US2795538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fractional distillation of coal tar
Assignee: Rain Carbon Germany GmbH
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Filing: 1954-05-26
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Granted: 1957-06-11
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Expires: 1974-05-26
Abstract
No abstract record available.
Inventors
- 👤 Ratte Heinrich
- 👤 Geller Julius
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:01
CPC Classifications
C; C10; C10C; C10C1/00; C10C1/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
170 words
A METHOD OF CONTINUOUS FRACTIONAL DISTILLATION OF COAL TAR, COMPRISING THE FOLLOWING STEPS; (A) SEPARATING COAL TAR BY CONTINUOUS FRACTIONAL DISTILLATION INTO LOWBOILING INGREDIENTS AND A DISTILLATION RESIDUE SUBSTANTIALLY FREE FROM LOW-BOILING INGREDIENTS UP TO DIPHENYLENE OXIDE TO 350*-380*C. AND EVAPORATING THEREFROM UNDER VACUUM IN THE RANGE OF 40-80MM. HIGH-BOILING INGREDIENTS AT LEAST UP TO PHENANTHRENE, ANTHRACENE AND CARBAZOL, SUBJECTING THE RESULTING VAPORS TO CONTINUOUS RECTIFICATION UNDER VACUUM IN THE RANGE OF 20-40MM., AND CONTINUOUSLY DISCHARGING A VAPOR FRACTION CONTAINING AT LEAST PHENANTHRENE, ANTHRACENE AND CARBAZOL, AND CONTINUOUSLY DISCHARGING THE DISTILLATION RESIDUE IN A SECOND FRACTIONATION; CONDENSING SAID VAPOR FRACTION AND SUBJECTING IT TO CONTINUOUS RECTIFICATION WITH HIGH SUPPLY OF HEAT FOR 2-4 FOLD EVAPORATION OF THE PRODUCTS AND HIGH REFLUX EQUAL TO 1-3 TIMES THE PRODUCTS TO BE RECOVERED UNDER VACCUM IN THE RANGE OF 100-200 MM. IN ORDER TO SEPARATE IT AT LEAST INTO A RESIDUE OF CONCENTRATED CARBAZOL SUBSTANTIALLY FREE FROM PHENANTHRENE AND ANTHRACENE AND A FRACTION OF ANTHRACENE+PHENANTHRENE SUBSTANTIALLY FREE FROM CARBAZOL IN A THIRD FRACTIONATION.
Claim 2
Independent Claim
170 words
A METHOD OF CONTINUOUS FRACTIONAL DISTILLATION OF COAL TAR, COMPRISING THE FOLLOWING STEPS; (A) SEPARATING COAL TAR BY CONTINUOUS FRACTIONAL DISTILLATION INTO LOWBOILING INGREDIENTS AND A DISTILLATION RESIDUE SUBSTANTIALLY FREE FROM LOW-BOILING INGREDIENTS UP TO DIPHENYLENE OXIDE TO 350*-380*C. AND EVAPORATING THEREFROM UNDER VACUUM IN THE RANGE OF 40-80MM. HIGH-BOILING INGREDIENTS AT LEAST UP TO PHENANTHRENE, ANTHRACENE AND CARBAZOL, SUBJECTING THE RESULTING VAPORS TO CONTINUOUS RECTIFICATION UNDER VACUUM IN THE RANGE OF 20-40MM., AND CONTINUOUSLY DISCHARGING A VAPOR FRACTION CONTAINING AT LEAST PHENANTHRENE, ANTHRACENE AND CARBAZOL, AND CONTINUOUSLY DISCHARGING THE DISTILLATION RESIDUE IN A SECOND FRACTIONATION; CONDENSING SAID VAPOR FRACTION AND SUBJECTING IT TO CONTINUOUS RECTIFICATION WITH HIGH SUPPLY OF HEAT FOR 2-4 FOLD EVAPORATION OF THE PRODUCTS AND HIGH REFLUX EQUAL TO 1-3 TIMES THE PRODUCTS TO BE RECOVERED UNDER VACCUM IN THE RANGE OF 100-200 MM. IN ORDER TO SEPARATE IT AT LEAST INTO A RESIDUE OF CONCENTRATED CARBAZOL SUBSTANTIALLY FREE FROM PHENANTHRENE AND ANTHRACENE AND A FRACTION OF ANTHRACENE+PHENANTHRENE SUBSTANTIALLY FREE FROM CARBAZOL IN A THIRD FRACTIONATION.
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) | 1960-06-10 | 1960-12-10 | 1961-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-06-10 | 1964-12-10 | 1965-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-06-10 | 1968-12-10 | 1969-06-11 | $7700.00 | Window Closed / Lapsed |