Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for controlling secondary stickies through lipase

A technology of lipase and sticky matter, which is applied in the field of waste paper pulping and papermaking, and achieves the effects of low production cost, good effect and simple operation

Active Publication Date: 2015-04-29
TAIXING YIMING BIOLOGICAL PRODS
View PDF5 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for controlling secondary stickies through lipase
  • Method for controlling secondary stickies through lipase
  • Method for controlling secondary stickies through lipase

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Control of secondary stickies in waste paper pulp production using lipase.

[0035] 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 lipase additions. The lipase activity is 20000U / mL, and the pH value is 8.0. The hydrolysis rate of triglyceride is greater than 96%, the rate of lipase transesterification and lipid synthesis is less than 2%, the addition amount is 0.001-0.5% of the weight of DIP and OCC dry pulp respectively, the temperature is 20-60°C, and the time is 60- 120min.

[0036]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 turbidi...

Embodiment 2

[0044] Using lipase to control secondary stickies in papermaking white water.

[0045] 200mL old newsprint DIP pulp and OCC pulp machine white water samples were taken respectively, and treated with different lipase additions. The lipase activity is 20000U / mL, the pH value is 8.0, the addition amount is 0.001-0.5% of the weight of the DIP and OCC pulp machine white water samples, the temperature is 20-60°C, and the time is 60-120min.

[0046] 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 of turbidity difference.

[0047] The resul...

Embodiment 3

[0054] Control of secondary stickies in mechanical pulp production using lipase.

[0055] Take 30g of absolute-dried masson pine TMP slurry, dilute the slurry with a concentration of 3%, and treat the slurry with different amounts of lipase added. The hydrolysis rate is greater than 96%, the lipase transesterification and lipid synthesis rate are less than 2%, the addition amount is 0.001-0.5% of the weight of dry masson pine TMP pulp, the temperature is 20-60°C, and the time is 60-120min.

[0056] Filter the treated slurry, take the filtrate and centrifuge at 2000r / min for 15min to remove components such as fine fibers; test the cation demand and turbidity of the water sample after centrifugation, and then use sulfuric acid to adjust the pH to 4 before measuring the turbidity and calculating Turbidity difference before and after pH adjustment. 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 calc...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for controlling secondary stickies in paper pulp and white water during waste paper papermaking process through lipase. According to the invention, the pH (potential of hydrogen) value of lipase ranges from 7.5 to 9.0, the enzyme activity is larger than 100 U / mL, the hydrolysis rate for triglyceride is not lower than 95%, and transesterification and lipid synthesis rate of alkaline lipase is lower than 3%; a paper pulp processing method comprises the steps that lipase which is 0.001-0.5% of paper pulp dry weight is added into paper pulp with the pulp concentration which is adjusted in a range from 2% to 5%, and then the processed pulp is filtered, centrifuged and detected; and a white water processing method comprises the steps that lipase which is 0.001-0.5% of white water weight is added into papermaking white water for processing, and then the processed white water is filtered, centrifuged and detected. The method utilizes lipase to degrade the stickies thoroughly and reduce the deposition trend of the stickies, so that the removal purpose is achieved, and the problem of secondary sticky pollution is thoroughly solved; and the operation is simple, the removing effect is remarkable, the waste paper papermaking quality is improved, and the production cost is 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): D21C9/08
Inventor 裴继诚郭宏明
Owner TAIXING YIMING BIOLOGICAL PRODS