Abstract
The end groups of bis(2-hydroxyethyl) ether (compound 1) and tetraethylene glycol (compound 2) were modified by ethyl oxalyl chloride to produce two new compounds: oxalic acid 2-(2-ethoxy-oxalyloxy-ethoxy)-ethyl ester ethyl ester (compound 3) and oxalic acid 2-{2-[2-(2-ethoxyoxalyloxyethoxy)-ethoxy]-ethoxy}-ethyl ester ethyl ester (compound 4). Then, the solubility of compounds 1 to 4 were investigated and compared in supercritical carbon dioxide at a temperature range of (313 to 333) K and in the pressure range of (9.1 to 19.6) MPa. The effect of the end group and molecular weight for the solubility of the compounds were discussed. In addition, the tested solubility data were then calculated and correlated with the semiempirical model at different pressures and temperatures, which showed satisfactory agreement with each other, and the average absolute relative deviation was in the range of (0.07 to 13.82) %.
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