Deoxygenation of a CO2 Absorbent Based on Monoethanolamine in Gas–Liquid Membrane Contactors: Dynamic Process Modeling

IF 2 Q4 CHEMISTRY, PHYSICAL Membranes and Membrane Technologies Pub Date : 2024-12-12 DOI:10.1134/S2517751624600493

D. O. Kalmykov, S. A. Shirokih, D. N. Matveev, I. V. Petrova, S. D. Bazhenov

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Abstract

The study focuses on the removal of dissolved oxygen from a model monoethanolamine (MEA)-based absorbent to prevent oxidative degradation during the absorption process of flue gas CO₂ removal. A mathematical model was developed to evaluate the deoxygenation parameters in a gas-liquid membrane contactor using composite hollow-fiber membranes with a thin non-porous layer made of a blend of polytrimethylsilylpropyne and polyvinyltrimethylsilane. The modeling results were shown to be in good agreement with experimental data on O₂ removal efficiency. The model was applied to assess the scaling of the membrane system for dissolved O₂ removal to handle an absorbent flow rate of 120 m³/h in a hypothetical CO₂ capture plant using absorption technology. The influence of system parameters (absorbent linear flow rate, membrane contactor length, number of membranes in the contactor, initial O₂ concentration in the absorbent) on O₂ removal efficiency was determined. It was shown that to achieve 90% removal of dissolved oxygen, at least 12 membrane modules with a length of 1 meter and a total membrane area of 1800 m² are required. Various scenarios of dynamically changing external system parameters (oxygen concentration in the feed, absorbent flow rate) were simulated for the designed membrane system to predict the system’s response.

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基于单乙醇胺的CO2吸附剂在气液膜接触器中的脱氧：动态过程建模

研究了一种基于模型单乙醇胺（MEA）的吸附剂对溶解氧的去除，以防止烟气CO2去除吸收过程中的氧化降解。建立了以聚三甲基硅丙炔和聚乙烯三甲基硅烷为材料的无孔复合中空纤维膜为填料的气液膜接触器中除氧参数的数学模型。模拟结果与实验数据吻合较好。该模型用于评估膜系统去除溶解O2的规模，以处理使用吸收技术的二氧化碳捕集厂中120 m3/h的吸收剂流速。考察了系统参数（吸附剂线性流量、膜接触器长度、接触器膜数、吸附剂初始O2浓度）对O2去除率的影响。结果表明，要达到90%的溶解氧去除率，至少需要12个长度为1米的膜模块，总膜面积为1800平方米。对设计的膜系统进行了各种动态变化的外部系统参数（进料中氧浓度、吸附剂流速）的模拟，以预测系统的响应。

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来源期刊

Membranes and Membrane Technologies Multiple-

CiteScore

3.10

自引率

31.20%

发文量

期刊介绍： The journal Membranes and Membrane Technologies publishes original research articles and reviews devoted to scientific research and technological advancements in the field of membranes and membrane technologies, including the following main topics:novel membrane materials and creation of highly efficient polymeric and inorganic membranes;hybrid membranes, nanocomposites, and nanostructured membranes;aqueous and nonaqueous filtration processes (micro-, ultra-, and nanofiltration; reverse osmosis);gas separation;electromembrane processes and fuel cells;membrane pervaporation and membrane distillation;membrane catalysis and membrane reactors;water desalination and wastewater treatment;hybrid membrane processes;membrane sensors;membrane extraction and membrane emulsification;mathematical simulation of porous structures and membrane separation processes;membrane characterization;membrane technologies in industry (energy, mineral extraction, pharmaceutics and medicine, chemistry and petroleum chemistry, food industry, and others);membranes and protection of environment (“green chemistry”).The journal has been published in Russian already for several years, English translations of the content used to be integrated in the journal Petroleum Chemistry. This journal is a split off with additional topics.