A continuous membrane treatment method for alkali press liquid in viscose fiber production process

Abstract

The invention relates to a continuous membrane treatment method for alkali squeeze liquid in the viscose fiber production process, including the steps of material preparation, feeding, and system operation; wherein, in the process of system operation, a cleaning step is also included: the first stage The nanofiltration membrane module is switched out from the nanofiltration membrane system for cleaning, other nanofiltration membrane modules are operating normally, and the alkali squeeze liquid or the concentrated liquid produced by the upper nanofiltration membrane module skips the cleaning nanofiltration membrane module. After cleaning, the nanofiltration membrane module is connected back to the nanofiltration membrane system in series; and so on, the nanofiltration membrane modules at all levels are cleaned separately. The invention is a set of continuous membrane treatment process with automatic operation and cleaning, which changes the batch intermittent operation mode adopted by the traditional technology, can effectively improve the utilization rate of the nanofiltration membrane, reduce the cleaning times of the nanofiltration membrane, and prolong the service life of the nanofiltration membrane .

Description

Technical field [0001] The present invention relates to a method for processing a continuous film of viscose fiber production process for a base squeezed liquid, it belongs to the field of production of viscose fibers. Background technique [0002] At present, viscose staple fiber manufacturer in the alkali treatment process, the nanofiltration membrane system commonly used alkaline solution filtered to remove hemicellulose, reducing the hemicellulose content of the lye recycled again. Conventional batch operating mode is intermittent operation, such a mode of operation not only time consuming, and each processing tank 2 for an alkali pressate washed once stopped. Due to this operation mode at the beginning of the net flux was large, and with the concentrated hemicellulose, reduced net fluid flux, fouling and easier nanofiltration membrane, resulting in attenuation, affect the filtering effect. Inventive content [0003] The present invention is directed to the shortcomings of t...

AI Technical Summary

Problems solved by technology

The traditional operation mode is batch batch operation, which is time-consuming and labor-intensive, and needs to be shut down for cleaning once every two tanks of alkali squeezed liquid are processed

Due to this kind of operation mode, the net liquid flux is relatively large at the beginning, but with the concentration of the semi-fiber, the net liquid flux decreases, and the nanofiltration membrane is easy to be fouled, causing attenuation and affecting the filtration effect

Images