Patent US2526913A successfully refreshed from Google Patents.
US2526913A
Expired / Lapsed
US
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Hydrogenation of nitroxylene to produce xylidine
Assignee: Honeywell International Inc
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Filing: 1946-07-12
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Granted: 1950-10-24
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Expires: 1966-07-12
Abstract
No abstract record available.
Inventors
- 👤 Wilber O Teeters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:07
CPC Classifications
C; C07; C07C; C07C209/00; C07C209/30; C07C209/32; C07C209/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
A VAPOR PHASE PROCESS FOR HYDROGENATION OF CRUDE MONONITROXYLENE TO XYLIDINE WHICH COMPRISES SUBJECTING SAID CRUDE TO VACUUM DISTILLATION UNDER A PRESSURE BELOW 200 MM. MERCURY MAINTAINED AT THE TOP OF THE FRACTIONING COLUMN TO DRIVE OFF A PURIFIED MONONITROXYLENE CONTAINING NOT MORE THAN 2% POLYNITROXYLENES, NOT MORE THAN .1% ALKALI-SOLUBLE MATERIALS IN THE VAPOR PHASE, CONDENSING SAID VAPORS, AND NOT MORE THAN .1% TARRY RESIDUE MATERIALS, PASSING THE THUS PURIFIED NITROXYLENE CONDENSATE IN CONTACT WITH HYDROGEN TO REVAPORIZE IT AND PRODUCE A GASEOUS MIXTURE OF HYDROGEN AND NITROXYLENE VAPOR AND PASSING SUCH GASEOUS MIXTURE OVER A HYDROGENATION CATALYST.
Claim 2
Dependent Claim
99 words
A VAPOR PHASE PROCESS FOR HYDROGENATION OF CRUDE MONONITROXYLENE TO XYLIDINE WHICH COMPRISES SUBJECTING SAID CRUDE TO VACUUM DISTILLATION UNDER A PRESSURE BELOW 200 MM. MERCURY MAINTAINED AT THE TOP OF THE FRACTIONING COLUMN TO DRIVE OFF A PURIFIED MONONITROXYLENE CONTAINING NOT MORE THAN 2% POLYNITROXYLENES, NOT MORE THAN .1% ALKALI-SOLUBLE MATERIALS IN THE VAPOR PHASE, CONDENSING SAID VAPORS, AND NOT MORE THAN .1% TARRY RESIDUE MATERIALS, PASSING THE THUS PURIFIED NITROXYLENE CONDENSATE IN CONTACT WITH HYDROGEN TO REVAPORIZE IT AND PRODUCE A GASEOUS MIXTURE OF HYDROGEN AND NITROXYLENE VAPOR AND PASSING SUCH GASEOUS MIXTURE OVER A HYDROGENATION CATALYST.
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) | 1953-10-23 | 1954-04-24 | 1954-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-23 | 1958-04-24 | 1958-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-23 | 1962-04-24 | 1962-10-24 | $7700.00 | Window Closed / Lapsed |