US2672435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acrylonitrile purification process by distillation
Assignee: Monsanto Chemicals Ltd
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Filing: 1952-12-04
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Granted: 1954-03-16
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Expires: 1972-12-04
Abstract
No abstract record available.
Inventors
- 👤 Glen H Shoptaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:38
CPC Classifications
C; C07; C07C; C07C253/00; C07C253/32; C07C253/34; Y; Y10; Y10S; Y10S203/00; Y10S203/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
A METHOD OF REFINING CRUDE ACRYLONITRILE CONTAINING ACETALDEHYDE, HYDROGEN CYANIDE, AND LACTONITRILE WHICH COMPRISES FEEDING THE SAID ACRYLONITRILE INTO AN INTERMEDIATE SECTION OF A FRACTIONATING COLUMN, WITHDRAWING HIGH-BOILING IMPURITIES INCLUDING THE UNDISSOCIATED LACTONITRILE FROM THE BOTTOM OF SAID FRACTIONATING COLUMN, REMOVING ACRYLONITRILE, HYDROGEN CYANIDE, AND ACETALDEHYDE OVERHEAD, CONDENSING SAID OVERHEAD STREAM AND INTRODUCING IT IMMEDIATELY INTO AN INTERMEDIATE SECTION OF A SECOND FRACTIONATING COLUMN, WITHDRAWING ACETALDEHYDE AND HYDROGEN CYANIDE VAPORS OVERHEAD, CONDENSING SAID VAPORS AND RETURNING THEM AS REFLUX TO THE TOP OF SAID SECOND FRACTIONATING COLUMN, REMOVING THE LIQUID ACRYLONITRILE AT A POINT IN THE UPPER SECTION OF SAID SECOND FRACTIONATING COLUMN AND RETURNING IT TO THE FIRST FRACTIONATING COLUMN TO PROVIDE REFLUX THEREFOR, AND RECOVERING SUBSTANTIALLY PURE ACRYLONITRILE FROM THE BOTTOM OF SAID SECOND FRACTIONATING COLUMN.
Claim 2
Independent Claim
128 words
A METHOD OF REFINING CRUDE ACRYLONITRILE CONTAINING ACETALDEHYDE, HYDROGEN CYANIDE, AND LACTONITRILE WHICH COMPRISES FEEDING THE SAID ACRYLONITRILE INTO AN INTERMEDIATE SECTION OF A FRACTIONATING COLUMN, WITHDRAWING HIGH-BOILING IMPURITIES INCLUDING THE UNDISSOCIATED LACTONITRILE FROM THE BOTTOM OF SAID FRACTIONATING COLUMN, REMOVING ACRYLONITRILE, HYDROGEN CYANIDE, AND ACETALDEHYDE OVERHEAD, CONDENSING SAID OVERHEAD STREAM AND INTRODUCING IT IMMEDIATELY INTO AN INTERMEDIATE SECTION OF A SECOND FRACTIONATING COLUMN, WITHDRAWING ACETALDEHYDE AND HYDROGEN CYANIDE VAPORS OVERHEAD, CONDENSING SAID VAPORS AND RETURNING THEM AS REFLUX TO THE TOP OF SAID SECOND FRACTIONATING COLUMN, REMOVING THE LIQUID ACRYLONITRILE AT A POINT IN THE UPPER SECTION OF SAID SECOND FRACTIONATING COLUMN AND RETURNING IT TO THE FIRST FRACTIONATING COLUMN TO PROVIDE REFLUX THEREFOR, AND RECOVERING SUBSTANTIALLY PURE ACRYLONITRILE FROM THE BOTTOM OF SAID SECOND FRACTIONATING COLUMN.
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) | 1957-03-15 | 1957-09-14 | 1958-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-15 | 1961-09-14 | 1962-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-15 | 1965-09-14 | 1966-03-16 | $7700.00 | Window Closed / Lapsed |