Permeation Property of Trace Water in the Chloromethanes through NaA Zeolite Membrane Simulated by Maxwell-Stefan Theory
Maxwell-Stefan理论模拟NaA沸石膜分离一氯甲烷中微量水的渗透特性

High quality NaA zeolite membrane was prepared secondary hydrothermal synthesis using hot dip-coating seeding and studied for the removal of trace water from chloromethanes by vapor permeation. The NaA zeolite membrane showed an excellent separation selectivity of water over chloromethanes as high as 74831, the water content of product decreased from 0.2582%(ω) to 0.005%(ω). The observed water permeation dependencies of pressure and temperature were simulated by Maxwell-Stefan approach. There was good agreement between the simulated and observed results. It reveals that water vapor permeation is governed by surface diffusion, and the adsorption isotherm of water is Langmuir type, the adsorption water plays an important role in the water permeation flux. Furthermore the calculated adsorption enthalpy of water was -34.15 kJ/mol.