用于柠檬酸铵和硫酸铵混合盐的有效分离的聚醚砜-聚酰胺复合纳滤膜制备

Preparation of Polyethersulfone Polyamide Composite Nanofiltration Membrane for Effective Separation of Ammonium Citrate and Ammonium Sulfate Mixed Salts

在白炭黑、煤矸石尾矿治理中,体系的柠檬酸铵和硫酸铵混合盐亟需分离,目前常规的方法如蒸馏法、化学沉淀法,难以实现这两种盐的有效分离。膜技术作为新兴的分离技术,具有低能耗、高效率的特点,本文以聚醚砜为基膜材料以间苯二胺和均苯三甲酰氯作为反应单体,制备聚醚砜-聚酰胺复合膜。以对柠檬酸铵和硫酸铵两种盐的分离效率为考察指标,利用正交实验考察铸膜液浓度、凝胶浴温度、间苯二胺浓度以及均苯三甲酰氯加入量对纳滤膜通量和截留率的影响,制备的聚酰胺复合纳滤膜具有较高的分离效率。本研究为利用纳滤膜分离不同价态的盐类提供了有益的参考,具有较好的工程示范意义。

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.