Patent US5488165A successfully refreshed from Google Patents.
US5488165A
Expired / Lapsed
US
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Process for the production of methyl amines
Assignee: Zeofuels Research Pty Ltd
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Filing: 1991-12-30
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Granted: 1996-01-30
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Expires: 2011-12-30
Abstract
Abstract A modified natural clinoptilolite, produced by treating a natural clinoptilolite with a suitable mineral acid or with a suitable alkali and then with a suitable mineral acid, is used as a catalyst in a process for the conversion of methanol and ammonia to give a product containing at least 50% by weight of monomethylamine.
Inventors
- 👤 Graham J. Hutchin
- 👤 Themistoclis Themistocleous
- 👤 Richard G. Copperthwaite
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:35
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/06; B01J29/00; B01J29/04; B01J29/06; B01J29/70; C; C07; C07C; C07C209/00; C07C209/04; C07C209/14; C07C209/16; B01J2229/00; B01J2229/30; B01J2229/37
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
207 words
A process for the conversion of methanol and ammonia to give a product containing at least 70% by weight of monomethylamine in a reactor in the presence of a modified natural clinoptilolite catalyst produced by treating a natural clinoptilolite with either (1) a mineral acid at a concentration of greater than 1M for a treatment time of longer than 24 hours and at a treatment temperature of from 40° C. to 80° C. inclusive; or (2) an alkali at a concentration greater than 0.5M for a treatment time of longer than 1 hour at a treatment temperature of from 30° C. to 80° C. inclusive, washing the resulting product, and treating the resulting product with a mineral acid at a concentration of greater than 0.1M for a treatment time of longer than 1 hour and at a treatment temperature of from 40° C. to 80° C. inclusive which includes the steps of: (a) feeding the methanol and ammonia to the reactor containing the catalyst; (b) converting the methanol and the ammonia in the reactor in the presence of the catalyst at a temperature of from 300° C. to 500° C. inclusive, and at a pressure of from 1 to 20 atmospheres inclusive; and (c) recovering the product.
Claim 2
Dependent Claim
207 words
A process for the conversion of methanol and ammonia to give a product containing at least 70% by weight of monomethylamine in a reactor in the presence of a modified natural clinoptilolite catalyst produced by treating a natural clinoptilolite with either (1) a mineral acid at a concentration of greater than 1M for a treatment time of longer than 24 hours and at a treatment temperature of from 40° C. to 80° C. inclusive; or (2) an alkali at a concentration greater than 0.5M for a treatment time of longer than 1 hour at a treatment temperature of from 30° C. to 80° C. inclusive, washing the resulting product, and treating the resulting product with a mineral acid at a concentration of greater than 0.1M for a treatment time of longer than 1 hour and at a treatment temperature of from 40° C. to 80° C. inclusive which includes the steps of: (a) feeding the methanol and ammonia to the reactor containing the catalyst; (b) converting the methanol and the ammonia in the reactor in the presence of the catalyst at a temperature of from 300° C. to 500° C. inclusive, and at a pressure of from 1 to 20 atmospheres inclusive; and (c) recovering the product.
Claim 3
Dependent Claim
18 words
A process according to claim 1 wherein 90% or more by weight of the methyl amines is monomethylamine.
Claim 4
Dependent Claim
55 words
A process according to claim 1 wherein the modified clinoptilolite is produced by treating the natural clinoptilolite with hydrochloric acid at a concentration of from greater than 1M up to and including 5M for a treatment time of longer than 24 hours and at a treatment temperature of from 40° C. to 80° C. inclusive.
Claim 5
Dependent Claim
110 words
A process according to claim 1 wherein the modified clinoptilolite is produced by treating a natural clinoptilolite with sodium hydroxide at a concentration of from greater than 0,5M up to and including 5M, for a treatment time of longer than 1 hour up to and including 48 hours and at a treatment temperature of 30° C. to 80° C. inclusive, washing the resulting product, and treating the resulting product with hydrochloric acid at a concentration of greater than 0,1M up to and including 2M for a treatment time of longer than 1 hour up to and including 48 hours and at a treatment temperature of from 40° to 80° C.
Claim 6
Dependent Claim
32 words
A process according to claim 1 wherein the modified clinoptilolite is calcined at a calcining temperature of from 400° C. to 500° C. inclusive for a calcining time of from 3 hours.
Claim 7
Dependent Claim
22 words
A process according to claim 1 wherein the modified natural clinoptilolite is produced starting from a natural clinoptilolite from Zululand, South Africa.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-01-29 | 1999-07-31 | 2000-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-01-29 | 2003-07-31 | 2004-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-01-29 | 2007-07-31 | 2008-01-30 | $7700.00 | Window Closed / Lapsed |