Mixed neutral cellulase, preparation method thereof and application thereof to papermaking beating

Abstract

The invention discloses a mixed neutral cellulase, and belongs to the field of enzymatic preparations. The mixed neutral cellulase comprises, in parts by weight, 10-40 parts of cellulase, 20-30 parts of acidic xylanase, 5-10 parts of pectase, 3-8 parts of mannanase and 2-8 parts of a Chinese herbal medicine powder. According to the prepared mixed neutral cellulase, the active components of the Chinese herbal medicine powder is effectively utilized, a special method is utilized to overcome the disadvantage that conventional acidic xylanase is fermented by employing a single bacterial strain; compared with unprocessed pulp, beat pulp processed by the mixed neutral cellulase is improved in beating degree by 11.76%, improved in short fiber burst index by 11.98% and improved in ring crush index by 13.99%; the beat pulp processed by the mixed neutral cellulase is improved in long fiber pulling force index by 40.17% and improved in tear index by 58.91%; the beat pulp processed by the mixed neutral cellulase has relatively smooth fiber surface and relatively soft enzyme fiber; paper made from the beat pulp processed by the mixed neutral cellulase is improved in tear index by 8.3%, improved in tensile index by 10.6% and improved in burst index by 16.5%; and paper pulp whiteness is improved by 2%-5%, sewage quality is substantially improved, and environmental pollution degree is reduced.

Description

Technical field: [0001] The invention belongs to the field of enzyme preparations, in particular to enzymes used in the field of pulp and papermaking. Background technique: [0002] The pulp and paper industry is one of the important pillar industries of the national economy, but it is also a major contributor to resource consumption and environmental pollution such as forests, energy, and chemicals. The global paper industry cuts down hundreds of millions of cubic meters of trees every year, and about half of them are turned into waste and discharged back into the surrounding atmosphere and water flow, which poses a huge threat and harm to the ecological environment of human existence. Reducing energy and chemical consumption, increasing pulp yield, and biological treatment of sewage are all fundamental ways to overcome the above difficulties. And biotechnology can do a lot in these areas. [0003] Cellulase is a complex enzyme system composed of various hydrolytic enzyme...

AI Technical Summary

Problems solved by technology

[0012] The technical problem solved by the present invention is to overcome the defect of large waste discharge in the existing pulping and papermaking technology, and use a mixed neutral cellulase to decompose the inside of the cellulose to promote the separation of fibers in the pulping process Blending makes beating easier, thereby saving beating energy consumption, and improving the white water circulation rate, thereby reducing the consumption of raw pulp per ton of paper and the amount of clean water, and improving the quality of sewage