Adsorbents and adsorptive separation process
AssigneeThe BOC Group, Inc.
InventorsMartin Bulow, Frank R. Fitch, Adeola Florence Ojo
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Abstract
Adsorbent composites composed of microparticulate zeolites at least 90% of whose particles have a characteristic particle dimension not greater than about 0.6 micron and a macropore inert binder. The composites are useful for separating strongly adsorbed gas components from gas mixtures. Microparticulate type X zeolites composites are particularly useful for separating nitrogen or carbon dioxide from air.
Claims38
A porous composite comprising about 40 to about 95% by weight microparticulate zeolite, at least 90% of which has a particle size not greater than about 0.6 micron, and about 5 to about 60% by weight binder.
A method of producing microparticulate zeolite X comprising the steps:
- (a) forming a first aqueous solution of sodium aluminate and triethanolamine;
- (b) forming a second aqueous solution of sodium silicate and triethanolamine;
- (c) blending said first and second aqueous solutions with sufficient agitation to produce a uniform reaction mixture, the ratios of the components of said first and second aqueous solutions being such that in said reaction mixture the silica to alumina molar ratio is in the range of about 2:1 to about 3.5:1;
- the sodium oxide to silica molar ratio is in the range of about 1.25:1 to about 1.6:1;
- the triethanolamine to silica molar ratio is in the range of about 4:1 to about 6.5:1 ;
- and the water to silica molar ratio is in the range of about 250:1 to about 1000:1;
- (d) maintaining said reaction mixture at a temperature in the range of about 60 to about 100.degree. C. for a period of about 35 to about 40 days;
- and
- (e) recovering from said reaction mixture microparticulate zeolite X at least 90% of the particles of which have a particle size not greater than about 0.6 microns.
Dependencies are inferred from the claim text.