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Vol. 26 No. 2 (2014): Vol 26 Issue 2

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Study on Gas-Phase Mechanism of Chloroacetic Acid Synthesis by Catalysis and Chlorination of Acetic Acid

https://doi.org/10.14233/ajchem.2014.15484
Jian-Wei Xue*
Research Institute of Special Chemicals, Taiyuan University of Technology, Taiyuan 030024, Shanxi Province, P.R. China *Corresponding author: Fax: +86 351 6111178; Tel: +86 351 60105503; E-mail: xuejianwei@yeah.net
Jian-Peng Zhang
Research Institute of Special Chemicals, Taiyuan University of Technology, Taiyuan 030024, Shanxi Province, P.R. China *Corresponding author: Fax: +86 351 6111178; Tel: +86 351 60105503; E-mail: xuejianwei@yeah.net
Bo Wu
Research Institute of Special Chemicals, Taiyuan University of Technology, Taiyuan 030024, Shanxi Province, P.R. China *Corresponding author: Fax: +86 351 6111178; Tel: +86 351 60105503; E-mail: xuejianwei@yeah.net
Fu-Xiang Li
Research Institute of Special Chemicals, Taiyuan University of Technology, Taiyuan 030024, Shanxi Province, P.R. China *Corresponding author: Fax: +86 351 6111178; Tel: +86 351 60105503; E-mail: xuejianwei@yeah.net
Zhi-Ping Lv
Research Institute of Special Chemicals, Taiyuan University of Technology, Taiyuan 030024, Shanxi Province, P.R. China *Corresponding author: Fax: +86 351 6111178; Tel: +86 351 60105503; E-mail: xuejianwei@yeah.net

Asian Journal of Chemistry, Vol. 26 No. 2 (2014): Vol 26 Issue 2

Abstract

The process of acetic acid catalysis and chlorination for synthesizing chloroacetic acid can exist in not only gas phase but also liquid phase. In this paper, the gas-phase reaction mechanism of the synthesis of chloroacetic acid was studied. Due to the high concentration of acetic acid and the better reaction mass transfer in the liquid-phase reaction, the generation amount of the dichloroacetic acid was higher than that in the gas-phase reaction. Under the solution distillation, the concentration of acetyl chloride, whose boiling point is very low, was very high in the gas phase, sometimes even up to 99 %, which would cause the acetyl chloride to escape rapidly with the hydrogen chloride exhaust, so that the reaction slowed down. Therefore, series reactions occured easily in the gas-phase reaction causing the amount of the dichloroacetic acid to increase.

Keywords

Gas phase Catalysis Chlorination Chloroacetic acid Acetic acid.
Xue*, J.-W., Zhang, J.-P., Wu, B., Li, F.-X., & Lv, Z.-P. (2014). Study on Gas-Phase Mechanism of Chloroacetic Acid Synthesis by Catalysis and Chlorination of Acetic Acid. Asian Journal of Chemistry, 26(2), 475–480. https://doi.org/10.14233/ajchem.2014.15484
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