Production method of refined cotton

Abstract

The invention belongs to the technical field of refined cotton production, and particularly relates to a production method of refined cotton; the invention can not only improve the quality of refined cotton products, but also reduce water and steam consumption, and can reduce acid water discharge. The method particularly comprises the following steps of: 1) boiling of cotton linter; 2) washing, wherein nitrocellulose acidic waste water is used for washing, and washing is performed till the pH of the cotton material is 6.5-7.5; 3) bleaching, wherein a sodium hypochlorite solution is used for bleaching; 4) acidification, wherein nitrocellulose acidic waste water is added during acidification to control the pH to be 1-5; 5) cold washing, wherein cold washing is performed with water. The nitrocellulose acidic waste water has a total acidity of 5-15 g / l, and comprises the following main components by weight: 0.003%-0.023% of sulfuric acid, 0.006%-0.018% of nitric acid, and the balance of water and impurities. The beneficial effect of the invention is that nitrocellulose acid water needing to be discharged is used to substitute concentrated sulfuric acid during the refined cotton production process, which avoids the carbonization of refined cotton by concentrated sulfuric acid, improves the quality of refined cotton, reduces water and consumption, reduces the discharge of nitrocellulose acid water, and saves the cost for nitrocellulose acid water treatment.

Description

technical field

[0001] The invention belongs to the technical field of refined cotton production, in particular to a production method of refined cotton. Background technique

[0002] At present, the production process of domestic refined cotton is: cotton linters opening→steaming→washing→bleaching→acidification→cold washing→drying, among which 98% concentrated sulfuric acid is used for washing and acidification of alkaline refined cotton, but It is not safe to use concentrated sulfuric acid in production. Concentrated sulfuric acid is easy to carbonize when it encounters refined cotton, and the discharge of acid water produced is large (22t / RC). When acidifying refined cotton, the difference in acid concentration is large, and the quality uniformity of refined cotton is poor. Usually, the product index is whiteness 78-81%, and ash content 0.15-0.19%. Although there are certain disadvantages in using concentrated sulfuric acid in the production process of refined cotton, co...