Crosslinkable mixed matrix membranes for the purification of natural gas

Nanocomposite;Mixed matrix membrane;Polyimide;Gas separation;Crosslinkable polymer membrane

Ward, Jason Keith ; Chemical Engineering

University:Georgia Institute of Technology

Department:Chemical Engineering

关键词: Nanocomposite;    Mixed matrix membrane;    Polyimide;    Gas separation;    Crosslinkable polymer membrane;   

Others  :  https://smartech.gatech.edu/bitstream/1853/39465/1/ward_jason_k_201005_phd.pdf

美国|英语

来源: SMARTech Repository

【 摘 要 】

Mixed matrix nanocomposite membranes composed of a crosslinkable polyimide matrix and high-silica molecular sieve particles were developed for purifying natural gas.It was shown that ideal mixed matrix effects were not possible without sieve surface modification.A previously developed Grignard procedure was utilized to deposit magnesium hydroxide nanostructures on the sieve surface in order to enhance polymer adhesion.Analyses of Grignard-treated sieves pointed to the formation of non-selective voids within the surface deposited layer.These voids were suspected to lead to lower-than-expected membrane performance.In order to improve membrane transport, a reactive sizing procedure was developed to fill these voids with polyimide-miscible material.In a serendipitous discovery, as-received sieves--when treated with this reactive sizing procedure--resulted in nearly identical membrane performance as reactive-sized, Grignard-treated sieves.This observation lead to the speculation of a non-ideal transport mechanism in mixed matrix membranes.