US5488165A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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 12:53
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.
References Cited (Backward Citations)
GB284245A
Cited
US3367884A
Cited
US3553278A
Cited
US3907711A
Cited
US4059543A
Cited
SU641983A1
Cited
JPS5547143A
Cited
US4254061A
Cited
EP0025693A1
Cited
EP0130407A1
Cited
US4623529A
Cited
US4918233A
Cited
EP0307239A2
Cited
US4983560A
Cited
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 |