Synthesis of crystalline molecular sieves having the EUO framework type
AssigneeExxonMobil Chemical Patents Inc.
InventorMachteld M. W. Mertens
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Abstract
In a process for the synthesis of a crystalline molecular sieve material having the EUO framework type, a synthesis mixture is provided suitable for the formation of an EUO framework type molecular sieve and comprising N,N,N,N′,N′,N′-hexamethylhexanediammonium, Q, cations and a colloidal suspension of seed crystals of an EUO framework type molecular sieve. The synthesis mixture is crystallized and an EUO framework type molecular sieve in the form individual crystals and/or aggregates of crystals having an average size, d50, as measured by laser scattering, of less than 15 μm is recovered from the synthesis mixture.
Claims12
A process for the synthesis of a crystalline molecular sieve material having the EUO framework type, the process comprising:
- (a) providing a synthesis mixture suitable for the formation of an EUO framework type molecular sieve and comprising N,N,N,N′,N′,N′-hexamethylhexanediammonium, Q, cations and a colloidal suspension of seed crystals of an EUO framework type molecular sieve, wherein said seed crystals have an average diameter of 300 nanometers or less;
- (b) crystallizing said synthesis mixture;
- and
- (c) recovering from said synthesis mixture an EUO framework type molecular sieve in the form of individual crystals and/or aggregates of crystals having an average size, d50, as measured by laser scattering, of less than 15 μm.
A crystalline molecular sieve material having the EUO framework type and composed of individual crystals and/or aggregates of crystals having an average size, d50 as measured by laser scattering, of 1 to less than 2 μm and a span (d90−d10/d50) of 1.0 to 1.3.
A process for the synthesis of a crystalline molecular sieve having the EUO framework type by crystallization of a synthesis mixture suitable for the manufacture of that molecular sieve, the process comprising the step of adjusting the amount of colloidal seed crystals having an EUO framework type present in the synthesis mixture to control the particle size and/or span of the molecular sieve, wherein said amount of seeds is in a range of 0.1 ppm to 2,000 ppm by weight, based on the total weight of the synthesis mixture, wherein said colloidal seed crystals have an average diameter of 300 nanometers or less.
Dependencies are inferred from the claim text.