Abstract

Ionic liquids (ILs) have gained attention as a promising absorbent for natural gas drying due to their attractive properties, such as negligible volatility, low toxicity, excellent thermal stability, and designability. The natural gas dehydration technology with ILs is discussed systematically from molecular mechanism level to industrial-scale process simulation. Firstly, the principles of being a good dehydration absorbent are presented, and the computer-aided IL screening methods are introduced. Then, the experimental device and method for measuring the solubility of methane in ILs were described. Furthermore, the method for measuring the saturated vapor pressure for complexes of water–IL is presented. Besides, the procedure of the natural gas dehydration experiment carried out in the laboratory is introduced in detail. The natural gas dehydration mechanism with ILs is explored at a microscopic molecular level. The process simulation of gas dehydration with IL is briefly described. Finally, two cases of natural gas dehydration process with ILs are introduced in detail: using pure IL and organic solvent–IL mixture as an absorbent.

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