Dehydration of an ethanol/water azeotrope by novel organic-inorganic hybrid membranes based on quaternized chitosan and tetraethoxysilane.
Dehydration of an ethanol/water azeotrope by novel organic-inorganic hybrid membranes based on quaternized chitosan and tetraethoxysilane.
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DOI：
10.1021/bm0498880
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发表时间：
2004-05
影响因子：
6.2
通讯作者：
T. Uragami;Takuya Katayama;T. Miyata;H. Tamura;T. Shiraiwa;A. Higuchi
中科院分区：
文献类型：
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作者：
T. Uragami;Takuya Katayama;T. Miyata;H. Tamura;T. Shiraiwa;A. Higuchi
为了控制季铵化壳聚糖（q-Chito）膜的溶胀，采用溶胶-凝胶法制备了有机组分q-Chito和无机组分正硅酸乙酯（TEOS）的混合物，制备了新型的q-Chito/TEOS杂化膜。在乙醇/水共沸物的渗透汽化分离中，考察了正硅酸乙酯（TEOS）含量对q-Chito/TEOS杂化膜水/乙醇选择性的影响。混合膜含有高达45摩尔%的TEOS表现出更高的水/乙醇的选择性比q-Chito膜。这是由于通过形成交联结构抑制了膜的溶胀。然而，引入过量的TEOS导致杂化膜的更大溶胀。因此，含有大于45摩尔% TEOS的杂化膜的水/乙醇选择性低于q-Chito膜的水/乙醇选择性。详细讨论了q-Chito/TEOS杂化膜的结构与其在乙醇/水共沸物渗透汽化过程中的渗透分离特性之间的关系。
To control swelling of quaternized chitosan (q-Chito) membranes, mixtures of q-Chito as an organic component and tetraethoxysilane (TEOS) as an inorganic component were prepared using the sol-gel reaction, and novel q-Chito/TEOS hybrid membranes were formed. In the separation of an ethanol/water azeotrope by pervaporation, the effect of TEOS content on the water/ethanol selectivity of q-Chito/TEOS hybrid membranes was investigated. Hybrid membranes containing up to 45 mol % TEOS exhibited higher water/ethanol selectivity than the q-Chito membrane. This resulted from depressed swelling of the membranes by formation of a cross-linked structure. However, introduction of excess TEOS led to greater swelling of the hybrid membranes. Therefore, the water/ethanol selectivity of the hybrid membranes containing more than 45 mol % TEOS was lower than that of the q-Chito membrane. The relationship between the structure of q-Chito/TEOS hybrid membranes and their permeation and separation characteristics during pervaporation of an ethanol/water azeotrope is discussed in detail.