Commonly used chemical pulping methods are

Common chemical pulping methods are as follows:

Chemical pulping is a production process that converts wood, grass and other plant fiber raw materials into pulp by chemical methods.

1. Sulfate method:

Sulfate method is a traditional chemical pulping method, and its main feature is that sulfate is used as catalyst. Kraft process can produce pulp with good fiber quality, high strength and high yield. However, the sulfate process will produce a lot of sulfate waste liquid in the production process, which will have a certain impact on the environment.

2. Sulfite method:

Sulfite method is an improved method of sulfate method, with sulfite as catalyst. Compared with sulfate method, sulfite method has the following advantages: the waste liquid produced in the production process is easy to treat and has less pollution; The pulp has good quality and high strength; High yield.

3. Alkaline method:

Alkaline pulping is a chemical pulping method using alkaline catalyst. The pulp fiber produced by alkali method has good quality, high strength and high yield. The waste liquid produced in the process of alkali production can be recycled to reduce the impact on the environment.

4. Oxidation method:

Oxidation method is a new chemical pulping method, which is characterized by using oxidant as catalyst. Oxidation method has the advantages of less pollution, good pulp quality and high yield.

5. Biological pulping method:

Bio-pulping is a new chemical pulping method, and its main feature is to convert plant fibers into pulp by microbial fermentation with biotechnology. Biological pulping has the advantages of less pollution and low production cost.

6. Ammonium salt method:

Ammonium salt method is a chemical pulping method with ammonium salt as catalyst. Ammonium salt method has the following advantages: the waste liquid produced in the production process is easy to treat and has less pollution; The pulp has good quality and high strength; High yield.

The above are commonly used chemical pulping methods, each of which has its own characteristics and advantages, and can be selected according to specific production needs. It should be noted that no matter which chemical pulping method is adopted, we should pay attention to environmental protection and reduce the impact on the environment.