Retention Indices and Sorption Enthalpies of Pentaerythritol and С2–С8 Acid Esters on Nonpolar Stationary Phases
作者:V. V. Emel’yanov、E. L. Krasnykh、S. V. Portnova
DOI:10.1134/s003602442010009x
日期:2020.10
The retention and sorption enthalpy characteristics of 38 pentaerythritol esters of C-2-C(8)carboxylic acids of different structures were determined by gas-liquid chromatography on a nonpolar phase in the temperature range 433.2-563.2 K. The molecular structure was shown to affect the temperature dependence of the retention indices of the esters. The average change in the sorption enthalpy of pentaerythritol tetraesters per CH(2)group is lower in magnitude than the similar contribution for normal alkanes. The excess mixing enthalpy at 298.2 K was evaluated for four fully substituted pentaerythritol esters.
A solvent extraction composition that is particularly useful for the extraction of metals from a solution containing the metals. The solvent extraction composition includes an orthohydroxyaryloxime extractant, at least one water immiscible organic solvent, and an effective amount of a substantially water insoluble equilibrium modifier. The equilibrium modifier includes at least one of an aliphatic, aromatic or araliphatic compound comprising three or more ester functional groups. A method for the solvent extraction of a metal such as copper from an aqueous solution using the solvent extraction composition is also provided.
[EN] COMPOUND FOR OPTICAL MATERIAL, CURABLE COMPOSITION, CURED BODY, AND OPTICAL ARTICLE<br/>[FR] COMPOSÉ POUR MATÉRIAU OPTIQUE, COMPOSITION DURCISSABLE, CORPS DURCI ET ARTICLE OPTIQUE<br/>[JA] 光学材料用化合物、硬化性組成物、硬化体、及び光学物品