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US4661614A
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US
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Process for the preparation of iminodiacetonitrile
Assignee: Monsanto Technology LLC
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Filing: 1986-03-06
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Granted: 1987-04-28
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Expires: 2006-03-06
Abstract
Abstract A process for preparing iminodiacetonitrile which comprises bringing together under reaction conditions formaldehyde, hydrogen cyanide and a source of ammonia under substantially stoichiometric conditions at a temperature between about 30° and about 65° C. at a pH between about 1.5 and about 5.5, preferably between about 3.5 and about 5.3, to produce the desired iminodiacetonitrile.
Inventors
- 👤 James T. Most
- 👤 Thomas J. Richard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:37
CPC Classifications
C; C07; C07C; C07C255/00; C07C255/01; C07C255/24
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
71 words
A process for preparing iminodiacetonitrile which comprises bringing together simultaneously under reaction conditions formaldehyde, hydrogen cyanide and a source of ammonia, a. the mole ratio of formaldehyde to hydrogen cyanide being about 0.8 to 1.2, b. the mole ratio of ammonia to hydrogen cyanide being about 0.4 to 0.6, c. at a pH between about 1.5 and about 5.3, d. at a temperature between about 30° C. and about 65° C.
Claim 2
Dependent Claim
71 words
A process for preparing iminodiacetonitrile which comprises bringing together simultaneously under reaction conditions formaldehyde, hydrogen cyanide and a source of ammonia, a. the mole ratio of formaldehyde to hydrogen cyanide being about 0.8 to 1.2, b. the mole ratio of ammonia to hydrogen cyanide being about 0.4 to 0.6, c. at a pH between about 1.5 and about 5.3, d. at a temperature between about 30° C. and about 65° C.
Claim 3
Dependent Claim
25 words
A process as set forth in claim 1 wherein the formaldehyde, hydrogen cyanide and the source of ammonia are brought together in substantially stoichiometric amounts.
Claim 4
Dependent Claim
16 words
A process of claim 1 wherein the pH is maintained between about 3.5 and about 5.3.
Claim 5
Dependent Claim
18 words
A process of claim 1 wherein the temperature is maintained between about 40° C. and about 55° C.
Claim 6
Dependent Claim
13 words
A process of claim 3 wherein the ammonia source is an ammonium salt.
References Cited (Backward Citations)
US2794044A
Cited
US3904668A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-04-27 | 1990-10-27 | 1991-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-27 | 1994-10-27 | 1995-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-27 | 1998-10-27 | 1999-04-28 | $7700.00 | Window Closed / Lapsed |