Production method and applications of compound enzyme liquid used in papermaking and pulping process of wheat straws and rice straws

Abstract

The invention discloses a production method of a compound enzyme liquid used in the papermaking and pulping process of wheat straws and rice straws. The production method is characterized by comprising the steps of weighing each component enzyme, mixing and compounding all the component enzymes in a compounding pot, performing corrosion prevention, inspecting, packaging, and storing in a warehouse with the temperature of 5 DEG C, wherein the component enzymes are alkaline pectinase and xylanase, or are alkaline pectinase, xylanase, mannose and ligninase. The application of the compound enzyme liquid in the papermaking and pulping process of wheat straws and rice straws comprises the following steps: papermaking raw materials are pre-treated and then sent into a digester for enzyme treatment, namely the raw materials are soaked with the compound enzyme liquid, wherein the enzyme treatment conditions are as follows: the temperature ranges from 40 DEG C to 60 DEG C, the mass ratio of an absolute dry raw materials to the compound enzyme liquid is 100:(1.2-1.8) and the enzyme soaking time ranges from 20 minutes to 60 minutes; after enzyme treatment, the papermaking raw materials are digested in the digester. Each component enzyme in the compound enzyme liquid is high in activity but has no activity to crystalline cellulose and carboxymethyl cellulose; and compared with the traditional chemical pulping method, the production method has the advantages that the use amount of alkali is lowered by about 50%, the content of COD (Chemical Oxygen Demand) in waste water is lowered by over 30%, the production cost is lowered by about 20% and the quality of paper products is enhanced.

Description

technical field [0001] The present invention relates to a kind of papermaking pulping, specifically a kind of wheat straw, rice straw papermaking pulping, particularly relate to a kind of production method and application of compound enzyme liquid for wheat straw, rice straw papermaking 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. my country is a large agricultural country with rich crop straw resources and low prices. Therefore, wheat straw and rice straw have become one of the main papermaking raw materials in my country. It can not only make up for the shortage of papermaking r...

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