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Application of thin film composite membranes to the membrane aromatic recovery system

机译:薄膜复合膜在膜芳烃回收系统中的应用

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The membrane aromatic recovery system (MARS) is a new membrane technology which recovers aromatic acids and bases. The first industrial installation has been operating at a Degussa site in the UK recovering cresols since 2002. The state of the art MARS technology employs a tubular silicone rubber membrane. However, this places some limitations on the process due to relatively low mass transfer rates and limited chemical resistance. In this paper, flat sheet composite membranes were investigated for application to the MARS process. In particular for recovery of compounds, such as 1,2-benzisothiazolin-3-one (BIT) which show low mass transfer rates through the current membrane. These composite membranes are comprised of a thin nonporous PDMS selective layer coated on a microporous support layer cast from polyacrylonitrile, polyvinylidene fluoride, polyetherimide or polyphenylenesulphone. The membranes have been characterised using SEM and gas permeation. The mass transfer of BIT through the composite membranes with no chemical reaction enhancement was an order of magnitude higher than through tubular silicone rubber membranes (10(-7) ms(-1) versus 10(-8) m s(-1)). With chemical reaction enhancement, the mass transfer increased by another order of magnitude to 1.6 x 10(-6) m s(-1) for BIT through a PVDF supported composite membrane. Mass transfer through the composite membrane was described well using analysis based on the resistance in series theory with chemical reaction. However, when a high osmotic pressure was applied across the membrane (molarity similar to 3 M), significant water transport occurred across the membrane. (c) 2005 Elsevier B.V. All rights reserved.
机译:膜芳烃回收系统(MARS)是一种新的膜技术,可回收芳族酸和碱。自2002年以来,第一套工业装置一直在英国的德固赛工厂运行,回收甲酚。最先进的MARS技术采用管状硅橡胶膜。然而,由于相对较低的传质速率和有限的耐化学性,这对方法有一些限制。本文研究了平板复合膜在MARS工艺中的应用。特别是对于化合物的回收,例如1,2-苯并噻唑啉-3-酮(BIT),其通过当前膜的传质速率低。这些复合膜由涂覆在由聚丙烯腈,聚偏二氟乙烯,聚醚酰亚胺或聚苯砜浇铸的微孔支撑层上的薄无孔PDMS选择性层组成。膜已使用SEM和气体渗透进行了表征。 BIT在没有化学反应增强的情况下通过复合膜的质量转移比通过管状硅橡胶膜的质量转移要高一个数量级(10(-7)ms(-1)对10(-8)m s(-1))。随着化学反应的增强,通过PVDF支撑的复合膜,BIT的传质又增加了一个数量级,达到1.6 x 10(-6)m s(-1)。通过基于化学反应的串联理论的阻力分析,很好地描述了通过复合膜的传质。然而,当在膜上施加高渗透压(摩尔浓度类似于3 M)时,在膜上会发生大量的水传输。 (c)2005 Elsevier B.V.保留所有权利。

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