膜科学与技术

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Experimental study and process simulation of CO2 removal by membrane
separation for online reuse of xenon in medical anesthesia

Authors： LI Lixin, MA Yingchao, WANG Changchun, REN Yanbo, REN Xiaoguang, LIU Jianhui, LIU Dandan, WANG Lina, YU Haijun, KANG Guodong, CAO Yiming, JIE Xingming

Units： 1. Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian 116023, China; 2. The First Affiliated Hospital of Dalian Medical University, Dalian 116011, China; 3. Yulin Zhongke Clean Energy Innovation Research Institute, Yulin 719111, China

KeyWords： xenon anesthesia gas; hollow fiber membrane; xenon recovery; CO2 removal of mixed gas

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2025,45(6):98-107

Abstract：

Medical xenon anesthesia gas will be mixed with a certain concentration of CO2 after human metabolic cycle. In order to meet the requirements of recycling, the CO2 concentration should be reduced to less than 0.50%. Commercial polyetherimide (PEI) and polysulfone (PSf) were used as raw materials to prepare hollow fiber membranes. The permeation rates of O2, N2, Xe and CO2 in the two membranes were measured. Using the volume fraction of 5.0% CO2/25.0% O2/5.0% N2/65.0% Xe (surrogated by N2) as the feed gas, the effects of vent ratio (ratio of retentate gas and permeate gas flow), inlet pressure and other parameters on the CO2 removal performance were systematically studied through the self-made PEI and PSf hollow fiber membrane modules at room temperature. Based on the experimental data, a two-stage membrane separation simulation system was designed. The experimental results showed that the CO2/N2 and CO2/Xe separation coefficients of PEI membrane were higher than that of PSf membrane with lower gas permeation rates. Increasing the vent ratio would increase the gas treatment capacity of membrane, but lead to the increase of CO2 concentration in the retentate gas. The increase of feed gas pressure obviously promoted the CO2 removal process driven by pressure difference, and produced more gas that met the reuse standard. The pressure of the actual mixed gas CO2 removal process was relatively low, and the performance of the membrane module was more obviously affected by its gas permeation rate on the premise that the two membrane separation coefficients were both high. The xenon recovery rate of the two-stage membrane separation simulation system established based on the experimental data was 98.90%, and the CO2 concentration in the regenerated xenon anesthesia mixture was not higher than 0.50%, which meets the requirements of recycling and greatly reduces the cost of anesthesia xenon.

Funds：

大医一院-大连化物所医工联合创新基金（DMU-1&DICP UN202305）；国家自然科学基金面上项目（22178333）；榆林中科洁净能源创新研究院能源革命科技专项联合基金项目（E411080316）；大连市科技创新基金重点学科重大课题项目（2022JJ11CG006）

AuthorIntro：

李立鑫（2000-），男，辽宁大连人，硕士生，主要研究方向为膜分离技术.

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