Decarbonization reaction kinetics of MDEA and MEA

doi:10.11949/j.issn.0438-1157.20151480

Abstract

Abstract:

Based on the small reaction kettle experiment device, the data approximation could be adopt to establish the kinetics model by two-film theory. Then the reaction kinetics of amine solutions of MEA (monoethanolamine), MDEA (methyldiethanolamine) and both mixtures were analyzed by the model. The reaction kinetics models of MEA and MDEA, which was established by pseudo-first-order reaction, could forecast gas-liquid mass transfer performance of them well after experimental verification. The result showed that the interaction coefficient and mass transfer rate of MEA was higher than that of MDEA. The mass transfer rates decreased with the process of reaction. In addition, the apparent propagation rate constant and enhancement factor of mixed amine increased with the increasing temperature and the ratio of MEA. At last, it forecasted that the mixed amine of MDEA+MEA (2 mol·L^-1+1 mol·L^-1) had the better decarbonization performance, which had higher mass transfer rate with its enhancement factor of 0.5.

Key words: natural gas, decarbonization, MDEA, MEA, reaction kinetic, mass transfer

摘要：

通过双模理论及反应釜吸收实验的方法,建立了胺液脱碳拟一级传质反应模型,并对其进行了实验验证。通过模型中的增强因子、二级反应速率常数及传质速率分析了伯胺MEA(乙醇胺)及叔胺MDEA(甲基二乙醇胺)的动力学特性,以此为基础进一步分析了MDEA+MEA混合胺液的交互作用、动力学特性,并得到了较优的胺液配比。研究结果表明:伯胺MEA的增强因子及传质速率数值大于叔胺MDEA,随着气液传质过程进行,传质速率逐渐减小;对于混合胺液,表观反应速率常数以及增强因子随着MEA浓度的增加以及温度的升高而逐渐增大;当总胺浓度为3mol·L^-1时,MDEA+MEA(2mol·L^-1+1mol·L^-1)的混合胺液增强因子数值为0.5,传质速率较大,为最优混合胺液配比。

关键词: 天然气, 脱碳, MDEA, MEA, 动力学, 传质

CLC Number:

TE644

TANG Jianfeng, ZHANG Guojun, SHI Zelin, HUANG Bin, WANG Yue, ZHAO Mingyu. Decarbonization reaction kinetics of MDEA and MEA[J]. CIESC Journal, 2016, 67(6): 2355-2362.

唐建峰, 张国君, 史泽林, 黄彬, 王曰, 赵铭钰. MDEA与MEA脱碳反应动力学[J]. 化工学报, 2016, 67(6): 2355-2362.

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