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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Fourier Transform Infrared Study on Hydrogen Bonding Species of Carboxylic Acids in Supercritical Carbon Dioxide with Ethanol
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Fourier Transform Infrared Study on Hydrogen Bonding Species of Carboxylic Acids in Supercritical Carbon Dioxide with Ethanol

机译：乙醇中超临界二氧化碳中羧酸的氢键物种的傅里叶变换红外研究

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摘要

Fourier transform infrared (FTIR) spectroscopy has been used to determine the equilibrium constants of the dimerization for carboxylic acid (acetic acid or palmitic acid) and the amount of hydrogen bonding species between carboxylic acid and ethanol in supercritical CO_2. Experiments were carried out at 308.2-313.2 K and 10.0-20.0 MPa. The noticeable band was the C=O stretching band for carboxylic acid. In the binary system (supercritical CO_2 + carboxylic acid), the equilibrium constants of the dimerization between the carboxylic acid monomer and dimer decrease with increasing pressure and temperature. The equilibrium constants of palmitic acid are larger than those of acetic acid. In a ternary system (supercritical CO_2 + carboxylic acid + ethanol), the amount of hydrogen bonding species between carboxylic acid and ethanol in supercritical CO_2 increases with the increasing mole fraction of added ethanol. Furhermore, the authors confirm that the solubility enhancement by ethanol used as an entrainer in supercritical CO_2 relates to the amount of hydrogen bonding species between carboxylic acid and ethanol.
机译：傅里叶变换红外（FTIR）光谱已用于确定羧酸（乙酸或棕榈酸）的二聚化的平衡常数以及超临界CO_2中羧酸和乙醇之间氢键键合物种的数量。实验在308.2-313.2 K和10.0-20.0 MPa下进行。值得注意的带是羧酸的C ＝ O拉伸带。在二元体系（超临界CO_2 +羧酸）中，羧酸单体和二聚体之间二聚化的平衡常数随压力和温度的升高而降低。棕榈酸的平衡常数大于乙酸的平衡常数。在三元体系（超临界CO_2 +羧酸+乙醇）中，超临界CO_2中羧酸和乙醇之间的氢键键合物种的数量随所添加乙醇的摩尔分数的增加而增加。此外，作者证实，乙醇作为夹带剂在超临界CO_2中的溶解度提高与羧酸和乙醇之间的氢键键合物种的数量有关。

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