Preparation method of wood pulp for fibranne

Abstract

The invention relates to a preparation method of wood pulp for fibranne. The method comprises a material preparation process, an alkali liquor preparation process, a spiral squeezing process, a stewing process, a washing process, an impurity removal process and a pulp copying process. The alkali liquor preparation process comprises the following steps of: controlling the temperature to be between 30 and 40 DEG C; and adding 3 to 4 percent of sodium hydroxide, 0.2 to 0.25 percent of boiling agent, 2.5 to 4 percent of hydrogen peroxide, 0.1 to 0.2 percent of anthraquinone and 0.1 to 0.2 percent of bioactivity complex enzyme according to oven dry stock amount respectively to obtain alkali liquor. The prepared wood pulp has high alpha cellulose content, high yield, high reactivity and low non-fibrous impurity content and meets the quality requirements of preparing fibranne; and by the method, the chemical oxygen demand (COD) content of discharged wastewater is 1,100 to 1,300 mg / l which belongs to low pollution, and pollution to the environment is reduced.

Description

technical field [0001] The invention relates to a pulping method, in particular to a method for preparing wood pulp for viscose staple fiber by using papermaking grade wood pulp as a raw material. Background technique [0002] Most domestic enterprises use cotton pulp as the raw material for viscose fiber production. The resources of raw cotton linters are increasingly in short supply due to the constraints of planting area and growth cycle. With the development of viscose fiber industry and the expansion of production capacity, the shortage of raw materials has restricted the development of my country's viscose fiber industry. For this reason, some enterprises have used dissolving wood pulp for viscose production, but the high price and shortage of imported dissolving wood pulp have affected the normal operation and economic benefits of the enterprise. Finding a substitute for dissolving wood pulp is an important task for enterprises . [0003] At present, my country impo...

AI Technical Summary

Problems solved by technology

[0004] (1) All adopt the two-stage pulping method of cooking and bleaching, the pulping process is cumbersome and complicated, and the energy consumption is high

[0005] (2) Chlorine chlorination and sodium hypochlorite bleaching are used for bleaching, which will produce organic halides and carcinogenic dioxins, which will pollute the environment and water sources

[0006] (3) Although the obtained wood pulp reaches the wood pulp index for viscose staple fiber, the content of non-fibrous impurities is high. In the production process of viscose staple fiber, the reaction performance is poor, and it is easy to form rubber particles and micelles. Plugging filter cloth cannot be used alone, it must be used in conjunction with a certain proportion of cotton pulp, the proportion generally cannot exceed 10%, and the viscose staple fiber produced has poor spinnability and cannot be compared with dissolving wood pulp

[0007] (4) The cooking section adopts high-temperature and high-alkali technology, which greatly damages the armor fiber