Solubilities of Gases in 1,1,3,3-Tetramethylguanidium Lactate at Elevated Pressures

Abstract

Solubilities of O 2, N 2, H 2, and CH 4 in 1,1,3,3-tetramethylguanidium lactate (TMGL) at the temperatures ranging from (308 to 327) K and the pressures ranging from (0 to 11) MPa were measured. The solublilities were correlated using the Krichevisky−Kasarnovsky equation, from which Henry's constants and partial molar volumes of these four gases were obtained. It was found that the solubilities increase with increasing pressure and decrease with increasing temperature. The solubilities of these four gases in TMGL follow the sequence x CH 4 > x O 2 > x N 2 > x H 2 (i.e., H CH 4 < H O 2 < H N 2 < H H 2 ). Comparing the solubility data of these four gases with that of CO 2 in TMGL, it is observed that the solubilities of these four gases in TMGL are much lower than that of CO 2 . This means that TMGL may be used as a potential solvent for capturing CO 2 from mixed gases.