US4339596A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of byproduct stream from adipic acid manufacture
Assignee: El Paso Products Co
•
Filing: 1979-11-15
•
Granted: 1982-07-13
•
Expires: 1999-11-15
Abstract
Abstract In one embodiment, this invention provides a process for converting a dilute aqueous filtrate byproduct stream from adipic acid manufacture into a concentrated methanolic solution which does not solidify at ambient temperatures. In another embodiment, this invention provides an improved process for the separation and recovery of byproducts associated with the isolation of C4-C6 dicarboxylic acids contained in a waste byproduct stream derived from an adipic acid manufacturing operation involving nitric acid oxidation of a cyclohexanone/cyclohexanol feedstream in the presence of a catalyst.
Inventors
- 👤 Freylon B. Coffey
- 👤 Norbert F. Cywinski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:44
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/42; C07C51/487; C07C51/493; C02; C02F; C02F1/00; C02F1/02; C02F1/04; C02F1/048; C02F1/26; C02F2103/00; C02F2103/34; C02F2103/36
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
123 words
A method of facilitating the storage and transport of an aqueous filtrate waste byproduct stream derived from a process for producing adipic acid by nitric acid oxidation of cyclohexanone/cyclohexanol, which method comprises the steps of (1) reducing the volume of the aqueous filtrate medium by the removal of water and volatile components which co-distill with water to provide a concentrate solution which has a water content between about 5-30 weight percent and a nitric acid content between 1-6 weight percent, based on total solution weight; and (2) admixing the concentrate solution with between about 5-20 weight percent methanol, based on total solution weight, to form a single phase homogeneous solution; wherein the said homogeneous solution has a freezing point below about 5° C.
Claim 2
Independent Claim
123 words
A method of facilitating the storage and transport of an aqueous filtrate waste byproduct stream derived from a process for producing adipic acid by nitric acid oxidation of cyclohexanone/cyclohexanol, which method comprises the steps of (1) reducing the volume of the aqueous filtrate medium by the removal of water and volatile components which co-distill with water to provide a concentrate solution which has a water content between about 5-30 weight percent and a nitric acid content between 1-6 weight percent, based on total solution weight; and (2) admixing the concentrate solution with between about 5-20 weight percent methanol, based on total solution weight, to form a single phase homogeneous solution; wherein the said homogeneous solution has a freezing point below about 5° C.
Claim 3
Independent Claim
166 words
A method of facilitating the storage and transport of an aqueous filtrate byproduct stream derived from a process for producing adipic acid by nitric acid oxidation of cyclohexanone/cyclohexanol, which method comprises the steps of (1) reducing the volume of the aqueous filtrate medium by the removal of water and volatile components which co-distill with water to provide a concentrate solution which has a water content between about 5-30 weight percent and a nitric acid content between about 1-6 weight percent, based on total solution weight; (2) admixing the concentrate solution with between about 5-20 weight percent methanol, based on total solution weight; and (3) heating the admixture at a temperature in the range between about 35°-60° C. for a period of time between about 5-45 minutes sufficient to form a single phase homogeneous solution and to effect partial esterification of the C 4 -C 6 carboxylic acid components contained in the homogeneous solution; wherein the said homogeneous solution has a freezing point below about 0° C.
Claim 4
Independent Claim
166 words
A method of facilitating the storage and transport of an aqueous filtrate byproduct stream derived from a process for producing adipic acid by nitric acid oxidation of cyclohexanone/cyclohexanol, which method comprises the steps of (1) reducing the volume of the aqueous filtrate medium by the removal of water and volatile components which co-distill with water to provide a concentrate solution which has a water content between about 5-30 weight percent and a nitric acid content between about 1-6 weight percent, based on total solution weight; (2) admixing the concentrate solution with between about 5-20 weight percent methanol, based on total solution weight; and (3) heating the admixture at a temperature in the range between about 35°-60° C. for a period of time between about 5-45 minutes sufficient to form a single phase homogeneous solution and to effect partial esterification of the C 4 -C 6 carboxylic acid components contained in the homogeneous solution; wherein the said homogeneous solution has a freezing point below about 0° C.
Claim 5
Dependent Claim
34 words
A method in accordance with claim 2 wherein the step (2) concentrate solution contains between about 50-70 weight percent, based on solution weight, of a mixture of succinic acid, glutaric acid and adipic acid.
References Cited (Backward Citations)
US2824122A
Cited
US4076948A
Cited
US4082788A
Cited
US3810937A
Cited
US4105856A
Cited
US3726888A
Cited
US3886199A
Cited
US4052441A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-07-12 | 1986-01-11 | 1986-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-12 | 1990-01-11 | 1990-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-12 | 1994-01-11 | 1994-07-13 | $7700.00 | Window Closed / Lapsed |