渗透汽化膜分离MeOH/MTBE混合物的传质分析——单组分在膜中的扩散

用石英晶体微平衡法测定了298.15 K、305.75 K、312.95 K下MeOH（甲醇）和MTBE（甲基叔丁基醚）在CA（醋酸纤维素）膜中的吸着平衡数据和吸着动力学数据.结果表明：MeOH和MTBE在CA膜中的传质过程属于Fick扩散类型；MeOH在CA膜中的平衡吸着量和扩散系数都比MTBE大，说明CA膜对MeOH/MTBE混合物有较好的分离性能；同一吸着温度下，吸着速度和平衡吸着量均随着吸着蒸气压的升高而升高；可用Eyring的扩散“空穴”理论解释MeOH和MTBE在膜中的扩散行为.

MASS TRANSPORT ANALYSIS OF SEPARATION OF METHANOL/MTBE MIXTURES BY PERVAPORATION--DIFFUSION OF SINGLE COMPONENT IN MEMBRANE

The equilibrium solubility and sorption curves for methano l( MeOH) and methly ter-butyl ether(MTBE) in cellulose acetate (CA) membrane a t 298.15 K,305.75 K and 312.95 K were measured by quartz crystal microbal ance method. The results showed that mass transport processes of MeOH and MTBE in CA membrane belonged to Fickion diffusion .Both the equilibrium solubility a nd sorption rate of MeOH were much higher than that of MTBE, which meant that CA membrane had excellent separation performance for MeOH/MTBE mixtures. At the s ame sorption temperature, the equilibrium solubility and sorption rate increased with increasing sorption vapor pressure. The diffusion of MeOH and MTBE in CA membrane could be explained by Eyring's "hole" theory of diffusion.