Carbon Dioxide-Selective Membranes

二氧化碳选择性膜

• 批准号: 0625758
• 负责人: Winston Ho
• 金额: --
• 依托单位: Ohio State University Research Foundation -DO NOT USE
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-08-01 至 2010-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0625758&HistoricalAwards=false
• 关键词: Carbon; Dioxide; Selective; Membranes

Abstract Proposal Title:Carbon Dioxide-Selective Membranes, Proposal Number: CTS-0625758, Principal Investigator: Winston Ho, Institution: Ohio State UniversityAbstract:The state-of-the-art process for the removal of carbon dioxide from gases, including synthesis gas for hydrogen and ammonia production and natural gas for its purification, uses aqueous amine solutions. The state-of-the-art process has certain draw backs and it therefore is important to develop an effective process with both capital and energy savings. The proposed research is aimed at a novel approach using a CO2-selective membranes. This novel approach combines the absorption and stripping of CO2, carried out in 2 separate steps in the commercial technology, into a one-step membrane process. This one-step process not only simplifies the separation process, but also eliminates the capital-intensive equipment of the commercial technology. This one-step process also overcomes the thermodynamic solubility limit of aqueous amine solutions. The specific objective of this proposal is to study the effect of steric hindrance, via incorporating sterically hindered amines in polymer membranes, on CO2 removal. This PI and his coworkers have shown that sterically hindered amines have much higher CO2 and H2S absorption capacities (about 60% higher) than unhindered amines. It is important to see if we can extend this significant steric effect from the aqueous amine solution to the solid polymeric membrane phase. This is the first of the kind of membranes capable of possessing high CO2 permeability and CO2/H2 selectivity at relatively high temperatures (100 180oC) needed for energy-efficient syngas purification. This proposed work not only is of a great scientific interest but also may provide improved membranes of significant technological importance. Potential broader impacts of the project are significant as this research is aimed at the novel CO2-selective membrane approach to overcome many deficiencies of the commercial gas treatment technology. This novel approach combines the absorption and stripping of CO2, carried out in 2 separate steps in the commercial technology, into a one-step membrane process. This one-step process not only simplifies the separation process, but also eliminates the needs for the absorber, the regenerator, two pumps for the loaded and regenerated amine solutions, and the pumping operations between the absorber and regenerator. This one-step process also overcomes the thermodynamic solubility limit of aqueous amine solution. Thus, this membrane approach will have both significant capital and energy savings. The membranes derived from this proposal have many potential applications including the purification of synthesis gas to produce high purity hydrogen for fuel cells, CO2 capture from flue gas for its sequestration, and CO2 removal from biogas, natural gas, confined space air, and ambient air.

摘要提案标题：二氧化碳选择性膜，提案编号：CTS-0625758，主要研究者：Winston Ho，机构：俄亥俄州州立大学摘要：从气体中去除二氧化碳的最先进工艺，包括用于氢气和氨生产的合成气和用于其纯化的天然气，使用胺水溶液。现有技术的方法具有某些缺点，因此重要的是开发一种既节省资金又节省能量的有效方法。拟议的研究旨在使用CO2选择性膜的新方法。这种新方法将CO2的吸收和汽提（在商业技术中以2个单独的步骤进行）结合到一步膜过程中。这种一步法不仅简化了分离过程，而且消除了商业技术的资本密集型设备。该一步法还克服了胺水溶液的热力学溶解度极限。该提案的具体目标是研究空间位阻的影响，通过将空间位阻胺在聚合物膜中，CO2去除。该PI和他的同事已经表明，空间位阻胺具有比无位阻胺高得多的CO2和H2S吸收能力（高约60%）。重要的是看看我们是否可以将这种显著的空间效应从胺水溶液扩展到固体聚合物膜相。这是第一种膜能够拥有高CO2渗透性和CO2/H2选择性在相对较高的温度（100 - 180 ℃）所需的节能合成气净化。这项工作不仅具有重大的科学意义，而且可能提供具有重大技术意义的改进膜。该项目的潜在更广泛的影响是显着的，因为这项研究的目的是在新的二氧化碳选择性膜的方法，以克服商业气体处理技术的许多不足之处。这种新方法将CO2的吸收和汽提（在商业技术中以2个单独的步骤进行）结合到一步膜过程中。这种一步法不仅简化了分离过程，而且消除了对吸收器、再生器、用于负载和再生胺溶液的两个泵以及吸收器和再生器之间的泵送操作的需要。该一步法还克服了胺水溶液的热力学溶解度极限。因此，这种膜方法将具有显著的资本和能量节省。从该提议衍生的膜具有许多潜在的应用，包括合成气的纯化以产生用于燃料电池的高纯度氢气，从烟道气中捕获CO2以用于其封存，以及从生物气、天然气、受限空间空气和环境空气中去除CO2。