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Study on the supported gas membrane for ammonia removal by using hydrobromic acid as absorbent

Authors： LIU Yi, QIN Yingjie, XU Yuzhuang, JIA Yumeng, CAI Tenghao, YU Wenkai

Units： 1.School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350;2.The 718th Research Institute of CSSC, Handan, 056027;3.PureSea Spring Membrane Technology, Ltd., Tianjin 300350

KeyWords： supported gas membrane; PTFE hollow fibers; low surface tension; ammonia removal; hydrobromic acid

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2023,43(4):136-144

Abstract：

The supported-gas-membrane process was investigated for the removal/enrichment of ammonia from aqueous solution, by using membrane contactor made of microporous hydrophobic PTFE or PP hollow fibers and using dilute hydrobromic acid as the stripping solution, in order to obtain ammonium bromide as the by-product correspondingly. The influence of the operation conditions such as feed concentration, other electrolyte concentration in feed, surface tension of feed and pH value of the stripping solution on mass transfer performance were investigated, and the effects of feed with low surface tension on the performance stability of PTFE or PP membrane module were also tested. The experimental results showed that the volatility of hydrobromic acid did not affect the operational stability of PTFE and PP membrane modules at the low pH that the stripping solution provided the maximum mass transfer coefficient. The mathematical model based on mass transfer mechanism can describe well the influence of feed concentration, feed flow rate and pH value of the stripping solution on mass transfer. The highly concentrated electrolyte in the feed weakens the osmotic distillation phenomenon, for example, when the concentration of sodium bromide in the feed solution was as high as 15wt%, the enrichment ratio of ammonia in the final stripping solution was 41.25. In a long-term test of continuous operation for 6 months, PTFE membrane modules had shown good performance stability in dealing with the feed of low surface tension. However the mass transfer coefficient of PP modules decreased significantly within 10 days, with the mass transfer coefficient value decreased by 65%. This study lays a theoretical foundation for the industrial application of supported gas membrane and provides experimental data to remove/ recover ammonia from feed of low surface tension and to obtain ammonium bromide as a by-product.

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AuthorIntro：

刘一（1999-),男，山东泰安人，研究方向为新型膜分离技术，通讯联系人邮箱：yjqin@tju.edu.cn

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