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Vol. 31 No. 12 (2019): Vol 31 Issue 12

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Kinetics of Hydrogenation of Acetic Acid to Ethanol

https://doi.org/10.14233/ajchem.2019.22277
Qiang Chen
National Institute of Clean-and-Low-Carbon Energy, Beijing 102211, P.R. China
https://orcid.org/0000-0002-4441-872X
Xuebing Zhang
National Institute of Clean-and-Low-Carbon Energy, Beijing 102211, P.R. China
Shuxun Tian
National Institute of Clean-and-Low-Carbon Energy, Beijing 102211, P.R. China
Junying Long
National Institute of Clean-and-Low-Carbon Energy, Beijing 102211, P.R. China
Xiangkun Meng
National Institute of Clean-and-Low-Carbon Energy, Beijing 102211, P.R. China
Qi Sun
National Institute of Clean-and-Low-Carbon Energy, Beijing 102211, P.R. China
https://orcid.org/0000-0003-0673-5932
Yonglong Li
National Institute of Clean-and-Low-Carbon Energy, Beijing 102211, P.R. China

Corresponding Author(s) : Qiang Chen

qiang.chen.cx@chnenergy.com.cn

Asian Journal of Chemistry, Vol. 31 No. 12 (2019): Vol 31 Issue 12

Abstract

The intrinsic kinetic behaviour of catalytic hydrogenation of acetic acid in vapour phase was studied over a multi-metallic catalyst. The rate expression was derived from the sequence of elementary reaction steps based on a Langmuir-Hinshelwood-model involving two types of active sites. Experiments were carried out in a fixed bed reactor, which is similar to an isothermal integral reactor designed to excluding the negative effects of internal and external diffusion. The reaction conditions investigated were as follow:reaction temperature 275-325 ºC, reaction pressure1.5-3.0 MPa, liquid hourly space velocity (sv) 0.3-1.2 h-1, molar ratio of hydrogen to acetic acid (H/AC) 8:20. The results show that conversion of acetic acid increases with increasing the reaction temperature and pressure, but decreases with increasing the space velocity and H/AC. Furthermore, reducing the reaction pressure and increasing reaction temperature, space velocity and H/AC can improve the reaction selectivity of acetic acid to ethanol. The established kinetic model results agreed with experimental results. The relative difference between the calculated value and the experimental value is less than 6 %. The values of model parameters are consistent with the three thermodynamic constraints. The study provided evidence that the intrinsic kinetic model is suitable both mathematically and thermodynamically, and it could be useful in guiding reactor design and optimization of operating conditions.

Keywords

Kinetics Hydrogenation Esterification Integral reactor Conversion Selectivity Model
Chen, Q., Zhang, X., Tian, S., Long, J., Meng, X., Sun, Q., & Li, Y. (2019). Kinetics of Hydrogenation of Acetic Acid to Ethanol. Asian Journal of Chemistry, 31(12), 2915–2923. https://doi.org/10.14233/ajchem.2019.22277
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