Preparation of Poly ethersulf one Polyamide Composite Nanofiltration Membrane for Effective Separation of Ammonium Citrate and Ammonium Sulfate Mixed Salts
The separation of ammonium citrate and ammonium sulfate is a common and difficult mixed salt in the treatment of white carbon black and coal gangue tailings.Currently,conventional methods such as distillation and chemical precipitation are difficult to achieve effective separation of these two salts.Membrane separation method,as a new method for separation of mixed inorganic salts,has the characteristics of low energy consumption and high efficiency.In this paper,polyethersulfone is used as the base membrane material,m-phenylenediamine and pyromelyl chloride are used as the reaction monomer,and interfacial polymerization reaction takes place on the polyethersulfone base membrane.With the separation efficiency of ammonium citrate and ammonium sulfate as the index,the concentration of membrane casting solution,gel bath temperature,the effect of the concentration of m-phenylenediamine and the amount of acyl chloride added on the flux and retention rate of the nanofiltration membrane indicates that the prepared polyamide composite nanofiltration membrane has high separation efficiency.This study provides a useful reference for the separation of salts with different valence states using nanofiltration membranes,and has good engineering demonstration significance.
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