文献类型：期刊文献

英文题名：Gas-liquid equilibrium in a CO₂-MDEA-H₂O system and the effect of piperazine on it

作者：Xu, GW; Zhang, CF; Qin, SJ; Gao, WH; Liu, HB

机构：[1]E China Univ Sci & Technol, Res Inst Chem Technol, Shanghai 200237, Peoples R China

年份：1998

卷号：37

期号：4

起止页码：1473

外文期刊名：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000073101700036)】；

语种：英文

摘要：Solubility data of CO2 and vapor pressure of water in 3.04-4.28 kmol/m(3) aqueous N-methyldiethanolamine (MDEA) solutions were obtained at temperatures ranging from 40 to 100 degrees C and CO2 partial pressures ranging from 0.876 to 1013 kPa. A thermodynamic model was proposed and used for predicting CO2 solubility and water vapor pressure. An enthalpy change of absorption of CO2 in 4.28 kmol/m(3) MDEA solution was estimated. The effect of piperazine (PZ) concentration on CO2 loading in MDEA solutions was determined at piperazine concentration ranging from 0 to 0.515 kmol/m(3). The results show that piperazine is beneficial to the CO2 loading. The equilibrium partial pressure of piperazine in the PZ-MDEA-H2O system was measured in an Ellis Cell. Results show that the PZ-MDEA-H2O system is a typical negative deviation system, with the strength of deviation decreasing with MDEA solutions.