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A method and system for cleaning and filtering lye nanofiltration membrane

A technology of nanofiltration membrane and lye, which is applied in the field of cleaning, can solve the problems of no clear indication of cleaning results, mediocre cleaning effect, time-consuming and labor-intensive problems, and achieve the effect of changing cleaning methods, reducing operating costs and prolonging the service life

Active Publication Date: 2021-04-13
唐山三友集团兴达化纤有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the production process of viscose staple fiber, the method of cleaning and filtering the lye nanofiltration membrane mainly adopts the traditional hydraulic method or alkaline solution cleaning method. At present, this cleaning method is time-consuming and laborious, and requires more water or alkaline solution. There is no clear instruction on the cleaning results due to continuous long-term flushing, and experience judgment is needed when it ends, and the cleaning effect is average, but the cost is high

Method used

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  • A method and system for cleaning and filtering lye nanofiltration membrane

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Embodiment Construction

[0030] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0031] The production of viscose staple fiber includes the purification of squeeze liquid and the concentration of hemicellulose. The purification of squeeze liquid includes the removal of hemicellulose and other macromolecular substances in the squeeze liquid to obtain relatively pure lye; the squeeze liquid is viscose Produced in the short fiber production process, it needs to be filtered by nanofiltration membrane before being used in production. The concentration of hemicellulose includes cross-flow filtration of lye through nanofiltration membrane to obtain lye with high hemicellulose content; the squeezed liquid enters the nanofiltration membrane through a high-pressure delivery pump, and is driven by pressure ...

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Abstract

The invention relates to a method and system for cleaning and filtering alkali liquid nanofiltration membranes. The cleaning method comprises the following steps: using soft water to circulate and rinse the nanofiltration membranes until the pH value of the primary flushing liquid at the outlet of the nanofiltration membranes is neutral, draining Empty the first flushing liquid; rinse the nanofiltration membrane with acid solution for the second cycle until the pH value of the secondary flushing liquid is stable at 1-1.5, and then drain the secondary flushing liquid after 30 minutes of recirculation flushing; use soft water for three cycles Rinse the nanofiltration membrane until the pH value of the three rinses at the outlet of the nanofiltration membrane is greater than 6, and empty the rinses three times; wash the nanofiltration membrane with lye four times, and after 15 minutes of circular washing, drain the rinses four times, Cleaning is over. The present invention uses soft water, a certain concentration of acidic solution and a certain concentration of alkaline solution to clean the filter lye nanofiltration membrane in stages, remove the impurities trapped in the flow channel and pores of the nanofiltration membrane, change the cleaning method of the nanofiltration membrane, and recover The filtration capacity of nanofiltration membrane prolongs the service life of nanofiltration membrane and reduces operating costs.

Description

technical field [0001] The invention relates to a cleaning method and system, which are applied in the production process of viscose staple fiber, and in particular to a method and system for cleaning and filtering lye nanofiltration membranes. Background technique [0002] At present, domestic viscose staple fiber production enterprises generally use nanofiltration membrane system to filter and remove hemicellulose in lye in the process of lye filtration, reduce the content of hemicellulose, and recycle lye. When using nanofiltration membrane filtration equipment, after the equipment is put into use for a certain period of time, impurities and macromolecular substances in the lye will stay in the flow channels and pores of the nanofiltration membrane, thereby reducing the filtration capacity of the nanofiltration membrane. When the filtration capacity of the nanofiltration membrane cannot meet the production requirements, it is necessary to clean the nanofiltration membrane...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D65/02B01D61/02
CPCB01D61/027B01D65/02
Inventor 刁敏锐李铭远张卫民杜红莲徐瑞宾李长春王迎春岳春艳刘春英张荣生王永善马佳李伟卢方侯佳琪米丽颖李秋玲刘坤陆占波赵海涛
Owner 唐山三友集团兴达化纤有限公司
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