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Indexed by:期刊论文

Date of Publication:2018-07-01

Journal:JOURNAL OF SURFACTANTS AND DETERGENTS

Included Journals:SCIE

Volume:21

Issue:4

Page Number:509-522

ISSN No.:1097-3958

Key Words:Nonionic surfactant; Solubility enhancement; Supercritical CO2; Molecular chain length

Abstract:The effects of selected nonionic surfactants on dissolution pressures of the octacosane and hydrocarbon mixtures in supercritical CO2 (scCO(2)) were investigated at 318-343K to study relationships between the structures of the surfactants and their ability to improve solubility. Dissolution pressures of the solutes were experimentally observed to be decreased by at most 11.10% and at least 0.44% in the presence of the surfactants. However, this solubility-improving performance was diminished with an increase in the molecular chain length of the surfactant. Linear surfactants gave better solubility-improving performances in the octacosane/scCO(2) systems, while branched compounds were better in the hydrocarbon mixture/scCO(2) systems, which are attributed to the similarity of the chain length between the surfactant and the solute. X-ray computed tomography tests provided evidence for direct material exchange between the hydrocarbon mixture and scCO(2).