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A compound enzyme preparation and a process for preparing dissolving pulp by using the enzyme preparation

A compound enzyme preparation and slurry technology, which is applied in textiles, papermaking, and fiber raw material treatment, can solve the problems of increased difficulty in sewage treatment, inappropriateness, and high consumption of steam energy, so as to reduce costs and pollute the environment , enhance the effect, and reduce the energy consumption of beating

Active Publication Date: 2014-10-22
CHAMBROAD CHEM IND RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fiber length of the cooked pulp is still 6-10mm and the strength is high, and the energy consumption of beating is high
Chlorine bleaching is used in the traditional process of bleaching. The process includes pre-acidification, chlorination, bleaching, dechlorination, acid treatment, and water washing. The process is complicated. The "white water" produced has a low pH and contains a large amount of chlorine, which increases the difficulty of sewage treatment.
[0004] A large amount of black liquor is produced during the traditional cooking process, and its COD is as high as 10×10 4 mg / L, residual alkali 10-15mg / L, mainly including lignin, hemicellulose, organic acid and a large amount of black organic matter, and because of the low calorific value of solids in sewage produced by using cotton linters as raw materials, it is not suitable for use The methods of concentration, combustion, and alkali recovery have brought great inconvenience to its treatment, and have also brought great pollution to the environment
At the same time, high temperature and high pressure are used for cooking, and the energy consumption of steam is large.

Method used

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  • A compound enzyme preparation and a process for preparing dissolving pulp by using the enzyme preparation
  • A compound enzyme preparation and a process for preparing dissolving pulp by using the enzyme preparation
  • A compound enzyme preparation and a process for preparing dissolving pulp by using the enzyme preparation

Examples

Experimental program
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Effect test

Embodiment 1

[0063] A compound enzyme preparation, consisting of compound enzyme preparation I and compound enzyme preparation II, wherein the components and mass percentages of the compound enzyme preparation I are: 0.3% of ferulic acid esterase, 1% of lipase, and 1% of pectinase , laccase 1%, antioxidant 0.5%, antifungal agent 0.5%, insect repellant 0.1%, and the rest is soluble starch;

[0064] The composition and mass percentage of compound enzyme preparation II are: xylanase 5%, cellulase 2%, dextranase 3%, arabinase 4%, antioxidant 0.5%, antifungal agent 0.5%, Insect repellent 0.1%, the rest is soluble starch;

[0065] The dissolving pulp production process using the above-mentioned compound enzyme preparation specifically includes the following steps:

[0066] After preliminary manual dust removal, 6 tons of cotton linters were removed, the slurry concentration was adjusted to 10%, the pH of the solution was adjusted to 6.5, 12kg of compound enzyme preparation I agent was added, an...

Embodiment 2

[0071] A compound enzyme preparation, consisting of compound enzyme preparation I and compound enzyme preparation II, wherein the components and mass percentages of the compound enzyme preparation I are: ferulic acid esterase 0.5%, lipase 2%, pectinase 1% , laccase 3%, antioxidant 2%, antifungal agent 1.5%, insect repellent 0.3%, and the rest is dextrin;

[0072] The composition and mass percentage of compound enzyme preparation II are: xylanase 4%, cellulase 1%, glucanase 2%, arabinase 1%, antioxidant 2%, antifungal agent 2%, Insect repellent 0.5%, the rest is soluble starch;

[0073] The dissolving pulp production process using the above-mentioned compound enzyme preparation specifically includes the following steps:

[0074] Take 6 tons of cotton linters of the third type and second grade after preliminary manual dust removal, adjust the pulp concentration to 8%, adjust the pH of the solution to 5.5, add 24kg of compound enzyme preparation I, and treat at 50°C for 24h. Ad...

Embodiment 3

[0080] A compound enzyme preparation, which is composed of compound enzyme preparation I and compound enzyme preparation II, wherein the composition and mass percentage content of the compound enzyme preparation I are: 2% ferulic acid esterase, 1% lipase, and 5% pectinase , laccase 3%, antioxidant 1%, antifungal agent 1%, insect repellent 0.2%, soluble starch 80%, dextrin 6.8%;

[0081] The composition and mass percentage of compound enzyme preparation II are: xylanase 3%, cellulase 5%, dextranase 5%, arabinase 1%, antioxidant 1%, antifungal agent 1.5%, Insect repellent 0.2%, the rest is soluble starch;

[0082] The dissolving pulp production process using the above-mentioned compound enzyme preparation specifically includes the following steps:

[0083] Take 6 tons of second-class and third-class cotton linters after preliminary manual dust removal, adjust the pulp concentration to 12%, adjust the pH of the solution to 6.5, add 30kg of compound enzyme preparation I, and trea...

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Abstract

The invention relates to the technical field of production of regenerated cellulose fiber, in particular discloses a complex enzyme preparation applied in the preparation of dissolving pulp and a technique for preparing the dissolving pulp by using the enzyme preparation. The complex enzyme preparation is divided into a complex enzyme preparation I and a complex enzyme preparation II, wherein the complex enzyme preparation I mainly consists of feruloyl esterase, lipase and the like; and the complex enzyme preparation II mainly consists of xylanase, cellulase and the like. The complex enzyme preparation is applied in the technique for purifying alpha-cellulose and preparing the dissolving pulp; and the technique comprises the following steps of impurity removal for raw materials, enzyme method pretreatment, enzymolysis pulping, chelation treatment, alkali hydroxyl active oxygen cooking, acid treatment, washing, sand removal and pulp mixing. The method has the simple preparation technique, and adopts the complex enzyme preparation to treat the raw material pulp so as to effectively remove lignin, hemicellulose, pectin substance and waxiness and to reduce the degree of polymerization of the alpha-cellulose; the energy consumption is low under the normal pressure condition; the COD (Chemical Oxygen Demand) value of the pulping waste water is low; the yield of the dissolving pulp is high; the alpha-cellulose has high content and uniform degree of polymerization; and the production requirements of viscose can be satisfied.

Description

Technical field: [0001] The invention belongs to the technical field of regenerated cellulose fiber production, and discloses a compound enzyme preparation and a process for purifying α-cellulose by using the enzyme preparation to prepare dissolving pulp. Background technique: [0002] Dissolving pulp can be used to produce viscose fiber, cellulose acetate, nitrocellulose, carboxymethyl cellulose and other products through chemical modification. This "special pulp" is an important raw material for cellulose derivative products. At present, most of the dissolving pulp is produced by the improved sulfate method and sulfite method. The goal is to obtain high-purity cellulose, but part of the cellulose is lost through chemical modification, which reduces the yield and increases the production cost. . Cotton and coniferous wood are the main raw materials for dissolving pulp production, and some hardwood raw materials are also used. With the development and utilization of bamboo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C5/00
Inventor 徐泽平马杰门振陈振发王秀芝谭飞飞胡月
Owner CHAMBROAD CHEM IND RES INST CO LTD
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