Preparation method for neutral esterase, and stickies control enzyme reagent used for waste paper papermaking process

A technology of esterase enzyme and esterase, which is applied in the field of glue control enzyme reagent and neutral esterase preparation, can solve the problem of no obvious reduction in catalytic activity, achieve multiple longitudinal split opportunities, protect fibers, and surface stickiness Reduced effect

Inactive Publication Date: 2019-07-02
JIAXING ZHUOSHENG BIOLOGICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the esterase Est from the thermophilic archaea Pyrobaculum calidifontis VA1 has no significant decrease in its catalytic activity when incubated at 100°C for 2 hours and in the presence of 80% organic solvent for 1 hour.

Method used

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  • Preparation method for neutral esterase, and stickies control enzyme reagent used for waste paper papermaking process
  • Preparation method for neutral esterase, and stickies control enzyme reagent used for waste paper papermaking process
  • Preparation method for neutral esterase, and stickies control enzyme reagent used for waste paper papermaking process

Examples

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preparation example Construction

[0032] In waste paper raw materials, stickies mainly come from hot-melts, pressure-sensitive substances, sizing agents, coating stickies and ink residues in waste paper. These substances are mainly composed of polyacrylate, polyacetate, etc. Vinyl ester etc mixed with other impurities. They link together the basic structural components of the stickies through ester bonds. At the same time, due to the negative charge of the sticky matter in the pulp system, it can absorb various cationic substances, so it is easy to block the mesh, appear paper holes, produce anion garbage, cause paper breakage and paper machine damage during the pulping and papermaking process. downtime etc. The neutral esterase (Esterase) can hydrolyze polyacrylate and polyvinyl acetate to become water-soluble low-molecular-weight alcohols, thereby reducing the polymerization of stickies and achieving the purpose of decomposing stickies. In the present invention, the neutral esterase is prepared by fermenta...

example 1

[0051] Example 1: The factory uses recycled OCC to produce liner paper, and the sticky substance control enzyme is added after refining. The effect is as follows:

[0052] Table 1: Comparison of the effects of liner paper before and after adding stickies to control enzymes

[0053]

[0054] It can be clearly seen from Table 1 that when the sticky matter control enzyme is added, the steam consumption per ton of paper drops significantly. This is because the sticky matter control enzyme hydrolyzes most of the stickies in the pulp, making the pulp The water filtration capacity is improved, and the sticky matter on the drying cylinder is reduced, thereby reducing the steam consumption per ton of paper.

[0055] Factory application example two:

[0056] On April 28, 2017, a paper co., Ltd. in Huadu, Guangzhou began to try the sticky matter control enzyme. As of June 2, after 35 days of continuous application tests, corresponding results have been achieved. The specific applicat...

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Abstract

A preparation method for neutral esterase, and a stickies control enzyme reagent used for a waste paper papermaking process are disclosed. The stickies control enzyme reagent used for the waste paperpapermaking process includes, by weight, the following components: 50%-60% of the neutral esterase (enzyme activity>=10000 u / ml), 10%-15% of endoglueanase (enzyme activity>=5000 u / ml), 15%-25% of lipase (enzyme activity>=200 u / ml), and 20% of a stabilizer; ad wherein, the neutral esterase is prepared from fermentation of bacillus cereus. A stickies control enzyme provided by the invention can effectively hydrolyze vinyl acetate (PVAc) to make the vinyl acetate become a water-soluble low molecular substance. A hydrolyzed product can be stably dispersed on a fiber surface, and the surface viscosity is lowered, so that the possibility of agglomerating into large stickies particles is greatly reduced, and the particles can be attached to the fiber surface and taken out of a system with paper without causing quality losses of the paper, thereby enabling a phenomenon that stickies affects production to be effectively controlled. The invention also includes the preparation method of the neutral esterase.

Description

technical field [0001] The invention belongs to the technical field of waste paper recycling, in particular to a preparation method of neutral esterase and an enzyme reagent for controlling stickies used in the papermaking process of waste paper. Background technique [0002] At present, domestic environmental protection is tightened, restricting the import of foreign waste paper such as American waste, and at the same time strict requirements are imposed on solid waste treatment methods. Moreover, when papermaking enterprises that use waste paper to pulp reuse the solid waste generated into paper, as the number of reuses increases, the proportion of waste paper raw materials supplemented with primary fibers or secondary fibers will gradually decrease, resulting in waste paper. The viscous substance in it increased dramatically. These adhesive substances mainly come from hot-melt substances, pressure-sensitive substances, sizing agents, coating adhesives and ink residues in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12N9/16C12N1/20D21C5/00D21C5/02C12R1/085
CPCC12N9/16C12N1/20D21C5/02D21C5/005Y02W30/64
Inventor 庄冉郝志军周广军
Owner JIAXING ZHUOSHENG BIOLOGICAL TECH CO LTD
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