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.

这个小型企业创新研究阶段I项目提出了一种自限的方法，以修复面向C的沸石分子筛膜中的缺陷。在这个项目中，我们将使用一种自限制的催化低温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温度约60°C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〜400c，通过促进交联，以使硅酸盐沉积物致密，从而进一步降低了有缺陷的晶界区域中的孔径。这个过程将以自限的方式堵塞有缺陷的晶界，以至于孔径约为5-6埃，而不会影响主膜基质，并大大提高了分子筛膜的气体选择性。如果成功的话，这项研究的直接益处是将P-二甲苯与O-二甲苯分离的气体选择性增强。二甲苯是美国生产的前30种化学物质之一。目前，它的年产量为2200万吨。用MFI膜分离的二甲苯分离为P-二甲苯生产提供了经济和连续的替代方案。