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US 4,603,040 AGranted
Massive bodies of Maximum Aluminum X-type zeolite
AssigneeAir Products and Chemicals, Inc.
InventorsSteven M. Kuznicki, Charles G. Coe, Richard J. Jenkins, Stephen A. Butter
Life of this patent
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Abstract
Maximum Aluminum X-type zeolite is prepared in the form of essentially binderless aggregates. In the optimal case, the composition possesses the maximum theoretical zeolite cation content in a wide-pored zeolite as a solid, massive body.
Claims6
A macroscopic monolithic body of self-bound zeolite comprising substantially Maximum Aluminum X-type zeolite.
A process for making self-bound monolithic bodies of Maximum Aluminum X-type zeolite from kaolin preforms including the steps of:
- (a) extruding a mixture, including kaolin and from 10 to 30% of a pore-forming material into a preform body;
- (b) removing substantially all of said pore-forming material from said preform, thereby creating voids wihin said body;
- (c) heating said body to a temperature above 600.degree. C. for a period of sufficient duration to permit substantially complete conversion of said kaolin to meta kaolin;
- (d) placing said body in an aqueous solution of NaOH and KOH such that the solution has an overall composition in the range:
- (Na.sub.2 O+K.sub.2 O) / SiO.sub.2 =2.0-5.0
- Na.sub.2 /(Na.sub.2 O+K.sub.2 O) =0.10-0.90
- H.sub.2 O/(Na.sub.2 O+K.sub.2 O) =5-50
- (e) crystallizing in situ zeolites in said body with agitation at a temperature at or above 50.degree. C. for a period of from 0.5 hours to 48 hours.
5 more elements
Dependencies are inferred from the claim text.