Pre-treatment method for pressed alkali liquor in manufacturing of recycling viscose by diffusion dialysis

Abstract

The invention relates to a pre-treatment method for pressed alkali liquor in manufacturing of recycling viscose by diffusion dialysis, which belongs to the technical field of viscose manufacturing. The method comprises the following steps: pressed alkali liquor with sodium hydroxide with the concentration of 50-200 g / L and hemicellulose with the concentration of 20-150 g / L is subjected to filtration treatment through a micropore membrane with the aperture of 0.1-1 mum firstly and then an ultrafiltration membrane with the aperture of 20-1000 A degree, so as to lower the density of large particle impurities, recycle lignose, and obtain pre-treatment liquid used for diffusion dialysis treatment of a cationic exchange membrane. Aiming at the diffusion dialysis technology applied to pressed alkali liquor for recycling viscose, the specific pre-treatment method is adopted to treat pressed alkali liquor and then allows the treated pressed alkali liquor to enter into diffusion dialysis process, so as to improve the recovery ratio of alkali and hemicellulose in the pressed alkali liquor, reduce the damage of alkali liquor for a diffusion dialysis membrane system, prevent diffusion dialysis membranes from blocking, improve the service life of membranes, and guarantee the smooth progress of the diffusion dialysis and subsequent processes.

Description

technical field [0001] The invention relates to a material treatment method in chemical production. More specifically, the invention relates to a pretreatment 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 reprocessed pro...

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 used in the production of viscose fiber to reclaim the squeezed lye, and to provide a pretreatment method for the squeezed lye in the production of viscose recovered by diffusion dialysis. For the cation exchange membrane diffusion dialysis process applied to the recovery of viscose fiber squeezed lye, a specific pretreatment method is used to treat the pressed lye with specific indicators, and then enter the cation exchange membrane diffusion dialysis process after obtaining a suitable pretreatment solution. Improve the recovery rate and amount of alkali and hemicellulose in the pressed lye, reduce the damage of lye to the diffusion dialysis membrane system, improve the service life of the membrane, and ensure the smooth progress of diffusion dialysis and subsequent processes

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