Continuous displacement and digestion process for dissolving pulp

Abstract

The invention relates to a continuous displacement and digestion process for dissolving pulp. By adopting the traditional vertical pot digestion equipment and combining a continuous digestion technology, a fiber raw material is prepared into the dissolving pulp (chemical fiber pulp), and the purposes of saving energy, protecting the environment, improving the yield and the quality and reducing the consumption are fulfilled. A plurality of digestion pots are adopted in the digestion process for the dissolving pulp, the digestion solution outlet of each digestion pot is directly communicated with the digestion solution displacement outlet of other each digestion pot through a pipeline, and random two or more digestion pots form closed circular connection; during working, the same process conditions are set in the digestion process of each digestion pot from filling completion to pot feeding, and three periods of displacement time of all the digestion pots are set to be the same; and by adjusting the time interval between the digestion pots, the displacement time is superposed, namely at least two pots are in the process of acid displacement, neutralization displacement or alkali reclamation displacement in the displacement time, the displacement time is superposed and continuous displacement is performed at the time superposition point.

Description

technical field [0001] The invention relates to a dissolving pulp continuous displacement cooking process, which adopts traditional vertical pot cooking equipment combined with continuous cooking technology to make fiber raw materials into dissolving pulp (chemical fiber pulp), and achieve energy saving, environmental protection, increase yield and quality, and reduce consumption the goal of. The invention belongs to the technical field of pulping in the textile industry. Background technique [0002] The main raw materials for the production of viscose fiber are cotton linter pulp and dissolving wood pulp. In recent years, due to factors such as the reduction of cotton planting area, the increase of cotton linter pulp is very small, so dissolving wood pulp has become the only raw material source for increasing viscose fiber. Dissolving pulp is relatively pure wood pulp and straw pulp after bleaching and extraction of organic solvents. It removes lignin and hemicellulose t...

AI Technical Summary

Problems solved by technology

[0012] Although this method effectively saves heat energy, a large-volume liquid storage tank is installed between each cooking pot, which will result in a larger workshop area and higher equipment investment

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