Clean pulping method of linters

Abstract

The invention relates to a clean pulping method of linters, which is a pioneering invention belonging to the field of environmental protection. The clean pulping method is technically characterized that the linters are conveyed into a stainless steel container I after the processing steps of cotton opening, dust removing and impurity removing; potassium base peroxide (details are disclosed in the patent of the utility model of 200620138146.3) manufactured by an ionic membrane exchanger on the spot is added for pretreatment; sundries such as waxiness, colloid, sugar, and the like in a slurry are cleared so as to improve the whiteness of the slurry to 60 percent ISO; the slurry is conveyed to a stainless steel container II, and peroxide and oxygen are added; under the catalysis of ultraviolet light and the temperature of 80 DEG C, hydroxyl free radicals and active oxygen free radicals are generated so as to break away chromophore groups and auxochromic groups in the slurry; hemicellulose and lignin in the slurry are further degraded, the polymerization degree of fibers is reduced, and the whiteness of the slurry is improved to 85 percent ISO; the slurry is conveyed to a stainless steel pressure container, and the temperature in the stainless steel pressure container is risen to 120 DEG C and preserved for 100 minutes so as to ensure that the polymerization degree is reduced to 50+ / -10; and through the processing steps of screening, deslagging, press-rolling and drying, qualified cotton pulp is manufactured. The whole process of the clean pulping method has no black liquor, no emission of waste water and waste slag and no poisonous and harmful substances.

Description

technical field [0001] The invention is a pioneering invention in the field of environmental protection. Background technique [0002] Traditionally, cotton linters are used to make cotton pulp, all using high temperature (160°C-180°C), high pressure (0.6mpa), high chemical dosage (sodium hydroxide 17-20%), and long-term cooking (4-6 hours). Hundreds of tons of clean water are needed to wash the black liquor. The COD content in the black liquor is 5,000 to 10,000 mg / L, which has a large pollution load and high viscosity. If the black liquor is discharged without treatment, it will seriously pollute the water source, and it is difficult to handle. Ton of pulp needs to increase sewage The processing cost is 500-800 yuan, and it is difficult to meet the national emission standards. After cooking, chlorine solution is used for bleaching, and the waste liquid is discharged directly, causing "dioxin" to pollute water, soil, and food, and directly endanger human health. Contents...

AI Technical Summary

Problems solved by technology

[0002] Traditionally, cotton linters are used to make cotton pulp, all using high temperature (160°C-180°C), high pressure (0.6mpa), high chemical dosage (sodium hydroxide 17-20%), and long-term cooking (4-6 hours). Hundreds of tons of clean water are needed to wash the black liquor. The COD content in the black liquor is 5,000 to 10,000 mg / L, which has a large pollution load and high viscosity. If the black liquor is discharged without treatment, it will seriously pollute the water source, and it is difficult to handle. Ton of pulp needs to increase sewage The processing cost is 500-800 yuan, and it is difficult to meet the national emission standards

After cooking, chlorine solution is used for bleaching, and the waste liquid is discharged directly, causing "dioxin" to pollute water, soil, and food, and directly endanger human health