【摘要】 根据双膜理论建立了全微分传质动力学模型,以苯-N-甲酰吗啉(NFM)水溶液体系为代表,研究了聚丙烯PP疏水性微孔膜接触器的传质过程,并通过理论模拟及实验考察了气液相流速、气液相进口浓度、液相N-甲酰吗啉浓度、气液流动方式及膜接触器形态对苯传质通量及去除效率的影响.结果表明,模拟值与实验值吻合良好,误差控制在20%以内.当气相流量或气相进口浓度较低时,气相传质为控制步骤,而随着气相流量和气相进口浓度升高,液相流量对传质过程的影响显著增加.传质通量随气液相流量和气相进口浓度的增大而增大.液相进口浓度及膜丝内径的增大显著降低传质通量.另外,较薄的膜丝壁厚有利于传质的进行,气液逆向流方式较同向流方式可获得更高的传质通量.更多还原

【Abstract】 A differential equations mathematical model was developed for the transport of benzene through hollow fiber membrane in the presence of an aqueous N-formylmorpholine(NFM) solution. The model was based on "non-wetted mode" and the laminar parabolic velocity profile was used for the gas flow in the tube side,whereas,the liquid flow in the shell side was characterized by Happel’s free surface model. The effects of various factors such as gas and liquid flow rates,gas and liquid feeding concentration,flow pattern,membrane inner radius and membrane number on mass transfer were simulated. Moreover,the simulation results were validated with the experimental data and it was found the simulation result agreed with the experimental data well.更多还原