Investigation on dispersion properties of CO2and ester solvent mixtures usingin situFTIR spectroscopy

Abstract

To study the microscopic dispersion state of CO2in different ester solvents, the solubility, volume expansion coefficients andin situFourier transform infrared (FTIR) spectra of the CO2-ester system were measured. The results show that the solubility and expansion coefficient of CO2in ester solvents decreases as the hydrocarbon chain increases. As the pressure increases, the infrared absorption peaks of CO2and the functional groups characteristic of ester molecules shift, indicating that CO2molecules interact with ester molecules and that CO2would destroy the interactions between the ester molecules. The hydrocarbon chain length of the ester molecules has a significant effect on the infrared absorption peak of the CO2-ester system. As the hydrocarbon chain length increases, the CO2absorption peak shift and peak shift of the carbonyl groups in the ester gradually decrease.