Production method and application of composite enzyme solution for papermaking and pulping of poplar wood chips

Abstract

The invention discloses a production method of a compound enzyme solution for poplar wood chip papermaking and pulping. The production method is characterized by comprising the step of storing all componential enzymes into a 5 DEG C storehouse after sequentially weighting, mixing and preparing in a complex preparation tank, preserving, checking and packing, wherein all the componential enzymes are respectively an alkaline pectinase, a xylanase, a mannase and a ligninase. The application of the compound enzyme solution to the poplar wood chip papermaking and pulping is as follows: the papermaking raw material is placed into a digester for enzyme treatment after being pretreated, i.e., the raw material is soaked by using the compound enzyme solution under the conditions that the temperature ranges from 40 DEG C to 60 DEG C, the mass ratio of the bone dry raw material to the compound enzyme solution is 100: (1.2-1.8), and the enzyme soaking time ranges from 30min to 80min; the raw material is digested in the digester after being subjected to enzyme treatment. The activity of each componential enzyme is high, and all the componential enzymes in the compound enzyme solution have no activity for crystalline cellulose and carboxymethyl cellulose; compared with the traditional chemical pulping method, the pulping method by using the compound enzyme solution has the advantages that the alkaline consumption is reduced by about 50%, the content of COD (Chemical Oxygen Demand) in wastewater is reduced by over 30%, the production cost is reduced by about 20%, and the quality of a paper product is improved.

Description

technical field [0001] The invention relates to papermaking and pulping, in particular to poplar wood chip papermaking and pulping, in particular to a production method and application of a composite enzyme solution for poplar wood chip papermaking and pulping. Background technique [0002] With the development of society and the improvement of people's living standards, the consumption of paper and paper products in my country is growing at a high speed, and it has become the second largest consumer market of paper and paper products in the world. In the world, 94% of papermaking raw materials are wood. Due to the lack of forest resources in my country, wood pulp mainly depends on imports. Poplar chips are also one of the important papermaking raw materials in my country. However, the traditional poplar chip chemical pulping process is seriously polluted, and the black liquor treatment is difficult and expensive. As a result, papermaking enterprises face greater environme...

AI Technical Summary

Problems solved by technology

[0005] 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 papermaking process that replaces the chemical pulping process with a biological fermentation pulping method; the publication number is CN1188830A, and the invention name is biological delignification-mechanical pulping technology and other patent applications all use microorganisms to directly process raw materials, and their main disadvantages There are: ⑴The cycle of biological treatment is long and usually takes a few days; ⑵The raw materials should be sterilized before microbial treatment, which increases the production cost and may reduce the quality of raw materials; ⑶It is difficult to effectively control the biological treatment process, and often occurs The quality uniformity of raw materials after biological treatment is poor, and carbohydrate degradation is serious, which leads to a decrease in pulping yield; (4) The quality uniformity of raw materials after biological treatment is poor, which directly affects the quality of pulping, thereby affecting the quality of the final product; (5) Using the above method to produce Compared with ordinary chemical pulp, the pulp has poor physical properties and bleaching properties, and cannot be used to produce high-brightness, high-strength paper, but can only be used to produce low-grade paper

[0006] Adopt enzymatic treatment of raw materials, such as publication number CN1616758A, the name of the invention is biological pulping process; publication number is CN1421570A, the name of the invention is patents such as the method for enzymatic pulping of grass raw materials, the main disadvantage of this technology is: The cost is high, and it does not have a cost advantage in industrial production; at the same time, it is difficult to control the damage of ligninase, xylanase, and hemicellulase to the corresponding components, and it may remove too much lignin, xylan, and hemicellulose. Affect pulp yield

However, its process is complex, and the raw materials need to be soaked in acid and alkali to be treated with enzymes, which has the following disadvantages: one is that the enzyme is single, and the time for soaking the enzyme is long; the other is that new equipment is needed to increase the cost; The steps of acid and alkali leaching add new pollution, which is not conducive to industrial production and use