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Method for improving papermaking quality by alkaline pectinase combined with chemical reagent degumming

A pectinase and alkaline technology, which is applied in the field of papermaking, can solve the problems of increasing the burden and cost of papermaking production, low physical properties and bleaching performance, and high cost of use, so as to improve retention and drainage performance, reduce cation demand, and reduce The effect of production costs

Active Publication Date: 2021-04-02
SHANDONG LONGKETE ENZYME PREPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using microorganisms to directly process raw materials, such as the publication number CN1683711A, the name of the invention is a papermaking biological pulping process; the publication number is CN1420229A, the name of the invention is a papermaking straw pulping process; A kind of papermaking process method that replaces chemical pulping process with biological fermentation pulping method, their main problems are: (1) microbial treatment needs special environment, as aseptic environment, temperature and humidity, ventilation rate controllable etc., this has just increased Production costs, and may cause certain damage to raw materials; (2) The microbial treatment process has certain limitations on the controllability of raw materials, which can easily lead to poor uniformity of raw materials after treatment and reduced pulping quality; (3) Microbial treatment Compared with ordinary chemical pulp, the physical properties and bleaching properties of the pulp produced are lower, which results in a lower grade of paper quality
Adopt enzyme preparation to process raw material, as publication number is CN1616758A, and the name of invention is biological pulping process; Publication number is CN1421570A, and the name of invention is the method for enzymatic pulping of grass raw materials, the main problems of this type of technology are: (1) Putting pure enzyme liquid into production has high cost and does not have a cost advantage in industrial production; (2) The degree of damage to the corresponding components of raw materials by pure enzyme liquid has not been effectively controlled at present, and there may be cases where too many corresponding components are removed. Reduce pulp yield
DCS substances have a high negative charge, which will preferentially combine with cationic retention aids, reducing the efficiency of retention aids, thereby increasing the burden and cost of papermaking production, and reducing the quality of papermaking

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In this embodiment, corn stalks are used as raw materials. First, the corn stalks are crushed into 3-5cm long filaments with a pulverizer, and the ratio of the absolute dry mass (g) of the corn stalks (g) to the water volume (mL) is 1:7-9 (the present embodiment is 10kg corn stalks). : 71L water), add water, adjust the pH value to 5.5 with concentrated sulfuric acid, heat up to 55°C, soak for 60min, filter, and rinse.

[0021] In order to reduce production cost, recycle slurry, reduce waste discharge and environmental pollution, the present invention pre-soaks pulping waste liquid for 35 minutes before cationic additive treatment after papermaking raw material pretreatment and acid treatment, and the residual alkali concentration in the waste liquid is 2.5 g / L.

[0022] Transfer the rinsed raw materials to the cooking pot, and then treat the slurry with three kinds of cationic additives: cationic talcum powder, cationic starch and cationic polyacrylamide (CPAM). Add 0...

Embodiment 2

[0028] Present embodiment is raw material with flax. First select flax with roots and tops removed, crush it into 6-8cm long segments, and use a ratio of 1:21 according to the absolute dry mass (g) of flax and the water volume (mL) (this embodiment is 10kg corn stalks: 210L water) add water to soak for 9 hours, adjust the pH value to 5.8 with concentrated sulfuric acid, raise the temperature to 65°C, soak for 70 minutes, filter and rinse.

[0029] Transfer the rinsed raw materials to a cooking pot, and then treat the slurry with three cationic additives: cationic talcum powder, cationic starch, and cationic polyacrylamide (CPAM). The addition amount of starch is 0.15%, the addition amount of cationic polyacrylamide is 0.07%, the cooking temperature is 50°C, the cooking time is 8min, and the mass ratio of dry raw material to water is 1:7.

[0030] Then add alkaline pectinase, the enzyme treatment conditions are: alkaline pectinase (enzyme activity 185U / mg), temperature 55°C, p...

Embodiment 3

[0035] Present embodiment is raw material with poplar. First peel the poplar and cut it into small pieces of 10-12cm long, add water to soak for 24 hours according to the ratio of the absolute dry mass (g) of poplar to the water volume (mL) of 1:40, and adjust the pH value to 5.5 with concentrated sulfuric acid , heated up to 65°C, soaked for 65 minutes, filtered, and rinsed.

[0036] Transfer the rinsed raw materials to a cooking pot, and then treat the slurry with three cationic additives: cationic talcum powder, cationic starch, and cationic polyacrylamide (CPAM). The addition amount of starch is 0.85%, the addition amount of cationic polyacrylamide is 0.02%, the cooking temperature is 65°C, the cooking time is 10min, and the mass ratio of dry raw material to water is 1:9.

[0037] Then add alkaline pectinase, the enzyme treatment conditions are: alkaline pectinase (enzyme activity 285U / mg), temperature 65°C, pH value 9.5, enzyme soaking time 150min, alkaline pectinase sol...

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Abstract

The invention belongs to the technical field of papermaking, and relates to a biochemical combined degumming papermaking pulping process, in particular to application of a synergistic effect of alkaline pectinase and a part of cation additives in papermaking pulping. According to the method, raw materials are soaked in the pulping waste liquid for a period of time after pretreatment and pickling treatment, and three selected cationic additives and alkaline pectinase are combined to act on the treated pulp, so that the demand (CD) of cationic additives in a system can be reduced by 49.51%, thewhiteness of the pulp can reach 81-87% and the breaking length can reach 6500-7400m after chlorine dioxide bleaching, the paper quality is improved, the use amount of alkali is reduced by 40-45%, andthe production cost is saved by 15-30%.

Description

Technical field: [0001] The invention belongs to the technical field of papermaking, and relates to a biochemical combined degumming papermaking and pulping process, in particular to the application of the synergistic action of alkaline pectinase and some cationic additives in papermaking and pulping. Background technique: [0002] The rapid development of the current society has brought great changes to the material consumption of all walks of life, and the demand for paper and paper products in social life and work is also increasing day by day. The high quality and low cost of paper and paper products has become the new goal of the paper industry. The traditional chemical pulping process has the disadvantages of high energy consumption, high risk, high cost, low yield, low strength of paper fiber, and easy to produce difficult-to-treat pollutants during the process. Biological pulping technology is a new pulping technology that has been valued by many professional schola...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/00D21C3/00D21C3/22D21H17/68D21H17/29D21H17/45D21H17/00
CPCD21C5/005D21C3/006D21C3/003D21C3/22D21H17/68D21H17/29D21H17/45D21H17/005
Inventor 张杰王金余葛志豪刘文龙王兴吉郭庆文
Owner SHANDONG LONGKETE ENZYME PREPARATION
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