US2930818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the purification of i
Assignee: —
•
Filing: —
•
Granted: 1960-03-29
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Expires: 1977-03-29
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:26
CPC Classifications
C; C07; C07C; C07C31/00; C07C31/18; C07C31/24; C07C29/00; C07C29/132; C07C29/136; C07C29/14; C07C29/141; C07C29/74; C07C29/76; C07C29/80; C07C29/88; C07C31/22; C07C45/00; C07C45/78; C07C45/80; C07C45/81; C07C45/82; C07C45/85; C07C47/00; C07C47/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
A PROCESS FOR THE PURIFICATION OF CRUDE 1,1,1-TRIMETHYLOL PROPANE OBTAINED BY CONDENSATION OF BUTYRALDEHYDE WITH FORMALDEHYDE IN AN AQUEOUS MEDIUM IN THE PRESENCE OF CALCIUM HYDROXIDE, ACIDIFICATION OF THE REACTION MIXTURE WITH FORMIC ACID, CONCENTRATION OF THE ACIDIFIED REACTION MIXTURE AND SEPARATION OF THE SALT THUS FORMED WHICH COMPRISES ADDING AN ALKALI METAL HYDROXIDE SOLUTION TO THE CRUDE PRODUCT TO PROVIDE A PH VALUE OF 6.0 TO 7.5, THEN HEATING IT TO A TEMPERATURE OF 50 TO 250* C., THEREAFTER ADJUSTING THE PH THEREOF TO 4.0-5.0 WITH A SUBSTANTIALLY NON-VOLATILE INORGANIC ACID AND SUBJECTING THE MIXTURE TO VACUUM THIN FILM DISTILLATION.
Claim 2
Dependent Claim
101 words
A PROCESS FOR THE PURIFICATION OF CRUDE 1,1,1-TRIMETHYLOL PROPANE OBTAINED BY CONDENSATION OF BUTYRALDEHYDE WITH FORMALDEHYDE IN AN AQUEOUS MEDIUM IN THE PRESENCE OF CALCIUM HYDROXIDE, ACIDIFICATION OF THE REACTION MIXTURE WITH FORMIC ACID, CONCENTRATION OF THE ACIDIFIED REACTION MIXTURE AND SEPARATION OF THE SALT THUS FORMED WHICH COMPRISES ADDING AN ALKALI METAL HYDROXIDE SOLUTION TO THE CRUDE PRODUCT TO PROVIDE A PH VALUE OF 6.0 TO 7.5, THEN HEATING IT TO A TEMPERATURE OF 50 TO 250* C., THEREAFTER ADJUSTING THE PH THEREOF TO 4.0-5.0 WITH A SUBSTANTIALLY NON-VOLATILE INORGANIC ACID AND SUBJECTING THE MIXTURE TO VACUUM THIN FILM DISTILLATION.
References Cited (Backward Citations)
GB709576A
Cited
FR1107899A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-29 | 1963-09-28 | 1964-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-29 | 1967-09-28 | 1968-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-29 | 1971-09-28 | 1972-03-29 | $7700.00 | Window Closed / Lapsed |