Permeation and separation characteristics of a mixture of benzene/cyclohexane through cellulose alkyl ester membranes during pervaporation
Permeation and separation characteristics of a mixture of benzene/cyclohexane through cellulose alkyl ester membranes during pervaporation
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DOI：
10.1002/macp.200400488
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发表时间：
2005-03
影响因子：
2.5
通讯作者：
T. Uragami;K. Tsukamoto;T. Miyata
中科院分区：
文献类型：
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作者：
T. Uragami;K. Tsukamoto;T. Miyata
合成了乙基、丁酰基、戊基和庚基纤维素等烷基酯基中碳原子数不同的纤维素烷基酯，用于分离低浓度苯的苯/环己烷（Bz/Chx = 5/95 w/w）混合物。所有的纤维素烷基酯膜显示出高的苯/环己烷。Bz/Chx混合物的渗透蒸发选择性。随着酯基碳数的增加，渗透速率增加，但苯/环己烷选择性降低。渗透速率的增加可以归因于由于进料混合物引起的膜溶胀的增加，并且苯/环己烷选择性的降低依赖于溶解度选择性和扩散选择性的降低。这些渗透蒸发特性的纤维素烷基酯膜的化学和物理结构，如溶胀度，接触角，和纤维素酯膜的密度，和溶液的组成吸收到他们的膜的观点进行了讨论。
Cellulose alkyl esters such as ethyl, butyryl, pentyl, and heptyl cellulose with different numbers of carbon in the alkyl ester group were synthesized for the separation of a mixture of benzene/cyclohexane (Bz/Chx = 5/95 w/w) with a low concentration of benzene. All of cellulose alkyl ester membranes showed high benzent/cyclohexane. selectivity for a Bz/Chx mixture in pervaporation. With increasing carbon number in the ester groups, the permeation rate increased but the benzene/cyclohexane selectivity decreased. The increase in the permeation rate could be attributed to an increase in the swelling of the membrane due to the feed mixture, and the decrease in the benzene/cyclohexane selectivity was dependent on both the decrease in the solubility selectivity and the diffusion selectivity. These pervaporation characteristics are discussed from the viewpoints of chemical and physical structure of the cellulose alkyl ester membranes such as the degree of swelling, the contact angle, and the density of the cellulose ester membranes, and the solution composition absorbed into their membranes.