US2829153A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous ester interchange process
Assignee: EIDP Inc
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Filing: 1957-03-04
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Granted: 1958-04-01
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Expires: 1977-03-04
Abstract
No abstract record available.
Inventors
- 👤 Joseph L Vodonik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:18
CPC Classifications
C; C07; C07C; C07C69/00; C07C69/76; C07C69/80; C07C69/82; C07C67/00; C07C67/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
177 words
IN A CONTINUOUS PROCESS FOR REACTING A DIHYDRIC ALCOHOL STARTING MATERIAL COMPRISING AT LEAST ONE RELATIVELY HIGHER-BOILING DIHYDRIC ALCOHOL WITH AN ESTER STARTING MATERIAL COMPRISING AT LEAST ONE ESTER OF A LOWER-BOILING ALCOHOL AND A DICARBOXYLIC ACID TO FORM AN ESTER PRODUCT COMPRISING AT LEAST ONE ESTER OF A DIHYDRIC ALCOHOL AND A DICARBOXYLIC ACID, THE IMPROVEMENT WHICH COMPRISES SUBSTANTIALLY COMPLETING THE REACTION BY FEEDING IN PROPORTION FROM 1.3 TO 3.5 MOLS OF SAID DIHYDRIC ALCOHOL STARTING MATERIAL AND 1 MOL OF SAID ESTER STARTING MATERIAL TO A REACTION ZONE CONTAINING A TRANSESTERIFICATION CATALYST, WITHDRAWING SAID ESTER PRODUCT SO FORMED AT ABOUT THE SAME MOLAR RATE AS SAID ESTER STARTING MATERIAL IS ADDED, REMOVING BY DISTILLATION THE VOLATILE ALCOHOL AS IT IS FORMED AND AFTER EQUILIBRIUM IS SET UP MAINTAINING AT LEAST ONE DIHYDRIC ALCOHOL UNDER REFLUX SO THAT IN THE REACTION ZONE THE TOTAL NUBER OF MOLS OF FREE DIHYDRIC ALCOHOL IS MAINTAINED AT A SUBSTANTIALLY CONSTANT RATIO IN THE RANGE OF FROM 3 TO 30 TIMES THE TOTAL NUMBER OF MOLS OF DICARBOXYLIC RADICALS PRESENT.
Claim 2
Dependent Claim
177 words
IN A CONTINUOUS PROCESS FOR REACTING A DIHYDRIC ALCOHOL STARTING MATERIAL COMPRISING AT LEAST ONE RELATIVELY HIGHER-BOILING DIHYDRIC ALCOHOL WITH AN ESTER STARTING MATERIAL COMPRISING AT LEAST ONE ESTER OF A LOWER-BOILING ALCOHOL AND A DICARBOXYLIC ACID TO FORM AN ESTER PRODUCT COMPRISING AT LEAST ONE ESTER OF A DIHYDRIC ALCOHOL AND A DICARBOXYLIC ACID, THE IMPROVEMENT WHICH COMPRISES SUBSTANTIALLY COMPLETING THE REACTION BY FEEDING IN PROPORTION FROM 1.3 TO 3.5 MOLS OF SAID DIHYDRIC ALCOHOL STARTING MATERIAL AND 1 MOL OF SAID ESTER STARTING MATERIAL TO A REACTION ZONE CONTAINING A TRANSESTERIFICATION CATALYST, WITHDRAWING SAID ESTER PRODUCT SO FORMED AT ABOUT THE SAME MOLAR RATE AS SAID ESTER STARTING MATERIAL IS ADDED, REMOVING BY DISTILLATION THE VOLATILE ALCOHOL AS IT IS FORMED AND AFTER EQUILIBRIUM IS SET UP MAINTAINING AT LEAST ONE DIHYDRIC ALCOHOL UNDER REFLUX SO THAT IN THE REACTION ZONE THE TOTAL NUBER OF MOLS OF FREE DIHYDRIC ALCOHOL IS MAINTAINED AT A SUBSTANTIALLY CONSTANT RATIO IN THE RANGE OF FROM 3 TO 30 TIMES THE TOTAL NUMBER OF MOLS OF DICARBOXYLIC RADICALS PRESENT.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-31 | 1961-09-30 | 1962-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-31 | 1965-09-30 | 1966-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-31 | 1969-09-30 | 1970-04-01 | $7700.00 | Window Closed / Lapsed |