超临界条件下甲醇合成的气液传质系数测定

doi:10.3969/j.issn.0438-1157.2014.01.011

化工学报 ›› 2014, Vol. 65 ›› Issue (1): 87-92.DOI: 10.3969/j.issn.0438-1157.2014.01.011

超临界条件下甲醇合成的气液传质系数测定

李京刚, 吴思操, 刘鹏, 程振民, 周志明, 方云进

华东理工大学化学工程联合国家重点实验室, 上海 200237

收稿日期:2013-07-01 修回日期:2013-09-27 出版日期:2014-01-05 发布日期:2014-01-05
通讯作者: 程振民
作者简介:李京刚（1988-），男，硕士研究生。
基金资助:
国家自然科学基金项目（20876043，21076072）。

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

LI Jinggang, WU Sicao, LIU Peng, CHENG Zhenmin, ZHOU Zhiming, FANG Yunjin

State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China

Received:2013-07-01 Revised:2013-09-27 Online:2014-01-05 Published:2014-01-05
Supported by:
supported by the National Natural Science Foundation of China (20876043,21076072).

摘要/Abstract

摘要： 以液体石蜡为惰性液相载体，正己烷为超临界介质，合成气制甲醇为研究体系，测定了超临界条件下三相浆态床中甲醇合成的气液传质系数。在反应温度238℃、合成气分压3.7 MPa、气体空速2744 h^-1条件下，通过不断增加催化剂浓度提高气液传质阻力和反应阻力的相对大小，采用外推法获得完全处于气液传质控制下的气液传质系数。计算结果表明：催化剂浓度对CO的气液传质系数的影响较大，而对CO₂的气液传质系数的影响较小；液相条件下CO、CO₂的气液传质系数分别是0.161、0.03 s^-1，而超临界三相甲醇合成中CO、CO₂的气液传质系数分别是0.199、0.042 s^-1，说明三相浆态床甲醇合成中引入超临界流体利于气液传质，验证了超临界介质中三相甲醇合成的优越性。

关键词: 甲醇, 合成, 超临界流体, 传质, 过程强化

Abstract: 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℃, 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.

Key words: methanol, synthesis, supercritical fluid, mass transfer, process intensification

中图分类号:

TQ021.4

李京刚, 吴思操, 刘鹏, 程振民, 周志明, 方云进. 超临界条件下甲醇合成的气液传质系数测定[J]. 化工学报, 2014, 65(1): 87-92.

LI Jinggang, WU Sicao, LIU Peng, CHENG Zhenmin, ZHOU Zhiming, FANG Yunjin. Determination of gas-liquid mass transfer coefficient for methanol synthesis under supercritical condition[J]. CIESC Journal, 2014, 65(1): 87-92.

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超临界条件下甲醇合成的气液传质系数测定

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

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