Pulping method for treating waste paper pulp with neutral cellulase and neutral xylanase

A technology of neutral cellulase and xylanase, applied in the field of papermaking, can solve the problem of no obvious improvement in physical indicators such as pulp strength, and achieve the improvement of keratinization phenomenon, the enhancement of folding and bursting resistance, and the promotion of water filter effect

Active Publication Date: 2020-04-21
SHANDONG YOUTELL BIOCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be confirmed that when the acid cellulase is used under the neutral condition of waste paper pulp, there is no obvious change in the drainage of the pulp, and there is no obvious improvement in physical indicators such as pulp strength.

Method used

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  • Pulping method for treating waste paper pulp with neutral cellulase and neutral xylanase
  • Pulping method for treating waste paper pulp with neutral cellulase and neutral xylanase
  • Pulping method for treating waste paper pulp with neutral cellulase and neutral xylanase

Examples

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Effect test

Embodiment 1

[0026] A pulping method utilizing neutral cellulase and neutral xylanase to treat waste paper pulp, comprising the following steps:

[0027] A, waste paper pulp pretreatment: add cetyl trimethyl ammonium chloride to corrugated paper waste paper pulp, the concentration of described corrugated paper waste paper pulp is 2.5%, the addition amount of described cetyl trimethyl ammonium chloride is corrugated paper 0.08wt% of the absolute dry weight of waste paper pulp; pulping for 15 minutes at 30°C and 200 rpm / min to obtain pretreated waste paper pulp;

[0028] B. Enzymatic hydrolysis of waste paper pulp: adjust the pH value of the pretreated waste paper pulp obtained in step A to 6.5, and add the thermophilic Chaetomium cellulase and neutral xylanase at a temperature of 45°C. The thermophilic Chaetomium The added amount of cellulase is 0.1kg / t dry pulp; the added amount of neutral xylanase is 0.1kg / t dry pulp; heat preservation treatment at 220rpm / min for 55min to obtain enzymatic...

Embodiment 2

[0035] A pulping method utilizing neutral cellulase and neutral xylanase to treat waste paper pulp, comprising the following steps:

[0036] A, waste paper pulp pretreatment: add cetyl trimethyl ammonium chloride to corrugated paper waste paper pulp, the concentration of described corrugated paper waste paper pulp is 3.5%, the addition amount of described cetyl trimethyl ammonium chloride is corrugated paper 0.05wt% of the dry weight of waste paper pulp; pulping at 35°C and 180rpm / min for 20min to obtain pretreated waste paper pulp;

[0037]B. Enzymatic hydrolysis of waste paper pulp: adjust the pH value of the pretreated waste paper pulp obtained in step A to 7.5, and add the thermophilic Chaetomium cellulase and neutral xylanase at a temperature of 40°C. The thermophilic Chaetomium The added amount of cellulase is 0.3kg / t dry pulp; the added amount of the neutral xylanase is 0.05kg / t dry pulp; heat preservation treatment at 250rpm / min for 40min to obtain enzymatically hydrol...

Embodiment 3

[0044] A pulping method utilizing neutral cellulase and neutral xylanase to treat waste paper pulp, comprising the following steps:

[0045] A, waste paper pulp pretreatment: add cetyl trimethyl ammonium chloride to corrugated paper waste paper pulp, the concentration of described corrugated paper waste paper pulp is 3%, the addition amount of described cetyl trimethyl ammonium chloride is corrugated paper 0.07wt% of waste paper pulp dry weight; pulping at 32°C and 190rpm / min for 17min to obtain pretreated waste paper pulp;

[0046] B. Enzymatic hydrolysis of waste paper pulp: adjust the pH value of the pretreated waste paper pulp obtained in step A to 7, and add the thermophilic Chaetomium cellulase and neutral xylanase at a temperature of 42°C. The thermophilic Chaetomium The addition amount of cellulase is 0.2kg / t dry pulp; the addition amount of the neutral xylanase is 0.075kg / t dry pulp; heat preservation treatment at 235rpm / min for 47min to obtain enzymolysis waste paper...

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Abstract

The invention provides a pulping method for treating waste paper pulp by utilizing neutral cellulase and neutral xylanase. The pulping method comprises the following steps: firstly an air gap of a fiber cell wall is prevented from being closed by adopting the long-chain effect of hexadecyl trimethyl ammonium chloride, and then the waste paper pulp is synergistically treated by using the neutral cellulase and neutral xylanase at the same time, so that multiple measures at the same time, fibers in the waste paper pulp are modified, cutinized fibers in the waste paper pulp basically restore the original swelling capability, the cutinization phenomenon of the fibers is alleviated, the drainage of paper pulp is promoted, paper machine speed is improved, and ring crush strength and folding endurance of finished paper are obviously improved.

Description

technical field [0001] The invention belongs to the technical field of papermaking, and in particular relates to a pulping method for treating waste paper pulp with neutral cellulase and neutral xylanase. Background technique [0002] According to statistics, the reduction of forest area in the world increases sharply every year, and the paper industry is a large consumer of wood. In my country, wood resources are scarce. In recent years, people have paid more and more attention to the recycling of secondary fibers. The integration of recycling and forestry and paper has gradually become the two major development trends of the modern paper industry. The application of biotechnology in the pulp and paper industry has become more and more extensive, and it has become the focus of research. Biotechnology is applied to the recycling of waste paper pulp, which can effectively remove some useless fine fibers and water-soluble colloids in waste paper pulp, promote the drainage of p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C5/00D21B1/32
CPCD21B1/32D21C5/005Y02W30/64
Inventor 慈元钊刘国锋李新良张民
Owner SHANDONG YOUTELL BIOCHEM
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