜宾丝丽雅集团有限公司 | High-strength viscose fiber and preparation method and application thereof |
| CN104831392A (en) * | 2015-05-27 | 2015-08-12 | 宜宾丝丽雅集团有限公司 | High-strength low-elongation viscose fiber and preparation method thereof |
| CN104928786A (en) * | 2015-05-27 | 2015-09-23 | 宜宾丝丽雅集团有限公司 | Preparation process of semi-dull high-strength low-elongation viscose fiber |
| WO2016188274A1 (en) * | 2015-05-27 | 2016-12-01 | 宜宾丝丽雅集团有限公司 | Matte high-strength, low-stretch viscose fiber and manufacturing method therefor |
| WO2016188275A1 (en) * | 2015-05-27 | 2016-12-01 | 宜宾丝丽雅集团有限公司 | High-strength, low-stretch viscose fiber and manufacturing method therefor |
| CN104831387A (en) * | 2015-05-27 | 2015-08-12 | 宜宾丝丽雅集团有限公司 | Preparation process of extinction high-strength low-elongation viscose fiber |
| CN109706770A (en) * | 2018-12-25 | 2019-05-03 | 新疆富丽达纤维有限公司 | A kind of pulping production technology that production procedure is short |
| CN112431055A (en) * | 2020-11-16 | 2021-03-02 | 陕西科技大学 | Novel process for preparing dissolving pulp from chemical pulp for papermaking |
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Open date: 20081022 |