Abstract
In recent years, gas–liquid membrane contactors have attracted increasing attention. A membrane contactor is a device that realizes gas–liquid or liquid–liquid mass transfer without being dispersed in another phase. The membrane gas absorption method combines the advantages of chemical absorption and membrane separation, in addition to exhibiting high selectivity, modularity, and compactness. This paper introduces the operating principle and wetting mechanism of hollow membrane contactors, shows the latest research progress of membrane contactors in gas separation, especially for the removal of carbon dioxide from gas mixtures by membrane contactors, and summarizes the main aspects of membrane materials, absorbents, and membrane contactor structures. Furthermore, recommendations are provided for the existing deficiencies or unsolved problems (such as membrane wetting), and the status and progress of membrane contactors are discussed.
Highlights
Owing to the rapid economic development since the 20th century, the climate and environment have continued to deteriorate
Since most of the absorbents used for separation and other gases are organic solvents, the surface tension of organic solvents is often low, which is prone to problems such as membrane wetting and increased mass transfer resistance
Zhao et al elucidated the removal mechanisms governing pharmaceutically active compounds (PhACs) using four types of commercially available ceramic nanofiltration (NF) membranes and suggested that electrostatic interactions were more dominant than hydrophobic interactions due to higher hydrophilicity and lower densities of COOH and OH groups on the ceramic surface compared to the polymeric counterparts, as shown in Figure 4b [56]
Summary
Owing to the rapid economic development since the 20th century, the climate and environment have continued to deteriorate Natural phenomena such as the greenhouse effect and acid rain are closely related to industrial production and energy use [1,2,3,4,5]. For reconciling these diverse views, more in-depth theoretical research and visual experiments aimed at understanding these mechanisms are needed. The main methods are membrane material modification, absorbent absorption has been developed for gas separation in recentThis years. This study points out the relevant contradictions and contrarian views Even a small extent of membrane wetting has serious adverse effects on the gas separation efficiency.
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