Zeolites and processes for their manufacture
AssigneeExxon Chemical Patents Inc.
InventorsJohannes Petrus Verduijn, Machteld M Mertens, Marc H Anthonis
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Abstract
Low temperature hydrothermal treatment of an LTL zeolite-producing mixture produces a colloidal suspension of the zeolite; the suspension may be used as seeds in Al-- and Ga--LTL zeolite manufacture.
Claims17
A process for the manufacture of a colloidal suspension of an LTL zeolite wherein a synthesis mixture having a composition, given in terms of molar proportions with the solid components being calculated in terms of their oxides, in the ranges:
- ______________________________________ K.sub.2 O:(K.sub.2 O + Na.sub.2 O) from 0.33 to 1:1 (K.sub.2 O + Na.sub.2 O):SiO.sub.2 from 0.35 to 0.5:1 SiO.sub.2 :Al.sub.2 O.sub.3 from 10 to 40:1 solvent free of ammonia:
- (K.sub.2 O + Na.sub.2 O) from 15 to 25:1 ______________________________________
- is subjected to thermal treatment at a temperature below 100.degree. C. for a time sufficient to form a colloidal suspension of an LTL zeolite having a particle size of at most 100 nm.
A process for the manufacture of an LTL zeolite which comprises forming a synthesis mixture having a composition, given in terms of molar proportions with the solid components calculated in terms of their oxides, in the ranges:
- ______________________________________ K.sub.2 O:(K.sub.2 O + Na.sub.2 O) from 0.60 to 1:1 (K.sub.2 O + Na.sub.2 O):SiO.sub.2 from 0.18 to 0.36:1 SiO.sub.2 :Ga.sub.2 O.sub.3 from 5 to 18:1 solvent:(K.sub.2 O + Na.sub.2 O) from 25 to 90:1 ______________________________________
- and also containing at least 0.005% by weight seed crystals of an LTL zeolite of particle size at most 100 nm, and subjecting the seed-containing synthesis mixture to a hydrothermal treatment at a temperature and for a time sufficient to form an LTL zeolite.
Dependencies are inferred from the claim text.