Stabilization of bioethanol recovery with silicone rubber‐coated ethanol‐permselective silicalite membranes by controlling the pH of acidic feed solution
Stabilization of bioethanol recovery with silicone rubber‐coated ethanol‐permselective silicalite membranes by controlling the pH of acidic feed solution
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DOI：
10.1002/jctb.1229
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发表时间：
2005-04
影响因子：
3.4
通讯作者：
T. Ikegami;H. Negishi;D. Kitamoto;K. Sakaki;T. Imura;M. Okamoto;Y. Idemoto;N. Koura;T. Sano-
中科院分区：
文献类型：
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作者：
T. Ikegami;H. Negishi;D. Kitamoto;K. Sakaki;T. Imura;M. Okamoto;Y. Idemoto;N. Koura;T. Sano-
为了利用乙醇-过选择性硅石膜通过渗透汽化生产高浓度生物乙醇，研究了抑制乙醇发酵主要副产物琥珀酸在硅石晶体上的吸附技术。吸附量随着琥珀酸水溶液pH的降低而增加。当分离乙醇/水/琥珀酸三元混合物时，渗透蒸发性能也随pH的降低而降低。在5 ~ 7的pH范围内，分别包覆两种硅橡胶的硅石膜的渗透汽化性能比未包覆的硅石膜在乙醇/水/琥珀酸三元混合物中的渗透汽化性能显著提高。此外，当使用两种硅橡胶双包覆的硅石膜时，渗透蒸发性能在较低的pH值下保持稳定。在利用双层硅石膜渗透汽化分离生物乙醇的过程中，从发酵液中去除在约260 nm处紫外线吸收最大的积累物质被证明是有效渗透汽化的关键。版权所有©2005化工学会
In order to produce highly concentrated bioethanol by pervaporation using an ethanol-permselective silicalite membrane, techniques to suppress adsorption of succinic acid, which is a chief by-product of ethanol fermentation and causes the deterioration in pervaporation performance, onto the silicalite crystals was investigated. The amount adsorbed increased as the pH of the aqueous succinic acid solution decreased. The pervaporation performance also decreased with decreasing pH when the ternary mixtures of ethanol/water/succinic acid were separated. Using silicalite membranes individually coated with two types of silicone rubber, pervaporation performance was significantly improved in the pH range of 5 to 7, when compared with that of non-coated silicalite membranes in ternary mixtures of ethanol/water/succinic acid. Moreover, when using a silicalite membrane double-coated with the two types of silicone rubber, pervaporation performance was stabilized at lower pH values. In the separation of bioethanol by pervaporation using the double-coated silicalite membrane, removal of accumulated substances having an ultraviolet absorption maximum at approximately 260 nm from the fermentation broth proved to be vital for efficient pervaporation. Copyright © 2005 Society of Chemical Industry