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分别研究了甲醇(MeOH)和甲基叔丁基醚(MTBE)纯组分在二醋酸纤维素(CA)和三醋酸纤维素(CTA)膜内的吸着性能、扩散系数及渗透通量。结果表明,活度在0.2～1.0范围内,MeOH在CA和CTA膜内的平衡吸着质量分数分别为0.018～0.172和0.032～0.175,远大于MTBE,而组分在2种膜中的溶解度无明显差别,2种组分在CTA膜中的扩散系数和渗透通量均大于CA膜。考察了进料温度在25℃、32℃和40℃下,料液中MeOH质量分数为5%～35%时,MeOH/MTBE混合物在CA膜中的渗透通量和分离系数,结果表明,随着进料温度和料液中MeOH浓度的升高,通量增加,分离系数减小。
The sorption properties, diffusion coefficients and permeation fluxes of pure components of methanol (MTT) and methyl tert-butyl ether (MTBE) in cellulose diacetate (CA) and cellulose triacetate (CTA) The results showed that the equilibrium sorption mass fractions of MeOH in CA and CTA membranes ranged from 0.018 to 0.172 and from 0.032 to 0.175, respectively, which were much higher than that of MTBE with activity ranging from 0.2 to 1.0. However, the solubility of components in the two membranes was not significant Difference, diffusion coefficient and permeation flux of the two components in CTA membrane are larger than CA membrane. The permeation fluxes and separation factors of the MeOH / MTBE mixture in CA membrane were investigated at 25 ℃, 32 ℃ and 40 ℃ with the mass fraction of MeOH in the feed solution between 5% and 35%. The results show that with With increasing feed temperature and MeOH concentration in the feedstock, the flux increased and the separation factor decreased.