US4528172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of zeolites
Assignee: Hoechst AG
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Filing: 1983-10-11
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Granted: 1985-07-09
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Expires: 2003-10-11
Abstract
Abstract The invention provides a process for the manufacture of zeolites of the ZSM-5 type by heating an aqueous solution or suspension containing a silicon dioxide source, alkali metal hydroxide and optionally an aluminum source until crystallization occurs. Furthermore, the solution or suspension contains an organic phosphorus compound which is selected from the group consisting of OPR 1 R 2 R 3 and PR 1 R 2 R 3 , in which R 1 , R 2 and R 3 , independently from one another, each are alkyl or alkoxy having each from 2 to 10 carbon atoms.
Inventors
- 👤 Hans-Peter Rieck
- 👤 Hans-Jurgen Kalz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:15
CPC Classifications
C; C01; C01B; C01B39/00; C01B39/02; C01B39/36; C01B39/365; C01B37/00; C01B37/02; C01B39/38; C01B39/40; Y; Y10; Y10S; Y10S423/00; Y10S423/22
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
78 words
A process for the manufacture of zeolites of the ZSM-5 type by heating an aqueous solution or suspension containing a silicon dioxide source, an organic phosphorus compound, and alkali metal hydroxide until crystallization occurs, wherein the organic phosphorus compound has the formula OPR 1 R 2 R 3 , of which R 1 , R 2 , and R 3 , independently from one another, each are alkyl or alkoxy having each from 2 to 10 carbon atoms.
Claim 2
Dependent Claim
78 words
A process for the manufacture of zeolites of the ZSM-5 type by heating an aqueous solution or suspension containing a silicon dioxide source, an organic phosphorus compound, and alkali metal hydroxide until crystallization occurs, wherein the organic phosphorus compound has the formula OPR 1 R 2 R 3 , of which R 1 , R 2 , and R 3 , independently from one another, each are alkyl or alkoxy having each from 2 to 10 carbon atoms.
Claim 3
Dependent Claim
18 words
The process as claimed in claim 1, wherein the organic phosphorus compound is tripropylphosphine oxide or tributylphosphine oxide.
Claim 4
Dependent Claim
16 words
The process as claimed in claim 1 wherein sodium hydroxide is used as alkali metal hydroxide.
Claim 5
Dependent Claim
19 words
The process as claimed in claim 1, wherein an alkali metal silicate is used as the silicon dioxide source.
Claim 6
Dependent Claim
20 words
The process as claimed in claim 1, wherein the radical R 1 is a C 2 -C 10 -alkyl group.
Claim 7
Dependent Claim
25 words
The process as claimed in claim 5, wherein R 2 and R 3 , independently from each other, are C 2 -C 10 -alkyl groups.
Claim 8
Dependent Claim
35 words
The process as claimed in claim 1, wherein R 1 , R 2 , and R 3 , independently from one another, are alkyl or alkoxy radicals each having from 2 to 4 carbon atoms.
Claim 9
Dependent Claim
24 words
The process as claimed in claim 1, wherein the aqueous solution or suspension to be heated has a pH of from 8 to 12.
Claim 10
Dependent Claim
19 words
A process as claimed in claim 1, wherein said aqueous solution or suspension additionally contains an aluminum oxide source.
References Cited (Backward Citations)
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-08 | 1989-01-07 | 1989-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-08 | 1993-01-07 | 1993-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-08 | 1997-01-07 | 1997-07-09 | $7700.00 | Window Closed / Lapsed |