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

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
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Example Embodiment

[0036] Example 1 Preparation of Rhizopus chinensis lipase

[0037] Rhizopus chinensis was selected as the fermentation strain; the solid slope medium was 5 po wort agar medium, pH 7, and the liquid fermentation medium was soybean milk 30%, glucose 1%, olive oil 1%, K2HPO4 2%, MgSO4 0.5% , PH7; first streak inoculation of the slant medium, culture at 30°C for 3 days until black spores are formed, then gently wash the spores with sterile water, shake well, make a spore suspension, and place it in a sterile Erlenmeyer flask save.

[0038] Then carry out the fermentation culture of Rhizopus chinensis, inoculate the sterilized liquid medium, culture in a shaker, 220 r / min, 30 ℃ for 60 h (to allow the bacteria to grow fully), obtain flocculent cells, wash with water, and filter to get wet The bacterial body obtains a liquid Rhizopus schinensis lipase, and the obtained Rhizopus schinensis lipase has an enzyme activity of 20000 U / mL and a pH of 8.0.

Example Embodiment

[0039] Example 2

[0040] Rhizopus chinensis lipase is used to control the secondary stickies in the production process of waste paper pulp.

[0041] Take 30g of DIP and OCC absolute dry pulp, and dilute the pulp with a concentration of 3%, and treat the old newsprint DIP pulp and OCC pulp at different Rhizopus chinensis lipase addition levels. The Rhizopus chinensis lipase enzyme activity is 20000U / mL, and the addition amount is It is 0.001-0.5% of the weight of the absolute dry pulp of DIP and OCC, the temperature is 20-60℃, and the time is 60-120min.

[0042] According to the literature 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 substances in the slurry The turbidity value of the system rises due to the instability of the colloidal substances and the deposition. The turbidity difference is the change value of...

Example Embodiment

[0049] Example 3

[0050] The Rhizopus chinensis lipase is used to control the secondary stickies in the papermaking white water.

[0051] Take 200mL old newsprint DIP pulp and OCC pulp and paper machine white water samples respectively, and treat them under different addition amounts of Rhizopus chinensis lipase. Rhizopus chinensis lipase enzyme activity is 20000U / mL, the addition amount is 0.001-0.5% of the weight of the old newsprint DIP pulp and OCC pulp paper machine white water sample, the temperature is 20-60℃, and the time is 60-120min.

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

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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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