Synthesis of crystalline molecular sieves having the EUO framework type

Patent metadata

Field	Value
Publication number	US-9789477-B2
Application number	US-201314399094-A
Country	US
Kind code	B2
Filing date	Jun 7, 2013
Priority date	Jun 18, 2012
Publication date	Oct 17, 2017
Grant date	Oct 17, 2017

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, d 50 , as measured by laser scattering, of less than 15 μm is recovered from the synthesis mixture.

First claim

The invention claimed is:

1. 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, d 50 , as measured by laser scattering, of less than 15 μm.

2. The process of claim 1 , wherein said individual crystals and/or aggregates of crystals have an average size, d 50 , as measured by laser scattering, of less than 5 μm.

3. The process of claim 1 , wherein said individual crystals and/or aggregates of crystals have a span (d 90 −d 10 /d 50 ) of less than 2.0.

4. The process of claim 1 , wherein the synthesis mixture contains from about 0.1 ppm to about 2,000 ppm by weight of said seed crystals of the EUO framework type, based on the total weight of the synthesis mixture.

5. The process of claim 1 , wherein the synthesis mixture contains from 1 ppm to 500 ppm by weight of seed crystals of the EUO framework type, based on the total weight of the synthesis mixture.

6. The process of claim 1 , wherein the synthesis mixture further comprises a source of an alkali or alkaline earth metal (M), a source of an oxide of a tetravalent element Y, a source of a trivalent element X, and water, and has a composition, in terms of mole ratios, within the following ranges:
YO 2 /X 2 O 3 at least 30;
H 2 O/YO 2 about 15 to about 80;
OH − /YO 2 about 0.2 to about 0.8;
M/YO 2 about 0.2 to about 0.8; and
Q/YO 2 about 0.05 to about 0.5.

7. The process of claim 1 , wherein the crystallizing (b) is conducted at a temperature of 150 to 200° C.

8. A crystalline molecular sieve material having the EUO framework type produced by the process of claim 1 .

9. A hydrocarbon conversion process comprising contacting a hydrocarbon feedstock under conversion conditions with an active form of the molecular sieve of claim 8 .

10. A crystalline molecular sieve material having the EUO framework type and composed of individual crystals and/or aggregates of crystals having an average size, d 50 as measured by laser scattering, of 1 to less than 2 μm and a span (d 90 −d 10 /d 50 ) of 1.0 to 1.3.

11. 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.

12. The process of claim 11 , wherein said amount of seeds is in the range of 1 ppm to 500 ppm by weight, based on the total weight of the synthesis mixture.

Assignees

• Exxonmobil Chemical Patents Inc

Inventors

• Mertens Machteld M W

Classifications

• B01J35/77

  Compounds characterised by their crystallite size · CPC title

• C07C2529/70

  of types characterised by their specific structure not provided for in groups C07C2529/08 - C07C2529/65 · CPC title

• C01P2004/03

  obtained by SEM · CPC title

• B01J29/7023 Primary

  EUO-type, e.g. EU-1, TPZ-3 or ZSM-50 · CPC title

• C10G45/12

  containing crystalline alumino-silicates, e.g. molecular sieves · CPC title