US2790836A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous production of pentaerythritol
Assignee: Celanese Corp
•
Filing: 1953-05-21
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Granted: 1957-04-30
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Expires: 1973-05-21
Abstract
No abstract record available.
Inventors
- 👤 Robert L Mitchell
- 👤 Ralph M Pritchett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:33
CPC Classifications
C; C07; C07C; C07C31/00; C07C31/18; C07C31/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
PROCESS FOR THE CONTINUOUS PRODUCTION OF PENTAERYTH RITOL WHICH COMPRISES CONTINUOUSLY MIXING TOGETHER ACETALDEHYDE, 8 TO 15 MOLES OF FORMALDEHYDE PER MOLE OF ACETALDEHYDE, WATER AND SODIUM HYDROXIDE RAPIDLY AND WITH AGITATION TO CAUSE SAID ALDEHYDES AND SODIUM HYDROXIDE TO REACT AT A TEMPERATURE OF 115 TO 160*F., THEN CONTINUOSULY NEUTRALIZING THE REACTION MIXTURE BY ADDING AN ACIDIC MATERIAL THERETO, CONTINUOUSLY DISTILLING UNREACTED FORMALDEHYDE FROM SAID NEUTRALIZED MIXTURE, AND RECOVERING PENTACRYTHRITOL FROM THE RESIDUE OF SAID DISTILLATION.
Claim 2
Dependent Claim
77 words
PROCESS FOR THE CONTINUOUS PRODUCTION OF PENTAERYTH RITOL WHICH COMPRISES CONTINUOUSLY MIXING TOGETHER ACETALDEHYDE, 8 TO 15 MOLES OF FORMALDEHYDE PER MOLE OF ACETALDEHYDE, WATER AND SODIUM HYDROXIDE RAPIDLY AND WITH AGITATION TO CAUSE SAID ALDEHYDES AND SODIUM HYDROXIDE TO REACT AT A TEMPERATURE OF 115 TO 160*F., THEN CONTINUOSULY NEUTRALIZING THE REACTION MIXTURE BY ADDING AN ACIDIC MATERIAL THERETO, CONTINUOUSLY DISTILLING UNREACTED FORMALDEHYDE FROM SAID NEUTRALIZED MIXTURE, AND RECOVERING PENTACRYTHRITOL FROM THE RESIDUE OF SAID DISTILLATION.
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) | 1960-04-29 | 1960-10-29 | 1961-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-29 | 1964-10-29 | 1965-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-29 | 1968-10-29 | 1969-04-30 | $7700.00 | Window Closed / Lapsed |