US4436938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of amines
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1982-08-31
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Granted: 1984-03-13
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Expires: 2002-08-31
Abstract
Abstract A process for the manufacture of methylamines comprises reacting a feed comprising methanol and/or dimethylether and ammonia over a binderless zeolite A catalyst, preferably a binderless zeolite 5A catalyst. Use of binderless zeolite 5A makes the process attractively selective to dimethylamine in preference to mono- and tri-methylamine. In addition, if the catalyst is essentially free of alkali metal it is not only more active than similar catalysts containing alkali metal but also considerably more selective.
Inventors
- 👤 Alan J. Tompsett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:25
CPC Classifications
C; C07; C07C; C07C209/00; C07C209/04; C07C209/14; C07C209/16
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
32 words
A process for the manufacture of methylamines which comprises reacting a feed comprising methanol, dimethylether or mixtures thereof and ammonia over a catalyst comprising binderless zeolite A in the alkaline earth form.
Claim 2
Dependent Claim
32 words
A process for the manufacture of methylamines which comprises reacting a feed comprising methanol, dimethylether or mixtures thereof and ammonia over a catalyst comprising binderless zeolite A in the alkaline earth form.
Claim 3
Dependent Claim
56 words
A process as claimed in claim 1 in which the process is operated at weight hourly alcohol space velocity in the range 0.2 to 0.75 hrs -1 and at an N/R ratio which is defined as moles of ammonia+ammonia equivalent of recycled amine moles of alkyl (alcohol+recycled amine) is in the range of 0.5 to 2.0.
Claim 4
Dependent Claim
18 words
A process as claimed in claim 1 in which the binderless zeolite A is in the calcium form.
Claim 5
Dependent Claim
24 words
A process as claimed in claim 1 in which the catalyst has a content of alkali metal which is less than 4% by weight.
Claim 6
Dependent Claim
17 words
A process as claimed in claim 4 in which the catalyst is essentially free of alkali metal.
Claim 7
Dependent Claim
23 words
A process as claimed in claim 1 in which the catalyst comprising binderless zeolite A has been aged before use in the process.
Claim 8
Dependent Claim
23 words
A process as claimed in claim 1 in which the process is operated at a temperature within the range 325° to 400° C.
Claim 9
Dependent Claim
25 words
A process as claimed in claim 1 in which at least some of the methylamine product is recycled over a catalyst comprising an aluminosilicate zeolite.
Claim 10
Dependent Claim
106 words
A process as claimed in claim 1 which comprises reacting methanol and/or dimethyl ether and ammonia in a first stage over a catalyst selective for the production of di-methylamine in preference to mono- and tri-methylamine and at a given N/R ratio, and in a second stage reacting at least some of the product from the first stage, optionally with additional fresh feed, over a selective catalyst which may be the same as or different from the catalyst in the first stage at a different N/R ratio to that used in the first stage, the catalyst in at least one of said stages comprising binderless zeolite A.
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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) | 1987-03-13 | 1987-09-12 | 1988-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-13 | 1991-09-12 | 1992-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-13 | 1995-09-12 | 1996-03-13 | $7700.00 | Window Closed / Lapsed |