摘要
采用N-甲基二乙醇胺(MDEA)吸收炼化过程中干气及液态烃中过量的H2S和CO2,以达到生产要求。文中利用PRO/II软件对MDEA溶液吸收H2S和CO2的过程,采用合适的热力学模型(Electrolyte-NRTL),建立吸收塔模型进行模拟。研究了进料气液质量比、进料温度、操作压力、塔板高度、吸收液浓度等条件的改变对吸收效果的影响,并对操作条件进行评估。MDEA溶液对CO2的吸收效果不是很理想,由于伯、仲胺可直接与CO2反应,故向溶液中添加DEA,采用PRO/II的Kent-Eisenberg模型对MDEA/DEA混合胺的吸收状况进行模拟,其吸收效果较理想。文中对现有装置提出了一些技术改造建议。
The excessive H2S and CO2 in dry-gas and liquid hydrocarbon during the refining process should be removed with N-methyldiethanolamine（MDEA） in order to meet the production standard.An appropriate model was established by PRO/II to simulate the absorption of H2S and CO2 with MDEA aqueous solution,and the proper electrolyte-nonrandom-two-liquid（E-NRTL） model was used to characterize the thermodynamic behavior of the MDEA-CO2-H2S-water system.The operating conditions such as influences of mass ratio of gas-liquid feed,feeding temperature,operating pressure,packing layer height and other factors on the absorption performance were researched.The absorption effect of MDEA solution on CO2 is not perfect.As the primary amine and secondary amine can directly react with CO2,diethanolameine（DEA） was added into the aqueous solution to enhance the absorption of CO2.Kent-Eisenberg model of PRO/II was applied in this MDEA/DEA system to simulate absorption.In addition,some suggestions on the technical modification of existing plants were proposed.
出处
《化学工程》
CAS
CSCD
北大核心
2010年第6期5-9,共5页
Chemical Engineering(China)
