US4313003A
Expired / Lapsed
US
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Preparation of dimethylamine
Assignee: EIDP Inc
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Filing: 1980-06-06
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Granted: 1982-01-26
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Expires: 2000-06-06
Abstract
Abstract Improved continuous process for disproportionating monomethylamine to dimethylamine and ammonia, said process comprising passing monomethylamine over the crystalline aluminosilicate catalyst selected from (a) mordenite wherein the primary cation is Na, HNa having at least 2% Na, Mg, Ca, Sr or Ba (b) ferrierite wherein the primary metal cation is Na, K, Mg, Ca, Sr or Ba (c) clinoptilolite and (d) phillipsite, at a temperature of 250°-475° C. and a pressure of 7-7000 kPa, at a feed rate of 0.1-10 g of monomethylamine/g of catalyst per hour, at a monomethylamine conversion of 15-75%.
Inventors
- 👤 Frank J. Weigert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:06
CPC Classifications
C; C07; C07C; C07C209/00; C07C209/64
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
94 words
Improved continuous process for disproportionating monomethylamine to dimethylamine and ammonia, said process comprising passing monomethylamine over the crystalline aluminosilicate catalyst selected from (a) mordenite wherein the primary cation is Na, HNa having at least 2% Na by weight, Mg, Ca, Sr or Ba (b) ferrierite wherein the primary metal cation is Na, K, Mg, Ca, Sr or Ba (c) clinoptilolite and (d) phillipsite, at a temperature of 250°-475° C. and a pressure of 7-7000 KPa, at a feed rate of 0.1-10 g of monomethylamine/g of catalyst per hour, at a monomethylamine conversion of 15-75%.
Claim 2
Dependent Claim
94 words
Improved continuous process for disproportionating monomethylamine to dimethylamine and ammonia, said process comprising passing monomethylamine over the crystalline aluminosilicate catalyst selected from (a) mordenite wherein the primary cation is Na, HNa having at least 2% Na by weight, Mg, Ca, Sr or Ba (b) ferrierite wherein the primary metal cation is Na, K, Mg, Ca, Sr or Ba (c) clinoptilolite and (d) phillipsite, at a temperature of 250°-475° C. and a pressure of 7-7000 KPa, at a feed rate of 0.1-10 g of monomethylamine/g of catalyst per hour, at a monomethylamine conversion of 15-75%.
Claim 3
Dependent Claim
28 words
Process of claim 1 wherein the temperature is 350°-400° C., the pressure is 70-3000 kPa and the feed rate is 0.5-2 g of monomethylamine/g of catalyst per hour.
Claim 4
Dependent Claim
9 words
Process of claim 1 wherein the monomethylamine is anhydrous.
Claim 5
Dependent Claim
11 words
Process of claim 1 wherein the monomethylamine is admixed with water.
Claim 6
Dependent Claim
10 words
Process of claim 1 wherein the catalyst is sodium mordenite.
Claim 7
Dependent Claim
17 words
Process of claim 1 wherein the catalyst is hydrogen-sodium mordenite having at least 2% Na by weight.
Claim 8
Dependent Claim
10 words
Process of claim 1 wherein the catalyst is calcium mordenite.
Claim 9
Dependent Claim
10 words
Process of claim 1 wherein the catalyst is natural ferrierite.
Claim 10
Dependent Claim
18 words
Process of claim 1 wherein the catalyst is natural ferrierite which has been subjected to calcium ion exchange.
References Cited (Backward Citations)
US1926691A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-01-25 | 1985-07-27 | 1986-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-25 | 1989-07-27 | 1990-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-25 | 1993-07-27 | 1994-01-26 | $7700.00 | Window Closed / Lapsed |