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Production method and application of compound enzyme liquid for paper pulp bleaching

A compound enzyme solution and pulp bleaching technology, which is applied in pulp bleaching, biochemical equipment and methods, enzymes, etc., can solve problems such as difficult industrial promotion and application, limited use of chemicals, and unsatisfactory application effects, etc., to achieve Low cost, low unit cost, high vitality effect

Active Publication Date: 2014-02-05
江苏富星纸业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main technical defects of the above method are: the selected enzyme is single, the amount of reducing the use of chemicals is limited, and the application effect is not very ideal; the production cost of the enzyme is too expensive, it does not have economic feasibility, and it is difficult to promote and apply industrially

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A production method of a composite enzyme solution for pulp bleaching. The enzymes of each component are weighed, mixed and prepared in a compound tank, preserved, inspected, packaged, and then stored in a warehouse at 5°C. The enzymes of each component are alkaline fruit Gelase, xylanase, mannanase and ligninase; the alkaline pectinase is CCTCC NO: M 2010004 strain culture, shake flask fermentation, seed tank to fermenter, filtration, removal prepared after bacteria and antiseptic treatment; the xylanase is prepared after CGMCC NO: 5466 strains through strain culture, shake flask fermentation, seed tank to fermenter, filtration, sterilization and antiseptic treatment; the mannan The enzyme is prepared by CGMCC NO: 6226 strains through strain culture, shake flask fermentation, seed tank to fermenter, filtration, sterilization, and antiseptic treatment; the ligninase is CGMCC NO: 6225 strains through strain culture, Shake flask fermentation, transfer the seed tank to the...

Embodiment 2

[0062] The yellow jelly in this example is prepared from the raw material reed, which is added after the yellow jelly is chlorinated. The activity of alkaline pectinase in the compound enzyme liquid is 1000u / ml~1200u / ml, the activity of xylanase is 1800u / ml~2000u / ml, the activity of mannanase is 600u / ml~800u / ml, The activity of ligninase is 50u / ml~70u / ml.

[0063] The activity of alkaline pectinase in the compound enzyme liquid of this embodiment is 1100u / ml, the activity of xylanase is 1900u / ml, the activity of mannanase is 700u / ml, and the activity of ligninase is 60u / ml . The amount of compound enzyme solution added to the mass percentage of the dry yellow pulp is 0.25%, the enzyme treatment conditions are: the concentration of the yellow pulp is 8%, the temperature is 53°C, the pH value is 7.5, and the enzymatic hydrolysis time is 45 minutes. After the enzymatic hydrolysis is completed, Then carry out steps such as alkalization and bleaching to carry out chemical bleachi...

Embodiment 3

[0066] The yellow pulp of this embodiment is prepared from the raw material bagasse, which is added after alkalization of the yellow pulp. The activity of alkaline pectinase in the compound enzyme liquid is 1000u / ml~1200u / ml, the activity of xylanase is 1400u / ml~1600u / ml, the activity of mannanase is 800u / ml~1000u / ml, The activity of ligninase is 40u / ml~60u / ml.

[0067] The activity of alkaline pectinase in the compound enzyme liquid of this embodiment is 1000u / ml, the activity of xylanase is 1500u / ml, the activity of mannanase is 900u / ml, and the activity of ligninase is 60u / ml . The amount of the compound enzyme solution added to the mass percentage of the dry yellow pulp is 0.2%, and the enzyme treatment conditions are: the concentration of the yellow pulp is 8%, the temperature is 53°C, the pH value is 7.5, and the enzymatic hydrolysis time is 50 minutes. After the enzymatic hydrolysis is completed, Then carry out bleaching and other processes to carry out chemical bleac...

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PUM

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Abstract

The invention discloses a production method of a compound enzyme liquid for paper pulp bleaching, the production method is characterized by weighing component enzymes, mixing and blending in a compound tank, corrosion preventing, checking, packing and then storing in a storehouse at 5 DEG.C, wherein the component enzymes are alkaline pectinase, xylanase, mannose and ligninase; the application of the compound enzyme liquid in paper pulp bleaching comprises the following steps: stocking, pulping, washing and screening a papermaking material, preparing into yellow pulp, adding the compound enzyme liquid in the bleached yellow pulp through a metering pump, uniformly mixing and performing enzymatic hydrolysis, wherein the enzyme treatment condition is as follows: the temperature is 50-55 DEG C, and the enzymolysis time is 40-50 min; performing the chemical bleaching according to conventional process steps after the enzymolysis is finished. The component enzymes in the compound enzyme liquid are high in activity, the aim of bleaching the paper pulp in aid is achieved, the dosage of chemical raw materials in the chemical bleaching process is reduced, the bleaching effect is good, the environment pollution is less, and the component enzymes in the compound enzyme liquid are inactive to crystalline cellulose and carboxymethyl cellulose, so that the paper pulp strength cannot be damaged.

Description

technical field [0001] The invention relates to a pulp bleaching process in the papermaking pulping process, in particular to a production method and application of a composite enzyme liquid for pulp bleaching. Background technique [0002] In the bleaching of pulp for papermaking, the process is generally yellow pulp, chlorination, pulp washing, alkalization, pulp washing, bleaching, pulp washing, and white pulp. In the chlorination process, chlorine gas is often used as pulp bleaching agent. Alkali chemical Sodium hydroxide and hydrogen peroxide are commonly used as raw materials in the procedure, and calcium hypochlorite is commonly used as the raw material in the bleaching process. Due to the current environmental protection regulations, paper mills must not detect dioxins or furans in their discharged waste liquids, and the concentration of absorbent organic halides (AOX) must also be controlled at a low level. Therefore, paper mills use chlorine oxide or hydrogen pero...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12N9/88C12N9/42C12N9/08C12N9/02D21C9/10
CPCC12N9/0061C12N9/0065C12N9/248C12N9/2488C12N9/88C12Y110/03002C12Y111/01013C12Y111/01014C12Y402/02002D21C9/10
Inventor 李忠兴杨忠义
Owner 江苏富星纸业有限公司
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