Low alkaline inverted in-situ crystallized zeolite membrane

Details Low alkaline inverted in-situ crystallized zeolite membrane Low alkaline inverted in-situ crystallized zeolite membrane

1997-03-07

1998-12-15

Bos, Steven

Chemistry of hydrocarbon compounds

Purification, separation, or recovery

By membrane, selective septum, or coalescer

585818, 95116, 95144, 95147, C07C 7144

Patent

active

058499806

ABSTRACT:
Applicant has discovered a new zeolite membrane and a process for preparing the same. The membrane is unique in that the zeolite crystals making up the membrane pack in a manner such that the membrane is essentially continuous with no large scale voids even when the membrane is <10 .mu.m thick. Thus, the present invention is directed toward a zeolite membrane wherein said membrane is comprised of a porous substrate and a layer of zeolite crystals wherein said layer of zeolite crystals is a polycrystalline layer with at least 99% of said zeolite crystals having at least one point between adjacent crystals that is .ltoreq.20 .ANG. and wherein at least 90% of said crystals have widths of from about 2 to about 50 microns and wherein at least 75% of said crystals have a thickness of within 20% of the average crystal thickness and wherein said membrane has at most 1 V % voids in said zeolite layer.

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Synthesis and characterization of a pure zeolitic membrane, Tsikoyiannis and Haag, Zeolites, 1992, vol. 12, Feb., pp. 126-130.

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