Solubilities of Dodecylpolyoxyethylene Polyoxypropylene Ether in Supercritical Carbon Dioxide

Abstract

The equilibrium solubilities of two dodecylpolyoxyethylene polyoxypropylene ether nonionic surfactants (A(EO)BmB(PO) n ) in supercritical carbon dioxide were measured at temperatures ranging from (308 to 328) K and pressures from (13.6 to 32.0) MPa in a stainless steel variable-volume view cell. The experimental data were correlated using a semiempirical model. The calculated results show satisfactory agreement with the experimental data.

Solubility comparison and partial molar volumes of 1,2-hexanediol before and after end-group modification by methyl oxalyl chloride and ethyl oxalyl monochloride in supercritical CO2

“…The modified compounds 2 to 3 showed better solubility than compound 1 in scCO 2 (figure 2). It is proposed that the carbonyl, and the ether groups are CO 2 -philic parts, which are helpful to enhance the interaction of solute-solvent [30]. As for the higher solubility of compound 2 than compound 3, it could be attributed to the smaller molar mass difference [31].…”

Solubilities and partial molar volumes of new CO2-philic propane derivatives in supercritical carbon dioxide

“…However, solubility data under high and low temperature in scCO 2 are less frequently reported [12][13][14][15]. Furthermore, CO 2 is a non-polar molecule with a low dielectric constant, which prevents it from dissolving hydrophilic compounds with high polarity, metal ions and high-molecular-mass compounds [16][17][18][19][20][21][22][23][24][25][26][27]. One solution to enhance the solubility is to introduce some CO 2 -philic compounds into the scCO 2 system.…”

Solubilities and partial molar volumes of N,N′-dibutyl-oxalamide, N,N′-dihexyl-oxalamide, N,N′-dioctyl-oxalamide in supercritical carbon dioxide

“…However, solubility data under high and low temperature in scCO 2 are less frequently reported [12][13][14][15]. Furthermore, CO 2 is a nonpolar molecule with a low dielectric constant, which prevents it from dissolving hydrophilic compounds with high polarity, metal ions and high-molecular-mass compounds [16][17][18][19][20][21][22][23][24][25][26][27][28]. One solution suggested to enhance the solubility is to introduce some CO 2 -philic compounds into the scCO 2 system.…”

“…In scCO 2 , the high solubility of carbonyl-group-containing compounds is attributed to the Lewis acid-Lewis base interactions between electron-donating carbonyl moieties and CO 2 . The high CO 2 solubility of acetamide-group-containing hydrocarbons is relevant to the formation of a weak complex between the carbonyl group and CO 2 [24,25].…”