Patent US2782148A successfully refreshed from Google Patents.
US2782148A
Expired / Lapsed
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Process for the purification of acrylic acid nitrile
Assignee: BASF Schweiz AG
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Filing: 1951-12-04
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Granted: 1957-02-19
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Expires: 1971-12-04
Abstract
No abstract record available.
Inventors
- 👤 Geiger Max
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:10
CPC Classifications
C; C07; C07C; C07C253/00; C07C253/32; C07C253/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
146 words
IN THE PROCESS OF PURIFICATION OF ACRYIC ACID NITRILE BY REMOVING DIVINYLACETYLENE WHICH IS PERFORMED BY THE USE OF A GASEOUS MIXTURE CONTAINING AT LEAST ACRYLI ACID NITRILE AND DIVINYLACETYLENE IN DILUTE FORM AS STARTING MATERIAL AND IS CONDUCTED IN A CONTINUOUS MANNER, THE STEPS WHICH COMPRISES INTRODUCING THE GASEOUS MIXTURE WHICH IS DERIVED FROM THE REACTION TOWER USED FOR THE SYNTHESIS OF ACRYLIC ACID NITRILE AND CONTAINS AT LEAST ACRYLONITRILE AND DIVINYLACETYLENE INTO THE UPPER PART OF A HEATED DISTILLATION COLUMN, THE LOWER PART OF WHICH IS CHARGED WITH A DILUTE SOLUTION OF ACRYLIC ACID NITRILE THROUGHOUT THE WHOLE PROCESS, CAUSING TO FLOW WATER THROUGH AN EXTRACTION COLUMN PLACED ON THE TOP OF SAID DISTILLATION COLUMN IN COUNTERCURRENT TO THE GASEOUS MIXTURE IN ORDER TO EXTRACT ACRYLIC ACID NITRILE THEREFROM, AND HEATING THE SAID DILUTE SOLUTION OF ACRYLIC ACID NITRILE IN THE LOWER PART OF
Claim 2
Dependent Claim
146 words
IN THE PROCESS OF PURIFICATION OF ACRYIC ACID NITRILE BY REMOVING DIVINYLACETYLENE WHICH IS PERFORMED BY THE USE OF A GASEOUS MIXTURE CONTAINING AT LEAST ACRYLI ACID NITRILE AND DIVINYLACETYLENE IN DILUTE FORM AS STARTING MATERIAL AND IS CONDUCTED IN A CONTINUOUS MANNER, THE STEPS WHICH COMPRISES INTRODUCING THE GASEOUS MIXTURE WHICH IS DERIVED FROM THE REACTION TOWER USED FOR THE SYNTHESIS OF ACRYLIC ACID NITRILE AND CONTAINS AT LEAST ACRYLONITRILE AND DIVINYLACETYLENE INTO THE UPPER PART OF A HEATED DISTILLATION COLUMN, THE LOWER PART OF WHICH IS CHARGED WITH A DILUTE SOLUTION OF ACRYLIC ACID NITRILE THROUGHOUT THE WHOLE PROCESS, CAUSING TO FLOW WATER THROUGH AN EXTRACTION COLUMN PLACED ON THE TOP OF SAID DISTILLATION COLUMN IN COUNTERCURRENT TO THE GASEOUS MIXTURE IN ORDER TO EXTRACT ACRYLIC ACID NITRILE THEREFROM, AND HEATING THE SAID DILUTE SOLUTION OF ACRYLIC ACID NITRILE IN THE LOWER PART OF
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) | 1960-02-19 | 1960-08-20 | 1961-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-19 | 1964-08-20 | 1965-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-19 | 1968-08-20 | 1969-02-19 | $7700.00 | Window Closed / Lapsed |