A kind of cleaning preparation method of high-purity and high-quality bamboo dissolving pulp

Abstract

The invention discloses a clean preparing method for high-purity and high-quality bamboo dissolving pulp. The clean preparing method includes the sequentially-implemented following steps: A, pulping processing is carried out on natural-color sulfate bamboo pulp boards through a double-drum pulper, wherein the pulping temperature is controlled to range from 80 DEG C to 95 DEG C, and the pulping concentration ranges from 18% to 30%; B, combined processing in which high-temperature acid processing and chelating processing are combined is carried out on pulped pulp materials, wherein first acid and steam are added into the pulped pulp materials for the high-temperature acid processing, then washing is carried out, and chelating agents and second acid are added into the washed pulp materials for the chelating processing; C, oxygen bleaching is carried out on the pulp materials obtained after the combined processing; D, the pulp materials obtained after oxygen bleaching are screened; E, D0EOPD1 three-stage clean bleaching processing including chlorine dioxide primary bleaching, EOP bleaching and chlorine dioxide secondary bleaching is carried out on the screened pulp materials, and the high-purity and high-quality bamboo dissolving pulp is obtained.

Description

technical field [0001] The invention relates to the technical field of chemical dissolving pulp production, in particular to a clean preparation method for high-purity and high-quality bamboo dissolving pulp. Background technique [0002] my country is the largest producer of textiles and raw materials in the world. In the domestic dissolving pulp market, the consumption of viscose fiber accounts for about 90% of the total demand for dissolving pulp, the consumption of acetate fiber accounts for about 7%, and the consumption of other products accounts for about 3%. %. In recent years, due to the growth of population and the development of urbanization, the consumption of resources has increased rapidly, especially in the fields of textile viscose, acetate, nitrocellulose and cellulose ether. The consumption of raw materials has also increased rapidly, but the production capacity is limited Expansion is extremely limited, which leads to a serious imbalance between demand and ...

AI Technical Summary

Problems solved by technology

[0008] To sum up, domestic dissolving pulp production enterprises currently generally have the problem of insufficient cotton and wood raw materials, and most of the existing wood dissolving pulp is imported, while the existing dissolving pulp production enterprises generally have long production cycles and labor-intensive production. Large, low production efficiency, limited production capacity, low pulp yield (the final product dissolving pulp yield is less than 30-35%), low raw material utilization rate, large investment, unstable final product dissolving pulp quality and product use Single and other deficiencies not only limit the control of production costs and the increase of profits of enterprises, but also the pollution of the environment by the waste water produced in the production process is quite serious (there are two main sources of pollution discharge: one is the liquid phase pre-hydrolyzed waste liquid, and the waste water after hydrolysis The waste liquid treatment is difficult; the second is the traditional bleaching wastewater, which has a large amount of wastewater, heavy pollution load and contains a large amount of AOX that is carcinogenic, teratogenic, and mutagenic to organisms, which seriously affects the ecological environment of humans and other organisms. ), in addition, steam pre-hydrolysis treatment is also prone to uneven hydrolysis and the difficulty of removing xylan, extracts and ash, and even local coking, which not only affects the smooth implementation of the entire preparation process, but also affects the finished product quality of dissolving pulp