膜科学与技术

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Membrane absorption technology to recover and reuse ammonia based on the principle of direct contact membrane distillation in ammonia soda process

Authors： SUN Wei, GAO Qijun, LU Xiaolong, CHEN Huayan, WU Chunrui, WANG Xuan, JIA Yue

Units： State Key Laboratory of Separation Membranes and Membrane Processes, Institute of Biological and Chemical Engineering, Tianjing Polytechnic University, Tianjing 300387, China

KeyWords： membrane absorption；direct contact membrane distillation；recovery of ammonia；rate of water content；ammonia soda

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2016,36(3):118-123

Abstract：

In the process of ammonia soda, the condensate produced by ammonia cooling tower is usually distilled into the ammonia distillation tower again in order to recover ammonia, which increases the energy consumption. Ammonia with high water content was reused in ammoniating process, which decreases the concentration of refined brine, thus preventing sodium utilization rate from enhancing. In the paper, refined brine is used as absorbent. Membrane absorption（MA）technology to recover and reuse ammonia based on the principle of direct contact membrane distillation (DCMD) is studied. Ammonia in simulated condensed ammonia solution is transferred to refined brine, at the same time, mass transfer of water vapor whose direction of mass transfer is the same as ammonia is inhibited. So the rate of water content of ammonia recovered and reused is reduced and heat of phase transition produced by vaporization of water is saved. The influence of internal diameter (ri) of PVDF hollow fiber hydrophobic membrane used in the MA module, packing density (δ) of module and the temperature difference (△T) of absorbent and feed between inlet of shell and that of tube on the performance of MA to recover and reuse ammonia is studied experimentally. When ri is 0.80mm, δ is 16.8%, and △T is 9℃, the fiux of ammonia is 1.17 kg•m-2•h-1 and the fiux of water is only 0.04 kg•m-2•h-1, indicating that the technology is feasible.

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AuthorIntro：

第一作者简介：孙伟（1988-）男，河南鹤壁市人，硕士生，从事新型膜吸收过程研究. *通讯作者，E-mail：gqj2005@aliyun.com；luxiaolong@263.com

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