Process for producing substantially binder-free zeolite
AssigneeExxon Chemical Patents Inc.
InventorJohannes P. Verduijn
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Abstract
Silica-bound extruded zeolites may be converted into binder-free zeolite aggregates by aging the zeolite in an aqueous ionic solution which contains hydroxy ions such that the initial molar ratio of OH-:SiO.sub.2 is up to 1.2 and which causes the silica binder to be converted substantially to zeolite of the type initially bound. Such extrudates have excellent mechanical strength and show advantageous properties such as adsorption comparable with non-extruded zeolite powder.
Claims36
A process for producing a zeolite containing less than 10 percent by weight silica binder, comprising aging at elevated temperature a silica-bound zeolite aggregate in an aqueous ionic solution which contains hydroxy ions such that the initial molar ratio of OH-:SiO.sub.2 is in the range of 0.1 up to 1.2 and which causes the silica binder to be converted to zeolite of the type initially bound or a type which is a crystallographic match for the zeolite initially bound, said silica-bound zeolite selected from the group consisting of MFI, KFI, Y, Beta, Omega, Chabasite, T, Offretite, ZSM-22, ZSM-23, titanosilicate, ZSM-34 and ZSM-12 type zeolites.
A process for producing a zeolite containing less than 10 percent by weight silica binder, comprising aging at elevated temperature a silica-bound MFI type zeolite aggregate in an aqueous ionic solution containing hydroxy ions such that the initial molar ratio of OH-:SiO.sub.2 is up to 1.2 and which causes the silica binder to be converted to zeolite MFI or a crystallographic match for zeolite MFI.
Dependencies are inferred from the claim text.