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US 7,482,300 B2Granted
High activity ZSM-48 and methods for dewaxing
AssigneeExxonMobil Research and Engineering Company
InventorsWenyih F. Lai, Terry E. Helton, Dominick N. Mazzone
Life of this patent
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Abstract
This invention relates to a high activity ZSM-48. More particularly, a high activity ZSM-48 with defined purity is prepared, the ZSM-48 being free of non-ZSM-48 seed crystals and ZSM-50.
Claims19
A composition comprising ZSM-48 crystals having a silica:alumina molar ratio of 110 or less that is free of non-ZSM-48 seed crystals and free of ZSM-50,
- wherein the ZSM-48 crystals are free of crystals having a fibrous morphology.
A method for making as-synthesized ZSM-48 crystals containing a hexamethonium structure directing agent, wherein the as-synthesized ZSM-48 crystals are free of ZSM-50 and non-ZSM-48 seed crystals, the method comprising:
- preparing an aqueous mixture of silica or silicate salt, alumina or aluminate salt, hexamethonium salt and alkali base wherein the mixture has the following molar ratios:
- silica:alumina from 70 to 110, base:silica from 0.1 to 0.3 and hexamethonium salt:silica from 0.01 to 0.05;
- and
- heating the mixture with stirring for a time and temperature sufficient for crystal formation.
1 more element
Dependencies are inferred from the claim text.