Method for preparing bamboo dissolving pulp by improved prehydrolysis alkaline process and product thereof

Abstract

The invention relates to a method for preparing bamboo dissolving pulp by improved prehydrolysis alkaline process, which comprises the following steps of: bamboo material preparation, in which bamboo is made into bamboo sheets and bamboo threads, the bamboo sheets and threads are washed to remove impurities and dust; pretreatment, which is for removing more organic and nonorganic impurities, and in which the loss of pentosan is less than 2 percent; prehydrolysis, which is carried out at an acid concentration of sulphuric acid and hydrochloric acid of 0.1 to 10.0 weight percent, a temperature of between 80 and 14 DEG C and a liquor ratio of 1:4-15 for 30 to 400 minutes; and alkaline process. The method has the advantages that: the performance index of the bamboo dissolving pulp meets the requirements of viscose fibre pulp and the like; the improved prehydrolysis process allows the major part of pentosan in the bamboo to be hydrolyzed; the hydrolysate can be used as a raw material for xylose, xylitol, L-Arabinitol, ethanol and other products; the improved prehydrolysis process lays a good foundation for cooking and improving the reaction performance of the dissolving pulp; little production cost is added, the treatment load and cost of waste are reduced with the recovery of the products of the prehydrolysis, and the comprehensive cost is the lowest; and the comprehensive utilization of the components of biomass is realized during the pulping process of the dissolving pump.

Description

technical field [0001] The invention relates to the fields of chemical engineering, hydrolysis technology and dissolving pulp manufacturing technology, in particular to an improved prehydrolysis alkali method for manufacturing bamboo dissolving pulp and its products. Background technique [0002] Lignocellulosic raw materials are mainly used in pulp and dissolving pulp, the latter including viscose fiber pulp, cellulose acetate dissolving pulp, nitrocellulose dissolving pulp and cellulose ether dissolving pulp. Viscose fiber pulp is one of the most important varieties. The viscose fiber pulp industry has formed a complete raw material and technology system after nearly a hundred years of development. In recent years, with the rapid expansion of market demand and fiber production capacity, domestic viscose fiber pulp consumption has also increased significantly, and a large amount of wood pulp needs to be imported every year, and the bottleneck contradiction of raw materials ...

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