US3883566A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification and hydrogenation of furan concentrates
Assignee: Phillips Petroleum Co
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Filing: 1972-09-06
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Granted: 1975-05-13
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Expires: 1992-09-06
Abstract
Abstract Furan concentrates containing deleterious unsaturated contaminants including sulfur compounds are purified prior to hydrogenation by contacting with zinc oxide either prior to or subsequent to separation of high boiling materials from the concentrate with the result that the furan concentrate is hydrogenated to high purity product comprising either furan and saturated materials or tetrahydrofuran and saturated materials with extended hydrogenation catalyst life. In a preferred embodiment, the furan concentrate is obtained as the by-product stream from hydrocarbon oxidative dehydrogenation processes and is subjected to distillation to remove therefrom materials boiling above about 80*C prior to contacting with zinc oxide and hydrogenation.
Inventors
- 👤 Marvin M Johnson
- 👤 Donald C Tabler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:55
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/02; C07D307/34; C07D307/36; Y; Y10; Y10S; Y10S585/00; Y10S585/8995; Y10S585/906
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
123 words
A PROCESS FOR EXTENDING THE LIFE OF HYDROGENATION CATALYLYSTS AND IMPROVING THE HYHYDROGENATABILITY OF FURAN CONCENTRATES TO PRODUCE HIGH PURITY TETRAHYDROFURAN PRODUCTS WHICH COMPRISES CONTACTING A FURAN CONCENTRATE CONTAINING DELETERIOUS UNSATURATED HYDROCARBON CONTAMINANTS AND SULFUR COMPOUNDS, BUT WHICH IS SUBSTANTIALLY FREE OF HIGH BOILING MATERIALS, PRIOR TO HYDROGENATION, WITH ZINC OXIDE AT A TEMPERATURE RANGING FROM ABOUT 550 TO ABOUT 850*F FOR A FINITE PEROID OF TIME SUFFICIENT TO RENDER INNOCUOUS COMPOUNDS PRESENT IN SAID CONCENTRATE WHICH TEND TO INACTIVATE HYDROGENATION CATALYSTS, AND HYDROGENATING SAID CONCENTRATE SUBSTANTIALLY FREE OF CATALYST INACTIVATING MATERIALS BY CONTACTING WITH A HYDROGENATION CATALYST AND HYDROGEN UNDER HYDROGENATION CONDITIONS SUFFICIENT TO HYDROGENATE SAID UNSATURATED HYDROCARBONS TO PARAFFINIC MATERIALS AND CONVERT SAID CONCENTRATE SUBSTANTIALLY TO A HIGH PURITY TETRAHYDROFURAN PRODUCT.
Claim 2
Dependent Claim
123 words
A PROCESS FOR EXTENDING THE LIFE OF HYDROGENATION CATALYLYSTS AND IMPROVING THE HYHYDROGENATABILITY OF FURAN CONCENTRATES TO PRODUCE HIGH PURITY TETRAHYDROFURAN PRODUCTS WHICH COMPRISES CONTACTING A FURAN CONCENTRATE CONTAINING DELETERIOUS UNSATURATED HYDROCARBON CONTAMINANTS AND SULFUR COMPOUNDS, BUT WHICH IS SUBSTANTIALLY FREE OF HIGH BOILING MATERIALS, PRIOR TO HYDROGENATION, WITH ZINC OXIDE AT A TEMPERATURE RANGING FROM ABOUT 550 TO ABOUT 850*F FOR A FINITE PEROID OF TIME SUFFICIENT TO RENDER INNOCUOUS COMPOUNDS PRESENT IN SAID CONCENTRATE WHICH TEND TO INACTIVATE HYDROGENATION CATALYSTS, AND HYDROGENATING SAID CONCENTRATE SUBSTANTIALLY FREE OF CATALYST INACTIVATING MATERIALS BY CONTACTING WITH A HYDROGENATION CATALYST AND HYDROGEN UNDER HYDROGENATION CONDITIONS SUFFICIENT TO HYDROGENATE SAID UNSATURATED HYDROCARBONS TO PARAFFINIC MATERIALS AND CONVERT SAID CONCENTRATE SUBSTANTIALLY TO A HIGH PURITY TETRAHYDROFURAN PRODUCT.
Claim 3
Dependent Claim
43 words
A process according to claim 1 wherein said furan concentrate is separated into a fraction boiling above about 80*C and a fraction boiling below about 80*C and further wherein the fraction boiling below about 80*C is contacted with zinc oxide prior to hydrogenation.
Claim 4
Dependent Claim
52 words
A process according to claim 1 wherein the furan concentrate is contacted with zinc oxide and the effluent from the zinc oxide treatment separated into a fraction boiling above 80*C and a fraction boiling below 80*C with the further proviso that the fraction boiling below about 80*C is then subjected to hydrogenation.
Claim 5
Dependent Claim
20 words
A process according to claim 1 wherein hydrogen is added to the furan concentrate prior to contacting with zinc oxide.
Claim 6
Dependent Claim
40 words
A process according to claim 1 wherein said furan concentrate is subjected to distillation to remove overhead a fraction boiling below about 80*C which fraction is then contacted with zinc oxide in the presence of added hydrogen prior to hydrogenation.
Claim 7
Dependent Claim
60 words
A process according to claim 1 wherein said furan concentrate is obtained from the effluent of an oxidative dehydrogenation process and the concentrate contains in addition oxygenated hydrocarbons as contaminants and is subjected to distillation to remove overhead materials boiling below about 80*C and then contacted with zinc oxide in the presence of added hydrogen before being passed to hydrogenation.
Claim 8
Dependent Claim
45 words
A process according to claim 1 wherein said hydrogenation is carried out under temperature conditions of 100*-400*F and in the presence of a cobalt, nickel or ruthenium catalyst effective for hydrogenating the unsaturated hydrocarbon materials present to paraffinic materials and to convert furan to tetrahydrofuran.
Claim 9
Dependent Claim
23 words
A process according to claim 1 wherein the zinc oxide has been treated with a base prior to contacting with the furan concentrate.
Claim 10
Dependent Claim
31 words
A process according to claim 8 wherein the base is sodium hydroxide and the amount of base added to the zinc oxide is in the range 1 to 10 weight percent.
References Cited (Backward Citations)
US2338941A
Cited
US3021342A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |