SBIR Phase I: A Self-Limited Method to Improve the Gas Selectivity of Zeolite Microporous Membranes

SBIR第一阶段：提高沸石微孔膜气体选择性的自限法

• 批准号: 0611004
• 负责人: Yiqiao Chen
• 金额: --
• 依托单位: SVT ASSOCIATES, INCORPORATED
• 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: 2006-07-01 至 2007-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0611004&HistoricalAwards=false
• 关键词: SBIR; Phase; Self; Limited; Method

This Small Business Innovation Research Phase I project proposes a self-limited method to repair defects in c-oriented zeolite molecular sieve membranes. In this project, we will use a self-limited catalyzed low temperature method to grow silicate coatings inside the defective membrane regions. The use of catalysts will enable the deposition to proceed at temperatures ~ 60C and only occur in pores with a diameter of 7 angstroms. After the deposition, the membrane will be heated up to ~400C to densify the silicate deposit by promoting cross-linking, which further reduces the pore size in the defective grain boundary regions. This process will plug the defective grain boundaries in a self-limited manner down to a pore size of ~ 5-6 angstroms, without affecting the main membrane matrix and greatly improve the gas selectivity of the molecular sieve membranes. If successful, the direct benefit from this research is much enhanced gas selectivity for separating p-xylene from o-xylene isomers. Xylene is one of the top 30 chemicals produced in the United States in terms of volume. Currently, it has a yearly production volume of 22 Million metric tons. Xylene separation with MFI membranes offers an economic and continuous alternative for p-xylene production.

这个小企业创新研究第一阶段项目提出了一种自限性的方法来修复c-取向沸石分子筛膜的缺陷。在这个计画中，我们将使用一种自限催化低温的方法，在有缺陷的膜区域内生长硅酸盐涂层。催化剂的使用将使沉积能够在约60 ℃的温度下进行，并且仅发生在直径为7埃的孔中。沉积后，将膜加热至~ 400 ℃，以通过促进交联使硅酸盐存款致密化，这进一步减小了有缺陷的晶界区域中的孔径。该方法将以自限方式堵塞有缺陷的晶界至约5-6埃的孔径，而不影响主膜基质，并大大提高分子筛膜的气体选择性。如果成功的话，这项研究的直接好处是大大提高了从邻二甲苯异构体中分离对二甲苯的气体选择性。二甲苯是美国产量最大的30种化学品之一。目前，它的年产量为2200万吨。采用MFI膜分离二甲苯为对二甲苯生产提供了一种经济、连续的替代方案。