Abstract
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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Supported by the Jiangsu Planned Projects for Postdoctoral Research Funds (No. 0901001C), the National Natural Science Foundation of China (Grant No. 20876072) and the Natural Science Foundation of Jiangsu Province (No. KB2008023)
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Pu, L., Sun, Y. & Zhang, Z. Hydrogen bonding of single acetic acid with water molecules in dilute aqueous solutions. Sci. China Ser. B-Chem. 52, 2219–2225 (2009). https://doi.org/10.1007/s11426-009-0288-4
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DOI: https://doi.org/10.1007/s11426-009-0288-4