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US4745207A
Expired / Lapsed
US
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Preparation of the reaction products of hydrogen cyanide
Assignee: BASF SE
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Filing: 1985-11-25
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Granted: 1988-05-17
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Expires: 2005-11-25
Abstract
Abstract Reaction products of hydrogen cyanide are prepared by a process in which hydrogen cyanide prepared in a conventional manner by pyrolysis at from 250° to 650° C. over a solid under from 5 to 200 mbar is cooled to a temperature of from 200° to -10° C. together with the other pyrolysis products, the hydrogen cyanide is then fed to a chemisorption reaction with a base or with a carbonyl compound, and the reaction products of hydrogen cyanide which are formed therein are removed from the system and brought to atmospheric pressure. In this process, the handling of large amounts of hydrogen cyanide is avoided.
Inventors
- 👤 Fritz Brunnmueller
- 👤 Karlheinz Stecher
- 👤 Michael Kroener
- 👤 Rolf Schneider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:26
CPC Classifications
C; C01; C01C; C01C3/00; C01C3/02; C01C3/04; C07; C07C; C07C253/00; C07C253/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
173 words
A process for the preparation of a compound which is the reaction product of a carbonyl-containing compound and hydrogen cyanide, which comprises: (a) forming HCN by the pyrolysis of formamide or a compound of the formula: ##STR5## wherein R, R 1 , R 2 and R 3 are each H or C 1 -C 6 alkyl, or R 1 and R 2 or R 2 and R 3 together form a carbocyclic ring of 5 or 6 carbon atoms, and R 4 is H or C 1 -C 6 alkyl, at from 250°-650° C. over a solid catalyst and under a pressure of 5-200 mbar; (b) cooling said formed HCN and other products formed by pyrolysis, still under a pressure of 5-200 mbar to a temperature in the range of from 200° to -10° C., thereby separating uncondensed HCN from said other products; (c) feeding the cooled uncondensed HCN under a pressure of 5-200 mbar to a chemisorption reaction with a carbonyl-containing compound; and (d) removing said reaction product from the reaction mixture.
Claim 2
Dependent Claim
173 words
A process for the preparation of a compound which is the reaction product of a carbonyl-containing compound and hydrogen cyanide, which comprises: (a) forming HCN by the pyrolysis of formamide or a compound of the formula: ##STR5## wherein R, R 1 , R 2 and R 3 are each H or C 1 -C 6 alkyl, or R 1 and R 2 or R 2 and R 3 together form a carbocyclic ring of 5 or 6 carbon atoms, and R 4 is H or C 1 -C 6 alkyl, at from 250°-650° C. over a solid catalyst and under a pressure of 5-200 mbar; (b) cooling said formed HCN and other products formed by pyrolysis, still under a pressure of 5-200 mbar to a temperature in the range of from 200° to -10° C., thereby separating uncondensed HCN from said other products; (c) feeding the cooled uncondensed HCN under a pressure of 5-200 mbar to a chemisorption reaction with a carbonyl-containing compound; and (d) removing said reaction product from the reaction mixture.
Claim 3
Dependent Claim
18 words
A process as claimed in claim 1, wherein formamide is used for the preparation of the hydrogen cyanide.
Claim 4
Dependent Claim
21 words
A process as claimed in claim 1, wherein the carbonyl compound used is an aldehyde of 1 to 4 carbon atoms.
Claim 5
Dependent Claim
15 words
A process as claimed in claim 1, wherein the carbonyl compound used is a ketone.
Claim 6
Dependent Claim
32 words
A process as claimed in claim 1, wherein an amine of the formula ##STR6## where R 1 and R 2 are each C 1 -C 8 -alkyl or H, is additionally used.
Claim 7
Dependent Claim
26 words
A process as claimed in claim 1, wherein the chemisorption is carried out under from 5 to 140 mbar and at from -20° to +30° C.
References Cited (Backward Citations)
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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) | 1991-05-17 | 1991-11-16 | 1992-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-17 | 1995-11-16 | 1996-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-17 | 1999-11-16 | 2000-05-17 | $7700.00 | Window Closed / Lapsed |