Hydrogen bonding of single acetic acid with water molecules in dilute aqueous solutions

被引:0
作者
Liang Pu
YueMing Sun
ZhiBing Zhang
机构
[1] Southeast University,School of Chemistry and Chemical Engineering
[2] Nanjing University,Separation Engineering Research Center of Nanjing University, Key Laboratory in Meso
来源
Science in China Series B: Chemistry | 2009年 / 52卷
关键词
acetic acid; hydrogen bond; molecular dynamics; free energy;
D O I
暂无
中图分类号
学科分类号
摘要
In separation processes, hydrogen bonding has a very significant effect on the efficiency of isolation of acetic acid (HOAc) from HOAc/H2O mixtures. This intermolecular interaction on aggregates composed of a single HOAc molecule and varying numbers of H2O molecules has been examined by using ab initio molecular dynamics simulations (AIMD) and quantum chemical calculations (QCC). Thermodynamic data in aqueous solution were obtained through the self-consistent reaction field calculations and the polarizable continuum model. The aggregation free energy of the aggregates in gas phase as well as in aqueous system shows that the 6-membered ring is the most favorable structure in both states. The relative stability of the ring structures inferred from the thermodynamic properties of the QCC is consistent with the ring distributions of the AIMD simulation. The study shows that in dilute aqueous solution of HOAc the more favorable molecular interaction is the hydrogen bonding between HOAc and H2O molecules, resulting in the separation of acetic acid from the HOAc/H2O mixtures with more difficulty than usual.
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页码:2219 / 2225
页数:6
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