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首页> 外文期刊>Macromolecular chemistry and physics >Permeation and separation characteristics of a mixture of benzene/cyclohexane through cellulose alkyl ester membranes during pervaporation
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Permeation and separation characteristics of a mixture of benzene/cyclohexane through cellulose alkyl ester membranes during pervaporation

机译：渗透过程中苯/环己烷混合物通过纤维素烷基酯膜的渗透和分离特性

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摘要

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 benzene/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.
机译：合成了在烷基酯基团中具有不同碳数的纤维素烷基酯，例如乙基，丁酰基，戊基和庚基纤维素，用于分离苯/环己烷（Bz / Chx = 5/95 w / w）与苯浓度低。所有纤维素烷基酯膜在全蒸发中对Bz / Chx混合物均表现出较高的苯/环己烷选择性。随着酯基中碳原子数的增加，渗透速率增加，但苯/环己烷的选择性降低。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取决于溶解度选择性和扩散选择性的降低。从纤维素烷基酯膜的化学和物理结构，例如溶胀度，接触角和纤维素酯膜的密度，以及吸收到它们的膜中的溶液组成的观点出发，讨论这些全蒸发特性。

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