Ultrahigh-viscosity refined cotton production process

Abstract

The invention discloses an ultrahigh-viscosity refined cotton production process. The specific production process comprises the step a of material selection and cotton opening, the step b of soaking, the step c of pretreatment, the step d of digesting, the step e of bleaching and the step f of grinding and drying. In the step d, pretreated alkali fibers are placed into an airtight spherical digester, and the temperature in the spherical digester is raised; next, the spherical digester is rotated in an idle mode, the temperature is raised again while the spherical digester is rotated, and the pressure is controlled to range from 0.20 MPa to 0.22 MPa; next, rotation of the spherical digester is stopped, a small amount of steam is released for 10 minutes, and a part of oxygen in the spherical digester is discharged to prevent oxidation and viscosity reduction; next, the temperature is raised again while the spherical digester is rotated, and the pressure is controlled to range from 0.25 MPa to 0.28 MPa; lastly, a large amount of steam is released after the temperature is kept for 30 minutes, alkali liquor is recovered, and cotton slurry is poured out when the temperature drops to 100 DEG C. The ultrahigh-viscosity refined cotton production process has the advantages that the use amount of the alkali liquor is reduced, the use cost of the alkali liquor is effectively lowered, and the requirement for improving the ultrahigh viscosity of products is met.

Description

technical field [0001] The invention relates to the technical field of refined cotton production technology, more specifically relates to the technical field of ultra-high viscosity refined cotton production technology. Background technique [0002] Refined cotton, also known as cotton pulp, is a white cotton fiber refined from cotton linters through processes such as cotton opening, cooking, rinsing, and drying. It is non-toxic, tasteless and easy to absorb water. It is the main material for the manufacture of ether cellulose, nitrocellulose and cellulose acetate. It is widely used in food, medicine, daily chemicals, plastics, electronics, papermaking, metallurgy, aerospace and many other fields. , Known as "special industrial monosodium glutamate". Under the premise of reaching a certain whiteness, the higher the viscosity of refined cotton, the better, which is more conducive to the production of high-viscosity products by cellulose manufacturers. However, the current p...

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Problems solved by technology

However, the current process for producing high-viscosity refined cotton cannot produce products with a viscosity range of more than 2200. The main reasons are that, firstly, before the cooking process in the production process, the alkali soaking and pretreatment process of raw materials are not enough. Reasonable, so that the lye does not fully penetrate into the cotton linters, which is not conducive to the subsequent cooking treatment; second, the cooking process is simple, and a suitable cooking process is not well established according to the characteristics of the cotton linters; the third is bleaching In the process, the use of hydrogen peroxide as a bleaching agent will greatly affect the increase in product viscosity