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Method of controlling secondary gummy substances by using lipase

A technology for stickies and lipase, which is applied in the field of pulping and papermaking of waste paper, and achieves the effect of low production cost, improved quality and genuine product rate, and good effect.

Inactive Publication Date: 2013-04-24
TAIXING YIMING BIOLOGICAL PRODS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for controlling secondary stickies in pulp and white water by lipase for the problem of secondary stickies in the production process of old newsprint deinking pulp, old corrugated box board pulp and mechanical pulp

Method used

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  • Method of controlling secondary gummy substances by using lipase
  • Method of controlling secondary gummy substances by using lipase
  • Method of controlling secondary gummy substances by using lipase

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The preparation of embodiment 1 Rhizopus sinica lipase

[0037] Rhizopus sinensis was selected as the fermentation strain; the solid slant medium was 5 po malt juice agar medium, pH 7, and the liquid fermentation medium was 30% soybean milk, 1% glucose, 1% olive oil, 2% K2HPO4, 0.5% MgSO4 , pH7; first inoculate the slant medium by streaking, incubate at 30°C for 3 days until black spores are formed, then gently wash the spores with sterile water, shake well to make a spore suspension, and put it in a sterile Erlenmeyer flask save.

[0038] Then carry out the fermentation culture of Rhizopus chinensis, inoculate the sterilized liquid medium, culture on a shaking table, 220 r / min, 30 ℃ for 60 h (to allow the bacteria to fully grow), to obtain flocculent cells, wash with water, and filter to obtain wet The liquid Rhizopus sinensis lipase is obtained from the thalline, the enzyme activity of the obtained Rhizopus sinensis lipase is 20000U / mL, and the pH value is 8.0.

Embodiment 2

[0040] Control of secondary stickies in waste paper pulp production using Rhizopus sinensis lipase.

[0041] Take 30g of DIP and OCC dry pulp respectively, dilute the pulp with a concentration of 3%, and treat the old newsprint DIP pulp and OCC pulp under different additions of Rhizopus sinensis lipase. It is 0.001-0.5% of the weight of DIP and OCC dry pulp, the temperature is 20-60°C, and the time is 60-120min.

[0042] According to the document Sarja T, Zabihian M and Kourunen P. Control of Potential Secondary Stickies in Deinked Pulp. 2003 TAPPI Fall Technical Conference, Paper 22-2., when the pH of the water sample decreases, the resin and other dissolved The turbidity value of the system increases, and the turbidity difference is the change value between the turbidity and the initial turbidity when the pH is adjusted to 4 by sulfuric acid, and the colloidal substances such as resin acid and styrene-butadiene latex in the system There is a positive phase relationship betw...

Embodiment 3

[0050] Control of secondary stickies in papermaking white water by Rhizopus sinica lipase.

[0051] 200mL old newsprint DIP pulp and OCC pulp machine white water samples were taken respectively, and treated with different amounts of Rhizopus sinensis lipase. The lipase activity of Rhizopus sinensis is 20000U / mL, the amount added is 0.001-0.5% of the weight of old newsprint DIP pulp and OCC pulp machine white water sample, the temperature is 20-60°C, and the time is 60-120min.

[0052] Centrifuge the treated white water of the paper machine at 2000r / min for 15 minutes to remove fine fibers and other components; test the cation demand and turbidity of the centrifuged white water, then use sulfuric acid to adjust the pH to 4, then measure the turbidity, and calculate the pH before and after adjustment difference in turbidity. The test results when the enzyme dosage is 0.001%, 0.05%, and 0.5% are as follows, and the removal rate of secondary stickies is calculated by the change o...

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Abstract

The invention discloses a method of using lipase to treat secondary gummy substances in paper pulp and white water produced in papermaking with waste paper. The lipase is alkaline lipase with a pH value of 7.5 to 9.0, enzyme activity of more than 100 U / mL, a hydrolysis rate of triglyceride of no less than 95% and transesterification and lipogenesis rates of less than 3%. A treating method for the paper pulp comprises steps consisting of adding the lipase accounting for 0.001 to 0. 5% of dry weight of the paper pulp into the paper pulp having a concentration adjusted to be 2 to 5%, carrying out treating and filtering, centrifuging and detecting the treated pulp. A treating method for the white water comprises steps consisting of adding the lipase accounting for 0.001 to 0. 5% of dry weight of the white water into the papermaking white water, carrying out treating and filtering, centrifuging and detecting the treated white water. According to the invention, the lipase is utilized to fundamentally degrade the gummy substances and mitigate deposition tendency of the gummy substances so as to remove the gummy substances, so the problem of pollution by secondary gummy substances is thoroughly overcome; and the method is simple to operate, has a substantial removal effect and enables the quality of papermaking with waste paper to be improved and production cost to be reduced.

Description

technical field [0001] The invention belongs to the field of waste paper pulping and papermaking, and in particular relates to a method for using lipase to control secondary stickies in the waste paper pulping production process. Background technique [0002] In the past ten years, the consumption of waste paper in the paper industry has grown rapidly, and the proportion of waste paper pulp in the total global pulp consumption has continued to increase. The recycling and reuse of waste paper can not only save a large amount of plant fiber raw materials, energy and reduce costs, but also It is beneficial to protect the environment and reduce the damage to the ecological environment. It has not only economic benefits, but also good social and environmental benefits. With the increase of the utilization ratio of waste paper pulp and the improvement of the degree of closed circulation of white water, the problem of stickies in the waste paper recycling process is becoming more a...

Claims

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Application Information

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IPC IPC(8): D21C5/02
CPCY02W30/64
Inventor 裴继诚郭宏明
Owner TAIXING YIMING BIOLOGICAL PRODS
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