甲烷氧化偶联(Oxidative Coupling of Methane,OCM)法可实现由甲烷一步转化为乙烯。反应产物混合气要经过以甲苯为吸收剂的吸收分离工艺流程处理才能最终得到乙烯,而吸收塔是其中关键的设备。对甲苯吸收塔进行准确的仿真计算,对于指导...甲烷氧化偶联(Oxidative Coupling of Methane,OCM)法可实现由甲烷一步转化为乙烯。反应产物混合气要经过以甲苯为吸收剂的吸收分离工艺流程处理才能最终得到乙烯,而吸收塔是其中关键的设备。对甲苯吸收塔进行准确的仿真计算,对于指导生产过程的设计和操作有着重要的意义。通过建立吸收塔的数学模型,并运用化工动态流程模拟优化系统(Dy-namic Simulation & Optimization,DSO)平台对吸收过程进行了模拟。应用结果表明,整个仿真过程能够很好地反映出装置正常工况时的设备运行情况。仿真结果不仅可以作为操作人员分析生产过程的依据,而且还为改进设计和操作条件,以达到提高吸收塔处理能力和降低能量消耗,提供了有价值的参考。展开更多
Membrane-based separation processes are new technology combined membrane separation with conventional separation. Hydrophobic porous membranes are often used in these processes. The structure of hydrophobic porous mem...Membrane-based separation processes are new technology combined membrane separation with conventional separation. Hydrophobic porous membranes are often used in these processes. The structure of hydrophobic porous membrane has significant effect on mass transfer process. The permeabilities of five kinds of gas, He, N2, O2, CO2 and water vapor, across six polytetrafluoroethylene(PTFE) flat membranes were tested experimentally. Results indicated that the greater the membrane mean pore size and the wider the pore size distribution are, the higher the gas permeability. A gas permeation model, including the effects of membrane structure parameter and gas properties, was established. A comprehensive characteristic parameter (including porosity, thickness and tortuosity) was found more effective to express the influence of membrane structure in gas permeation process. The predicted permeation coefficients were in good agreement with experimental data.展开更多
基金Supported by the 863 Hi-Tech. Research and Development Program of China (No. 2002AA649280, No. 2002AA304030),National Natural Science Foundation of China (No. 20206002), Beijing NOVA program (H013610250112), University Doctor Science Foundation of China
文摘Membrane-based separation processes are new technology combined membrane separation with conventional separation. Hydrophobic porous membranes are often used in these processes. The structure of hydrophobic porous membrane has significant effect on mass transfer process. The permeabilities of five kinds of gas, He, N2, O2, CO2 and water vapor, across six polytetrafluoroethylene(PTFE) flat membranes were tested experimentally. Results indicated that the greater the membrane mean pore size and the wider the pore size distribution are, the higher the gas permeability. A gas permeation model, including the effects of membrane structure parameter and gas properties, was established. A comprehensive characteristic parameter (including porosity, thickness and tortuosity) was found more effective to express the influence of membrane structure in gas permeation process. The predicted permeation coefficients were in good agreement with experimental data.
