Stewing method for preparing bamboo wood dissolving pulp

Abstract

The invention belongs to the technical field of dissolving pulp preparation and relates to a stewing method for preparing bamboo wood dissolving pulp, which comprises the following steps of: (a) introducing vapor to a boiler: preparing bamboo wood raw materials into slice materials, conveying the slice materials to a digester, and introducing low pressure vapor to the digester while conveying theslice materials; (b) vapor heating and pre-hydrolyzing: heating through the vapor after introducing the vapor to the boiler to pre-hydrolyze the slice materials; (c) neutralizing through white liquor: neutralizing the slice materials and vapor condensed water in the digester through the white liquor in a hot white liquor tank; (d) replacing through hot black liquor: replacing the neutralization liquid waste in the digester through the hot black liquor in a hot black liquor tank; (e) heating and stewing in a temperature control manner to prepare virgin pulp of the bamboo wood dissolving pulp; (f) replacing the washing black liquor, washing and cooling the virgin pulp; and (g) discharging at a low temperature. The invention has the advantages of reducing the production cost, increasing the production efficiency, effectively utilizing the stewing heat and improving the yield and the quality of the bamboo wood dissolving pulp.

Description

technical field [0001] The invention belongs to the technical field of preparing bamboo dissolving pulp, in particular to a cooking method for preparing bamboo dissolving pulp. Background technique [0002] Dissolving pulp is a high-purity refined pulp, mainly used for the production of fiber derivatives such as textile viscose fiber, nitrocellulose, acetate fiber, cellophane, carboxymethyl cellulose, etc. Dissolving pulp has a wide range of uses, and the market demand larger. [0003] Existing dissolving pulp is mainly cotton and wood dissolving pulp prepared from cotton linters, coniferous wood and hardwood as main raw materials. As the planting area of ​​cotton is decreasing year by year, the output of cotton linters is also decreasing year by year, and forest resources such as coniferous wood and broad-leaved wood are also greatly reduced due to factors such as ecology and environmental protection. Therefore, the existing cotton and wood dissolving pulp are mainly impo...

AI Technical Summary

Problems solved by technology

[0005] The preparation method and equipment level of the existing bamboo dissolving pulp are relatively backward. In the cooking method, medicinal liquid and a large amount of water need to be added, the production cost is high, and there are low production efficiency, low heat energy utilization rate, unstable product quality, and environmental protection. Difficult to reach standards and other issues