US2862855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Azeotrope distillation of aromatic isopropyl compounds from phenol
Assignee: Rain Carbon Germany GmbH
•
Filing: 1952-11-19
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Granted: 1958-12-02
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Expires: 1972-11-19
Abstract
No abstract record available.
Inventors
- 👤 Lang Karl Friedrich
- 👤 Schildwachter Heinrich
- 👤 Hupe Adolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:43
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/68; C07C37/70; C07C37/74; C07C37/78; B; B01; B01D; B01D3/00; B01D3/34; B01D3/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
A METHOD OF SEPARATING AN ISOPROPYL COMPOUND CONTAINING AN AROMATIC RADICAL, FROM A PHENOL CAPABLE OF BEING FORMED SAID ISOPROPYL COMPOUND BY OXIDATION AND DECOMPOSITION OF THE OXIDATION PRODUCT, IN WHICH A MIXTURE OF SAID ISOPROPYL COMPOUND AND PHENOL IS SUBJECTED TO CONTINOUS FRACTIONAL DISTILLATION WITH WATER IN A FRACTIONATING COLUMN IN ORDER TO FORM A VAPORIZED AZEOTROPIC MIXTURE SUBSTANTIALLY CONSISTING OF THE ISOPROPYL COMPOUND AND WATER, AND A DISTILLATION RESIDUE CONTAINING THE PHENOL AND BEING FREE FROM THE ISOPROPYL COMPOUND, SAID AZEOTROPIC MIXTURE BEING SUBJECTED TO CONDENSATION AND SEPARATING INTO ISOPROPYL COMPOUND AND WATER, AND THE SEPERATED WATER AND PART OF THE SEPARATED ISOPORPYL COMPOUND BEING CONTINUOUSLY REINTRODUCED INTO THE FRACTIONATING COLUMN, SAID AZEOTROPIC MIXTURE BEING DISTILLED OFF WITH A REFLUX RATIO FOR THE ORGANIC PHASE, OF AT 5:1
Claim 2
Independent Claim
130 words
A METHOD OF SEPARATING AN ISOPROPYL COMPOUND CONTAINING AN AROMATIC RADICAL, FROM A PHENOL CAPABLE OF BEING FORMED SAID ISOPROPYL COMPOUND BY OXIDATION AND DECOMPOSITION OF THE OXIDATION PRODUCT, IN WHICH A MIXTURE OF SAID ISOPROPYL COMPOUND AND PHENOL IS SUBJECTED TO CONTINOUS FRACTIONAL DISTILLATION WITH WATER IN A FRACTIONATING COLUMN IN ORDER TO FORM A VAPORIZED AZEOTROPIC MIXTURE SUBSTANTIALLY CONSISTING OF THE ISOPROPYL COMPOUND AND WATER, AND A DISTILLATION RESIDUE CONTAINING THE PHENOL AND BEING FREE FROM THE ISOPROPYL COMPOUND, SAID AZEOTROPIC MIXTURE BEING SUBJECTED TO CONDENSATION AND SEPARATING INTO ISOPROPYL COMPOUND AND WATER, AND THE SEPERATED WATER AND PART OF THE SEPARATED ISOPORPYL COMPOUND BEING CONTINUOUSLY REINTRODUCED INTO THE FRACTIONATING COLUMN, SAID AZEOTROPIC MIXTURE BEING DISTILLED OFF WITH A REFLUX RATIO FOR THE ORGANIC PHASE, OF AT 5:1
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-01 | 1962-06-02 | 1962-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-01 | 1966-06-02 | 1966-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-01 | 1970-06-02 | 1970-12-02 | $7700.00 | Window Closed / Lapsed |