Solubility of novel open-chain crown ether bridged diphosphates in supercritical carbon dioxide
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- 作者：Qilong Ren ; Di Duan ; Hai Zhang ; Baogen Su ; Zhiguo Zhang ; Zongbi Bao ; Yiwen Yang
- 关键词：Bartle and Chrastil model ; Cloud point ; Diphosphate ; Partial molar volumes ; Solubility ; Supercritical carbon dioxide
- 刊名：Journal of Chemical Thermodynamics
- 出版年：2013
- 出版时间：December, 2013
- 年：2013
- 卷：67
- 期：Complete
- 页码：40-47
- 全文大小：775 K
文摘
The solubility of newly synthesized chelating agents, i.e., tetraethylene glycol bis (2-ethylhexyl) dimethyl diphosphate (EG4EH), tetraethylene glycol bis (n-octyl) dimethyl diphosphate (EG4Oct), and tetraethylene glycol bis (2-butoxyethyl) dimethyl diphosphate (EG4BOE) in supercritical carbon dioxide (scCO2) were determined at temperatures ranging from (318.15 to 333.15) K and pressures ranging from (12 to 21) MPa. Solubility increases in the order of EG4Oct (MW = 606.33) < EG4BOE (MW = 582.26) < EG4EH (MW = 606.33), indicating that branched side chains of the ligands play an important part in increasing solubility in scCO2. Semi empirical density-based models proposed by Bartle and Chrastil were used to correlate the experimental data, and AARD values were calculated to be (1.2 to 2.9) % and (0.40 to 0.93) % for Bartle and Chrastil model, respectively. Additionally, the partial molar volumes of those compounds were estimated following the theory developed by Kumar and Johnston.