US4098820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of formamides
Assignee: UCB SA
•
Filing: 1977-03-10
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Granted: 1978-07-04
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Expires: 1997-03-10
Abstract
Abstract The invention relates to an improved process for the production of a formamide, wherein a current of a gas containing carbon monoxide is reacted at elevated temperature (50°-200° C) and pressure (5-110 bars) in a reaction zone with a recycled current of liquid reaction mixture containing (a) a nitrogen-containing compound selected from the group consisting of ammonia, a primary alkylamine and a secondary alkylamine (e.g. monomethylamine or dimethylamine); (b) a methanolic solution of an alkali metal or earth metal methoxide as catalyst, and (c) the formamide produced as reaction product, Part of the current of liquid reaction mixture being withdrawn in order to recover the formamide therefrom. The characteristic feature of the invention consists in that the recycled liquid reaction mixture is used for sucking and dispersing the current of gas in the reaction zone. Advantages of the process are: excellent heat exchange, high productivity and yield, absence of solid deposits on the internal surfaces of the apparatus, lower operating pressures and temperatures, use of apparatus of smaller dimensions, suppression of recycling of carbon monoxide, continuous operation etc.
Inventors
- 👤 Willy Couteau
- 👤 Jean Ramioulle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:12
CPC Classifications
C; C07; C07C; C07C231/00; C07C231/02; Y; Y10; Y10S; Y10S261/00; Y10S261/75
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
120 words
In a process for the production of a formamide, wherein a current of a gas containing carbon monoxide is reacted at elevated temperature and pressure in a reaction zone with a recycled current of liquid reaction mixture containing (a) a nitrogen-containing compound selected from the group consisting of ammonia, a primary alkylamine and a secondary alkylamine, (b) a methanolic solution of an alkali metal or alkaline earth metal methoxide as catalyst, and (c) the formamide produced as reaction product, part of the current of liquid reaction mixture being withdrawn in order to recover the formamide therefrom, the improvement which comprises using the recycled current of liquid reaction mixture for sucking and dispersing the current of gas in the reaction zone.
Claim 2
Dependent Claim
120 words
In a process for the production of a formamide, wherein a current of a gas containing carbon monoxide is reacted at elevated temperature and pressure in a reaction zone with a recycled current of liquid reaction mixture containing (a) a nitrogen-containing compound selected from the group consisting of ammonia, a primary alkylamine and a secondary alkylamine, (b) a methanolic solution of an alkali metal or alkaline earth metal methoxide as catalyst, and (c) the formamide produced as reaction product, part of the current of liquid reaction mixture being withdrawn in order to recover the formamide therefrom, the improvement which comprises using the recycled current of liquid reaction mixture for sucking and dispersing the current of gas in the reaction zone.
Claim 3
Dependent Claim
21 words
A process according to claim 1, wherein the temperature in the reaction zone is from about 50° to about 200° C.
Claim 4
Dependent Claim
21 words
A process according to claim 1, wherein the temperature in the reaction zone is from about 60° to about 100° C.
Claim 5
Dependent Claim
19 words
A process according to claim 1, wherein the pressure in the reaction zone is from 5 to 110 bars.
Claim 6
Dependent Claim
19 words
A process according to claim 1, wherein the pressure in the reaction zone is from 10 to 25 bars.
Claim 7
Dependent Claim
25 words
A process according to claim 1, wherein the alkylamine is an alkylamine the alkyl radical or radicals of which contains 1 or 2 carbon atoms.
Claim 8
Dependent Claim
12 words
A process according to claim 1, wherein the alkylamine is a methylamine.
Claim 9
Dependent Claim
22 words
A process according to claim 1, wherein the molar ratio of carbon monoxide to the nitrogen-containing compound is from 0,2 to 2,0.
Claim 10
Dependent Claim
22 words
A process according to claim 1, wherein the molar ratio of carbon monoxide to the nitrogen-containing compound is from 0,2 to 1,4.
Claim 11
Dependent Claim
31 words
A process according to claim 1, wherein the catalyst is used in an amount of from about 0,2 to about 4,0% by weight, referred to the amount of nitrogen-containing compound used.
Claim 12
Dependent Claim
31 words
A process according to claim 1, wherein the catalyst is used in an amount of from about 0,4 to about 2,5% by weight, referred to the amount of nitrogen-containing compound used.
Claim 13
Dependent Claim
12 words
A process according to claim 1, wherein the catalyst is sodium methoxide.
Claim 14
Dependent Claim
32 words
A process according to claim 1, wherein the surface contact area between the gas phase and the liquid phase is of from 750 to 5,000 sq.meters per cubic meter of liquid phase.
Claim 15
Dependent Claim
33 words
A process according to claim 1, wherein the surface contact area between the gas phase and the liquid phase is of from 1,000 to 2,000 s.q.meters per cubic meter of the liquid phase.
Claim 16
Dependent Claim
17 words
A process according to claim 1, wherein the gas containing carbon monoxide is substantially pure carbon monoxide.
Claim 17
Dependent Claim
26 words
A process according to claim 1, wherein the gas containing carbon monoxide is a mixture containing about 50% of carbon monoxide and about 50% of hydrogen.
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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) | 1981-07-03 | 1982-01-02 | 1982-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-03 | 1986-01-02 | 1986-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-03 | 1990-01-02 | 1990-07-04 | $7700.00 | Window Closed / Lapsed |