US3911003A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of glycolic acid and oxydiacetic acid
Assignee: Chevron USA Inc
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Filing: 1974-06-19
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Granted: 1975-10-07
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Expires: 1994-06-19
Abstract
Abstract A process for producing hydroxyacetic acid which comprises contacting carbon monoxide with formaldehyde and a catalyst consisting essentially of hydrogen fluoride in a reaction zone at a temperature between 0* and 100*C and a pressure between 10 and 4000 psig. Oxydiacetic acid is also produced by this reaction. The ratio of hydroxyacetic acid to oxydiacetic acid is increased by adding water to the reaction mixture.
Inventors
- 👤 Shigeto Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:28
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/10; C07C51/12
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
52 words
A PROCESS FOR PRODUCING HYDROXYACETIC ACID WHICH COMPRISES CONTCTING CARBON MONXIDE WITH FORMALDEHYDE AND A CATALYST COSISTING ESSENTIALLY OF HYDROGEN FLUORIDE IN A REACTION ZONE AND UNDER REACTION CONDITIONS EFFECTIVE TO FORM HYDROXYACETIC ACID, INCLUDING A TEMPERATURE BETWEEN 0* AND 100*C. AND A CARBON MONOXIDE PARTIAL PRESSURE BETWEEN 10 AND 4000 PSIG.
Claim 2
Dependent Claim
52 words
A PROCESS FOR PRODUCING HYDROXYACETIC ACID WHICH COMPRISES CONTCTING CARBON MONXIDE WITH FORMALDEHYDE AND A CATALYST COSISTING ESSENTIALLY OF HYDROGEN FLUORIDE IN A REACTION ZONE AND UNDER REACTION CONDITIONS EFFECTIVE TO FORM HYDROXYACETIC ACID, INCLUDING A TEMPERATURE BETWEEN 0* AND 100*C. AND A CARBON MONOXIDE PARTIAL PRESSURE BETWEEN 10 AND 4000 PSIG.
Claim 3
Dependent Claim
20 words
A process in accordance with claim 1 wherein the carbon monoxide is also contacted with water in the reaction zone.
Claim 4
Dependent Claim
26 words
A process in accordance with claim 1 wherein the temperature is between 20* and 60*C and the carbon monoxide partial pressure between 10 and 3,000 psig.
Claim 5
Dependent Claim
53 words
A process in accordance with claim 2 wherein the formaldehyde and water are fed to the reaction zone at a mol percent of 3 to 35 formaldehyde; 3 to 35 water; and 40 to 90 HF; and the carbon monoxide partial pressure is maintained at 10 to 3000 psig in the reaction zone.
Claim 6
Dependent Claim
58 words
A process for producing hydroxyacetic acid and oxydiacetic acid which comprises contacting carbon monoxide with formaldehyde and a catalyst consisting essentially of hydrogen fluoride in a reaction zone and under reaction conditions effective to form hydroxyacetic acid and oxydiacetic acid, including a temperature between 0* and 100*C. and a carbon monoxide partial pressure between 10 and 4000 psig.
Claim 7
Dependent Claim
58 words
A process for producing hydroxyacetic acid and oxydiacetic acid which comprises contacting carbon monoxide with formaldehyde and a catalyst consisting essentially of hydrogen fluoride in a reaction zone and under reaction conditions effective to form hydroxyacetic acid and oxydiacetic acid, including a temperature between 0* and 100*C. and a carbon monoxide partial pressure between 10 and 4000 psig.
Claim 8
Dependent Claim
53 words
A process for producing oxydiacetic acid which comprises contacting carbon monoxide with formaldehyde and a catalyst consisting essentially of hydrogen fluoride and under reaction conditions effective to form oxydiacetic acid, including substantially anhydrous reaction conditions and a temperature between 0* and 100*C. and a carbon monoxide partial pressure between 10 and 4000 psig.
Claim 9
Dependent Claim
53 words
A process for producing oxydiacetic acid which comprises contacting carbon monoxide with formaldehyde and a catalyst consisting essentially of hydrogen fluoride and under reaction conditions effective to form oxydiacetic acid, including substantially anhydrous reaction conditions and a temperature between 0* and 100*C. and a carbon monoxide partial pressure between 10 and 4000 psig.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-06 | 1979-04-07 | 1979-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-06 | 1983-04-07 | 1983-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-06 | 1987-04-07 | 1987-10-07 | $7700.00 | Window Closed / Lapsed |