Determination of gas-liquid mass transfer coefficient for methanol synthesis under supercritical condition

被引：0

作者：

Li, Jinggang ^{[1
]}

Wu, Sicao ^{[1
]}

Liu, Peng ^{[1
]}

Cheng, Zhenmin ^{[1
]}

Zhou, Zhiming ^{[1
]}

Fang, Yunjin ^{[1
]}

机构：

[1] State Key Laboratory of Chemical Engineering, East China University of Science and Technology

来源：

Huagong Xuebao/CIESC Journal | 2014年 / 65卷 / 01期

关键词：

Mass transfer; Methanol; Process intensification; Supercritical fluid; Synthesis;

D O I：

10.3969/j.issn.0438-1157.2014.01.011

中图分类号：

学科分类号：

摘要：

Gas-liquid mass transfer coefficient for methanol synthesis was determined in a mechanically agitated slurry reactor with paraffin oil as the inert liquid medium and n-hexane as the supercritical medium. The ratio of gas-liquid mass transfer resistance to reaction resistance increased with increasing of catalyst concentration under the reaction condition of temperature 238°C, syngas pressure 3.7 MPa, and space velocity 2744 h-1. As gas-liquid mass transfer was the control step, gas-liquid mass transfer coefficients were obtained by extrapolation. Catalyst concentration had a much bigger effect on gas-liquid mass transfer of CO than that of CO2. Gas-liquid mass transfer coefficients of CO and CO2 in the liquid-phase reaction were 0.161 s-1 and 0.03 s-1 respectively, while they were 0.199 s-1, 0.042 s-1 under supercritical condition. Supercritical fluid is conductive to gas-liquid mass transfer in the three-phase methanol synthesis process. © All Rights Reserved.

引用

页码：87 / 92

页数：5

共 19 条

[1] Sherwin M.B., Blum D.B., Methanol synthesis in a three phases reactor, Pre. Pap-Am. ChemSocDiv Fuel Chem., 20, (1975)
[2] Liong K.K., Wells P.A., Foster N.R., Diffusion in supercritical fluids, Super. Fluids, 4, pp. 91-108, (1991)
[3] Subramaniam B., Christopher J.L., Arunajatesan V., Environmentally benign multiphase catalysis with dense phase carbon dioxide, App. Catal. B: Envir., 37, pp. 279-292, (2002)
[4] Baiker A., Supercritical fluids in heterogeneous catalysis, Chem. Rev., 99, pp. 453-474, (1999)
[5] Kohshiroh Y., Yoshio H., Kaoru F., Supercritical phase Fisher-Tropsch synthesis, Chem. Eng. Sci., 45, pp. 2743-2750, (1990)
[6] Kohshiroh Y., Yoshio H., Kaoru F., Supercritical phase Fisher-Tropsch synthesis research(II): The effective diffusion of reactants and products in the supercritical phase reaction, Ind. Eng. Chem. Res., 30, pp. 95-100, (1991)
[7] Fan L., Yoshii K., Yan S., Fujimoto K., Selective synthesis of wax from syngas by supercritical phase Fisher-Tropsch reaction on ruthenium catalysts, J. Chem. Eng. Jpn., 30, pp. 923-927, (1997)
[8] Teramoto M., Tai S., Nishii K., Et al., Effect of pressure on liquid-phase mass transfer coefficient, Chem. Engng. Journal, 8, pp. 223-226, (1974)
[9] Chang M.Y., Eiras J.G., Morsi B.I., Mass transfer characteristics of gases in n-hexane at elevated pressures and temperatures in agitated reactors, Chem. Engng. Process, 29, 1, pp. 49-60, (1991)
[10] Chang M.Y., Morsi B.I., Mass transfer characteristics of gases in n-decane at elevated pressures and temperatures in agitated reactors, Chem. Engng. Journal, 47, pp. 33-45, (1991)

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