Membrane Recovery of Homogeneous Catalysts (TSE 99-D)

均相催化剂的膜回收 (TSE 99-D)

• 批准号: 9985552
• 负责人: Haskell Beckham
• 金额: $ 21万
• 依托单位: Georgia Tech Research Corporation
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-05-01 至 2004-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9985552&HistoricalAwards=false
• 关键词: Membrane; Recovery; Homogeneous; Catalysts; TSE

AbstractProposal number: CTS-9985552Proposal type: Response to NSF 99-108, NSF/EPA Technology for a Sustainable Environment ProgramPrincipal investigators: Mary Rezac and Haskell BeckhamAffiliation: Georgia Institute of Technology Membrane Recovery of Homogeneous CatalystsHomogeneous catalysts are employed for chemical production because of their high reaction rates and selectivity. However, recovery and recycle of these catalysts is difficult and produces significant waste (approximately 4 million tons in 1996). Conventional techniques are not well suited to this separation. This research program examines the ability of chemically stable membranes developed from crosslinked diacetylene-functionalized polymers to selectively recover homogeneous catalysts from either aqueous or non-aqueous reaction mixtures. If successful, this technology could greatly expand the use of highly selective but often expensive homogeneous catalysts and dramatically reduce the volume of undesired by-products formed via conventional heterogeneous catalysis systems.The hypothesis of this study is that the separation of an organic product from a metal-ligand catalyst can be achieved with an organic polymer membrane that provides selectivity based on differences in the diffusion rates of the two compounds. Tailoring of mobility-based selectivity can be realized through control of the molecular motion of the polymer chains. Selective crosslinking of the polymer matrix can be used to gain this control. Polymers topochemically crosslinked via a diacetylene functionality will be investigated to probe the ability of this unit to prevent polymer swelling and the concurrent loss of selectivity without markedly reducing transport rates of desired penetrants. The crosslink density of the samples will be systematically varied to evaluate the posed hypothesis. Measurement of the solubility and diffusion coefficient for each penetrant will be made. The performance of the membrane in the recovery of homogeneous catalyst and the subsequent activity of the recovered catalyst are being evaluated.

摘要提案编号：ccs -9985552提案类型：响应NSF 99-108， NSF/EPA可持续环境技术项目。主要研究者：Mary Rezac和Haskell beckha。隶属于乔治亚理工学院。均相催化剂的膜回收均相催化剂因其高反应速率和选择性而被广泛应用于化工生产。然而，这些催化剂的回收和再循环是困难的，并产生大量废物（1996年约400万吨）。传统技术不太适合这种分离。本研究项目考察了由交联二乙炔功能化聚合物开发的化学稳定膜从水或非水反应混合物中选择性回收均相催化剂的能力。如果成功，这项技术将极大地扩展高选择性但往往昂贵的均相催化剂的使用，并大大减少传统多相催化系统产生的不良副产物的体积。本研究的假设是，有机产物与金属配体催化剂的分离可以通过有机聚合物膜实现，该膜根据两种化合物的扩散速率差异提供选择性。通过控制聚合物链的分子运动，可以实现基于迁移率的选择性裁剪。聚合物基体的选择性交联可以用来获得这种控制。通过二乙炔功能进行拓扑化学交联的聚合物将被研究，以探测该单元防止聚合物膨胀和同时丧失选择性的能力，而不会显着降低所需渗透剂的运输速率。将系统地改变样品的交联密度，以评估所提出的假设。将测量每种渗透剂的溶解度和扩散系数。对膜在均相催化剂回收中的性能和回收催化剂的后续活性进行了评价。