High throughput process for manufacturing molecular sieves of MFI framework type

Patent metadata

Field	Value
Publication number	US-9079809-B2
Application number	US-201414159166-A
Country	US
Kind code	B2
Filing date	Jan 20, 2014
Priority date	Feb 14, 2006
Publication date	Jul 14, 2015
Grant date	Jul 14, 2015

Abstract

A process for converting hydrocarbons comprising the step of contacting said hydrocarbons under conversion conditions with a crystalline molecular sieve having a pore size in the range of from about 2 to about 19 Å, said molecular sieve made by a method comprising the steps of (a) providing a mixture comprising at least one source of ions of tetravalent element (Y), at least one trivalent element hydroxide source (OH − ), and water, said mixture having a solid-content in the range of from about 15 wt. % to about 50 wt. %. %, preferably of from about 20% to about 30%; and (b) treating said mixture to form the desired crystalline molecular sieve with stirring at crystallization conditions sufficient to obtain a weight hourly throughput from about 0.005 to about 1 hr −1 , wherein said crystallization conditions comprise a temperature in the range of from about 200° C. to about 500° C. and a crystallization time less than 100 hr, wherein said crystalline molecular sieve has a zeolite framework type of MFI.

First claim

We claim:

1. A process for converting hydrocarbons comprising the step of contacting said hydrocarbons under conversion conditions with a crystalline molecular sieve having a pore size in the range of from about 2 to about 19 Å, said molecular sieve made by a method comprising the steps of:
(a) providing a mixture comprising at least one source of ions of tetravalent element (Y), at least one trivalent element hydroxide source (OH − ), and water, said mixture having a solid-content in the range of from about 20% to about 30%, wherein said solid-content is measured as the weight of said tetravalent element and said weight of said trivalent element expressed in terms of their oxides divided by the weight of said water in said mixture as a percentage:

solid
⁢

-

⁢
content

=

said
⁢

⁢
weight
⁢

⁢
of
⁢

⁢
said
⁢

⁢
oxides
⁢

⁢
in
⁢

⁢
said
⁢

⁢
mixture
×
100
⁢
%

said
⁢

⁢
weight
⁢

⁢
of
⁢

⁢
said
⁢

⁢
water
⁢

⁢
in
⁢

⁢
said
⁢

⁢
mixture

;

 and
(b) treating said mixture to form said crystalline molecular sieve with stirring at crystallization conditions sufficient to obtain a weight hourly throughput from about 0.005 to about 1 hr −1 , wherein said crystallization conditions comprise a temperature in the range of from about 200° C. to about 500° C. and a crystallization time less than 100 hr, wherein said crystalline molecular sieve has a zeolite framework type of MFI.

2. The process recited in claim 1 , wherein said crystalline molecular sieve formed in step (b) is substantially free of non-crystalline material.

3. The process recited in claim 1 , wherein said weight hourly throughput is in the range of from about 0.008 to about 1 hr −1 .

4. The process recited in claim 1 , wherein said mixture comprises a structure-directing agent.

5. The process recited in claim 1 , wherein said temperature range is from about 225° C. to about 250° C.

6. The process recited in claim 1 , wherein said mixture further comprises from about 0.01 to 20 wt. % based on the total weight of said mixture of at least one seed source.

7. The process recited in claim 1 , wherein said trivalent element is aluminum.

8. The process recited in claim 1 , wherein said crystallization temperature is in the range of from about 200° C. to about 300° C., and crystallization time is less than 72 hr.

9. The process recited in claim 1 , wherein said crystallization temperature is in the range of from about 200° C. to about 250° C., and crystallization time is less than 5 hr.

10. The process recited in claim 1 , wherein said crystalline molecular sieve comprises ZSM-5.

11. The process recited in claim 1 , wherein said tetravalent element is silicon.

12. The process recited in claim 1 , further comprising the step of: (c) separating said MFI framework type crystalline molecular sieve.

Assignees

• Exxonmobil Chem Patents Inc

Inventors

• Johnson Ivy Dawn
• Lai Wenyih Frank

Classifications

• C07C2/66

  Catalytic processes · CPC title

• C10G45/64

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

• C07B37/04 Primary

  Substitution · CPC title

• C07C15/085

  Isopropylbenzene · CPC title

• B01J29/86

  Borosilicates; Aluminoborosilicates {(B01J29/005 takes precedence)} · CPC title