Post-processing method for squeezed alkali liquid in diffusion dialysis recycling viscose manufacture

Abstract

The invention relates to a post-processing method for squeezed alkali liquid in diffusion dialysis recycling viscose manufacture, and belongs to the technical field of viscose manufacture. The post-processing method comprises the following steps: performing filtration preprocessing for the squeezed alkali liquid; then performing cation exchange membrane diffusion dialysis processing; post-processing the recycling liquid with low hemicelluloses content and residue liquid with high hemicelluloses content both obtained through separation, wherein the post-processing refers to concentrating or attenuating the recycling liquid with low hemicelluloses content to retrieve alkali liquid, and neutralizing the residue liquid with high hemicelluloses content to obtain the hemicelluloses. The preprocessing technology aims at the diffusion dialysis technology for recycling the viscose squeezed liquid, and adopts filtration preprocessing method to process the squeezed alkali liquid; the preprocessing technology performs post-processing for the recycling liquid with low hemicelluloses content and the residue liquid with high hemicelluloses content respectively, the obtained recycling liquid, through concentration or attenuation, can be used in the alkali-requiring process in the viscose manufacture, and meet the alkali-requiring index requirement of the process.

Description

technical field [0001] The invention relates to a method for material treatment in chemical production, more specifically, the invention relates to a post-treatment method for squeezing lye in the production of recycled viscose fiber by diffusion dialysis, which belongs to the technical field of viscose fiber production. Background technique [0002] In the viscose fiber production process in the chemical fiber industry, an alkaline liquid containing a high concentration of organic matter (mainly hemicellulose) will be produced. If it is allowed to be discharged directly, it will cause serious environmental pollution. If the lye is treated by neutralization, a large amount of acid will be consumed, and a large amount of inorganic salt will be formed in the lye, so the alkali in the lye is recovered, and the organic matter in it can be harmless Disposal of solid matter is a more environmentally friendly disposal method. [0003] Viscose staple fiber is a cellulose reprocess...

AI Technical Summary

Problems solved by technology

[0016] The present invention aims to solve the existing problems and defects of the existing diffusion dialysis technology applied in the production of viscose fiber to recover the squeezed lye, and to provide a post-treatment method for the squeezed lye in the recovery of viscose fiber by diffusion dialysis. For the diffusion dialysis process applied to the recovery of viscose fiber squeezed lye, the squeezed lye is treated with a pretreatment method, and then enters the diffusion dialysis process to improve the recovery rate of alkali and hemicellulose in the pressed lye and reduce the impact of lye on The damage of the diffusion dialysis membrane system can improve the service life of the membrane, and ensure the smooth progress of the diffusion dialysis and subsequent processes, and this post-treatment method can recover the lye and hemicellulose separately, and can accurately and efficiently obtain suitable for various processes. Alkali Concentration Requirements

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