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首页> 外文期刊>RSC Advances >Preparation and pervaporation characteristics of novel ethanol permselective polyelectrolyte-surfactant complex membranes
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Preparation and pervaporation characteristics of novel ethanol permselective polyelectrolyte-surfactant complex membranes

机译：新型乙醇渗透选择性聚电解质-表面活性剂复合膜的制备及渗透特性

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摘要

Recovery of ethanol from a low concentration aqueous solution is a critical step for biofuel production. Pervaporation as an energy-efficient separation technology is attracting great attention in ethanol retrieving. Here we introduce polyelectrolyte-surfactant complexes (PESCs) as membrane materials for ethanol recovery from aqueous solution. PESCs with a controlled degree of complexation (DC) were prepared by mixing polyacrylic acid sodium (PAANa) and hexadecyltrimethylammonium bromide (CTAB) at different pH values. Both the PESCs and their membranes (PESCMs) were characterized. Pervaporation data show that PESCMs could selectively transport ethanol molecules in the feed, and the PESCM with the highest hydrophobicity gives the optimum performance in terms of selectivity. For example, the most hydrophobic PESCM (DC 0.79) features the optimum separation factor of 5.38 coupled with a high flux of 4.23 kg m(-2) h(-1) in processing a 5 wt% ethanol-water feed mixture at 30 degrees C. The PESCM, which is low cost in terms of starting materials and manufacture engineering, represents an alternative membrane system with considerable potential for biofuel production.
机译：从低浓度水溶液中回收乙醇是生物燃料生产的关键步骤。全蒸发作为一种节能的分离技术在乙醇回收中引起了极大的关注。在这里，我们介绍聚电解质表面活性剂复合物（PESCs）作为膜材料，用于从水溶液中回收乙醇。通过在不同的pH值下混合聚丙烯酸钠（PAANa）和十六烷基三甲基溴化铵（CTAB）来制备具有控制的络合度（DC）的PESC。对PESC及其膜（PESCM）进行了表征。全蒸发数据表明，PESCM可以选择性地输送饲料中的乙醇分子，而疏水性最高的PESCM在选择性方面具有最佳性能。例如，疏水性最强的PESCM（DC 0.79）的最佳分离系数为5.38，在30度下处理5 wt％的乙醇-水进料混合物时，其最大通量为4.23 kg m（-2）h（-1） C. PESCM在原材料和制造工程方面成本低廉，是一种替代膜系统，具有很大的生物燃料生产潜力。

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