US3708523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of manufacturing acrylic derivatives
Assignee: Progil SARL
•
Filing: 1971-07-02
•
Granted: 1973-01-02
•
Expires: 1991-07-02
Abstract
Abstract A process for making acrylic derivatives from acrylic acid and lower esters thereof by dehydrochlorination of the corresponding Alpha -chloropropionic acid or ester in the vapor phase with a catalyst in the presence of added gaseous hydrogen chloride.
Inventors
- 👤 J Berthoux
- 👤 G Schneider
- 👤 Surville R De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:00
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/347; C07C51/377
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
28 words
A process according to claim 1 wherein the quantity of added hydrogen chloride is between 0.2 to 2 moles for each mole of Alpha -chloropropionic acid or ester.
Claim 2
Dependent Claim
31 words
A process according to claim 1 wherein the catalyst is used in the anhydrous state and is selected from the group consisting of earth-alkali metal, zinc and magnesium phosphates and sulfates.
Claim 3
Dependent Claim
12 words
A process according to claim 3 wherein the catalyst is calcium sulfate.
Claim 4
Dependent Claim
15 words
A process according to claim 1 wherein the reaction temperature is between 200*C. and 350*C.
Claim 5
Dependent Claim
15 words
A process according to claim 5 wherein the reaction temperature is between 280*C. and 320*C.
Claim 6
Dependent Claim
32 words
A process according to claim 1 wherein the gaseous effluent from the reaction is cooled in order to separate gaseous hydrogen chloride and a liquid phase containing said acrylic acid or ester.
Claim 7
Dependent Claim
25 words
A process according to claim 1 wherein any Beta -chloropropionic acid or ester which has formed during the reaction is recycled to the dehydrochlorinating zone.
References Cited (Backward Citations)
US2087466A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |