Dehumidification of simulated fluorine-containing water vapor by membrane method

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Abstract At present, the production of anhydrous hydrogen fluoride (AHF) from fluosilicic acid (15%) in phosphate fertilizer plants consumes a lot of concentrated sulfuric acid and other problems. Therefore, in this paper, a certain concentration of simulated fluorine-containing water vapor was obtained by heating and decomposition of a certain concentration of fluorosilicic acid solution, and a polysulfone hollow fiber membrane module was used to study the dehumidification, then a high concentration of fluorine-containing gas could be sent into the AHF production device. The study found that when the membrane pressure difference is 0.022 MPa, the fluorine content of the raw gas is 4.47%, and the separation time is 0.47 h, the permeation ratio of water vapor, HF and SiF₄ was 92.31%, 24% and 13.62%, respectively, and the separation coefficients of α_H₂O/HF, α_H₂O/SiF₄, and α_HF/SiF₄ were 3.85, 6.78 and 1.76, respectively. The results show that the polysulfone hollow fiber membrane can dehumidify and concentrate fluorine-containing water vapor to a certain extent, and the membrane has relatively stable separation performance for SiF₄. Water vapor has the highest permeation ratio, while SiF₄ has the lowest. And the polysulfone membrane has a relatively stable separation performance for SiF₄, the separation effect of non-polar gas (SiF₄) is good.

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	OU Jian
	LI Tianxiang
	LIU Songlin
	SUI Yanfeng
	SHI Lianjun
	ZHU Jing

Keywords： wet-process phosphoric acid hydrogen fluoride silicon tetrafluoride membrane method dehumidification technique

Received 2021-02-01;

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Corresponding Authors: 朱静,教授,E-mail:jzhul@gzu.edu.cn。 Email: jzhul@gzu.edu.cn

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OU Jian, LI Tianxiang, LIU Songlin, SUI Yanfeng, SHI Lianjun, ZHU Jing.Dehumidification of simulated fluorine-containing water vapor by membrane method[J] Chemcial Industry and Engineering, 2023,V40(3): 96-103

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