Patent US3869377A successfully refreshed from Google Patents.
US3869377A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of extrapure aromatics
Assignee: GEA Group AG
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Filing: 1972-12-13
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Granted: 1975-03-04
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Expires: 1992-12-13
Abstract
Abstract In a process for producing substantially pure aromatics wherein a gaseous reaction mixture which contains hydrogen, olefins, diolefins and aromatic compounds is subjected to a hydroforming operation, and wherein subsequently the aromatics are separated in the substantially pure state from the hydroformate, the improvement which comprises cooling the hydroformate to a temperature of 100 to 400*C directly after hydroforming and passing it still in gaseous state through a reactor filled with a hydrogenation catalyst under a pressure which differs from that under which the hydroforming operation was performed by not more than 10 atmospheres, whereby the olefins and diolefins are substantially eliminated.
Inventors
- 👤 Karl-Heinz Eisenlohr
- 👤 Helmut Markwort
- 👤 Berthold Scholz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:24
CPC Classifications
C; C10; C10G; C10G69/00; C10G69/02; C10G69/08
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
119 words
IN A PROCESS FOR PRODUCING SUBSTANTIALLY PURE AROMATICS WHEREIN A GASEOUS REACTION MIXTURE WHICH CONTAINS HYDROGEN, OLEFINS, DIOLEFINS AND AROMATIC COMPOUNDS IS SUBJECTED TO A HYDROFORMING OPERATION WITH A NOBLE METAL CATALYST AT ABOUT 500* TO 600*C AND A PRESSURE OF ABOUT 15 TO 50 ATMOSPHERES, AND WHEREIN SUBSEQUENTLY THE AROMATICS ARE SEPARATED IN THE SUBSTANTIALLY PURE STATE FROM THE HYDROFORMATE, THE IMPROVEMENT WHICH COMPRISES COOLING THE HYDROFORMATE TO A TEMPERATURE OF 100 TO 400*C DIRECTLY AFTER HYDROFORMING AND PASSING IT STILL IN GASEOUS STATE THROUGH A REACTOR FILLED WITH A HYDROGE NATION CATALYST COMPRISING COBALT AND MOLYBEDUNUM ON AN INORGANIC OXIDE CARRIER UNDER A LOWER PRESSURE THAN THE HYDROFORMING OPERATION, WHEREBY THE OLEFINS AND DIOLEFINS AND SUBSTANTIALLY ELIMINATED.
Claim 2
Dependent Claim
119 words
IN A PROCESS FOR PRODUCING SUBSTANTIALLY PURE AROMATICS WHEREIN A GASEOUS REACTION MIXTURE WHICH CONTAINS HYDROGEN, OLEFINS, DIOLEFINS AND AROMATIC COMPOUNDS IS SUBJECTED TO A HYDROFORMING OPERATION WITH A NOBLE METAL CATALYST AT ABOUT 500* TO 600*C AND A PRESSURE OF ABOUT 15 TO 50 ATMOSPHERES, AND WHEREIN SUBSEQUENTLY THE AROMATICS ARE SEPARATED IN THE SUBSTANTIALLY PURE STATE FROM THE HYDROFORMATE, THE IMPROVEMENT WHICH COMPRISES COOLING THE HYDROFORMATE TO A TEMPERATURE OF 100 TO 400*C DIRECTLY AFTER HYDROFORMING AND PASSING IT STILL IN GASEOUS STATE THROUGH A REACTOR FILLED WITH A HYDROGE NATION CATALYST COMPRISING COBALT AND MOLYBEDUNUM ON AN INORGANIC OXIDE CARRIER UNDER A LOWER PRESSURE THAN THE HYDROFORMING OPERATION, WHEREBY THE OLEFINS AND DIOLEFINS AND SUBSTANTIALLY ELIMINATED.
Claim 3
Dependent Claim
28 words
A process as claimed in claim 1, wherein the hydrogenation catalyst is one or more oxides of metals of the 6th and/or 8th Group of the Periodic System.
Claim 4
Dependent Claim
25 words
A process as claimed in claim 1, wherein the hydrogenation catalyst contains 4 percent by weight cobalt oxide and 10 percent by weight molybdenum oxide.
Claim 5
Dependent Claim
19 words
A process as claimed in claim 1, wherein the hydrogenation catalyst is supported on a carrier containing aluminum oxide.
Claim 6
Dependent Claim
28 words
A process as claimed in claim 1, wherein the space velocity through the hydrogenation catalyst is 1 to 8 kg. of hydroformate per liter of catalyst per hour.
Claim 7
Dependent Claim
28 words
A process as claimed in claim 1, wherein the space velocity through the hydrogenation catalyst is 3 to 6 kg. of hydroformate per liter of catalyst per hour.
Claim 8
Dependent Claim
27 words
A process as claimed in claim 1, wherein the pressure over the hydrogenation catalyst is the same pressure as that under which the hydroforming operation was performed.
Claim 9
Dependent Claim
19 words
A process as claimed in claim 1, wherein the aromatic compounds are separated from the hydrogenated hydroformate by extraction.
Claim 10
Dependent Claim
20 words
A process as claimed in claim 1, wherein the aromatic compounds are separated from the hydrogenated hydroformate by extractive distillation.
Claim 11
Dependent Claim
20 words
A process as claimed in claim 1, wherein the aromatic compounds are separated from the hydrogenated hydroformate by molecular sieves.
Claim 12
Dependent Claim
21 words
A process as claimed in claim 1, wherein the aromatic compounds are separated from the hydrogenated hydroformate by distillation and crystallisation.
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) | 1978-03-03 | 1978-09-02 | 1979-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-03 | 1982-09-02 | 1983-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-03 | 1986-09-02 | 1987-03-04 | $7700.00 | Window Closed / Lapsed |