Process for pulping by biochemical solvent

Abstract

The invention relates to a technology for pulping with biochemical solvent, with the technical course: use the nonwood fiber plant as the raw material, scatter it and clear the mixture away, through pulping, disc mill, potching and pulp washing to be the product brei. It has the characteristics that the pulping course is immersing the scattered material into biochemical solvent for 2-2.5h under the general temperature and pressure, it has simple technique convenient operation, low cost, and no pollution.

Description

technical field [0001] The invention relates to the technical field of papermaking, in particular to a biochemical solvent pulping process. Background technique [0002] Straw pulp papermaking has a long history. For a long time, since wheat straw and other plant straws are much more abundant than wood resources, and the price is low, my country's paper industry has always used non-wood fibers as the main raw material, that is, straw pulp accounts for more than 85% of the entire papermaking raw materials. [0003] At present, the techniques for pulping with forage mainly include: caustic soda method, sulfate method, ammonia method, etc., and the caustic soda method is the main method. Finished pulp is obtained after disc grinding, bleaching, and pulp washing. However, during the caustic soda pulping process, a large amount of alkali-containing colloidal black liquor will be produced. This kind of alkali-containing colloidal black liquor is very difficult to handle at night ...

AI Technical Summary

Problems solved by technology

[0003] At present, the techniques for pulping with forage mainly include: caustic soda method, sulfate method, ammonia method, etc., and the caustic soda method is the main method. Finished pulp is obtained after disc grinding, bleaching, and pulp washing. However, during the caustic soda pulping process, a large amount of alkali-containing colloidal black liquor will be produced. This kind of alkali-containing colloidal black liquor is very difficult to handle at night, and it is easy to cause environmental pollution.

Traditionally, there are three kinds of black liquor treatment methods, namely, acid analysis lignin method, alkali analysis lignin method and incineration soda recovery treatment method. Practice shows that these three methods cannot fundamentally solve the pollution problem

In particular, the recovery and treatment of soda incineration has been practiced in my country for nearly 20 years, and it can also be called a mature technology. However, this method has too much investment and low income, which is difficult for ordinary enterprises to bear, and it cannot fundamentally solve the problem. Environmental pollution, so in order to protect the environment, our country had to limit the development scale of straw pulp, forcing more than 8,000 small paper mills across the country to shut down and switch over, causing huge economic losses, and at the same time causing a lot of waste of forage resources