Patent US2798081A successfully refreshed from Google Patents.
US3922318A
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Process for purifying butadiene and isoprene by selective hydrogenation of the acetylenic impurities contained therein
Assignee: IFP Energies nouvelles
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Filing: 1974-03-12
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Granted: 1975-11-25
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Expires: 1994-03-12
Abstract
Abstract A liquid phase containing butadiene and/or isoprene and acetylenic impurities is contacted with hydrogen, in the presence of a hydrogenation catalyst containing at least one non-noble metal from any of groups IVA to VIIA or VIII, the liquid phase also containing cyclopentadiene and the temperature being lower than 80*C.
Inventors
- 👤 Germain Martino
- 👤 Robert Stern
- 👤 Jean Cosyns
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:56
CPC Classifications
B; B01; B01J; B01J31/00; B01J31/02; B01J31/04; B01J31/12; B01J31/14; B01J31/143; B01J31/26; C; C07; C07C; C07C7/00; C07C7/148; C07C7/163; C07C7/167; B01J2231/00; B01J2231/60; B01J2231/64; B01J2231/641; B01J2231/645
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
89 words
IN A PROCESS FOR SELECTIVELY HYDROGENATING ACETYLENIC HYDROCARBON IMPURITIES CONTAINED IN A DIOLEFIN SELECTED FROM THE GROUP CONSISTING OF BUTADIENE, ISOPRENE AND MIXTURES THEREOF, WHEREIN SAD DIOLEFIN IN LIQUID PHASE IS REACTED WITH HYDROGEN AT A TEMPERATURE LOWER THAN 80*C IN THE PRESENC OF A HYDROGENATION CATALYST CONTAINING AT LEAST ONE METAL SELECTED FROM THE GROUP CONSISTING OF IRON, MOLYBDENYM AND COBALT, THE IMPROVEMENT COMPRISING CONDUCTING SAID HYDROGENATING IN THE ADDITIONAL PRESENCE OF CYCLOPENTADIENE IN AN AMOUNT OF 0.1 TO 10 TIMES BY WEIGHT THE AMOUNT OF SAID DIOLEFIN.
Claim 2
Dependent Claim
89 words
IN A PROCESS FOR SELECTIVELY HYDROGENATING ACETYLENIC HYDROCARBON IMPURITIES CONTAINED IN A DIOLEFIN SELECTED FROM THE GROUP CONSISTING OF BUTADIENE, ISOPRENE AND MIXTURES THEREOF, WHEREIN SAD DIOLEFIN IN LIQUID PHASE IS REACTED WITH HYDROGEN AT A TEMPERATURE LOWER THAN 80*C IN THE PRESENC OF A HYDROGENATION CATALYST CONTAINING AT LEAST ONE METAL SELECTED FROM THE GROUP CONSISTING OF IRON, MOLYBDENYM AND COBALT, THE IMPROVEMENT COMPRISING CONDUCTING SAID HYDROGENATING IN THE ADDITIONAL PRESENCE OF CYCLOPENTADIENE IN AN AMOUNT OF 0.1 TO 10 TIMES BY WEIGHT THE AMOUNT OF SAID DIOLEFIN.
Claim 3
Dependent Claim
17 words
A process according to claim 1, wherein the temperature is 10*-50*C and the hydrogen pressure 0.2-70 bars.
Claim 4
Dependent Claim
31 words
A process according to claim 1, wherein the hydrogenation catalyst is the product obtained by reacting an iron, molybdenum or cobalt compound with a metal hydride or an organo metal compound.
Claim 5
Dependent Claim
11 words
A process according to claim 1, wherein the catalyst contains iron.
Claim 6
Dependent Claim
19 words
A process according to claim 4, wherein the catalyst is a reaction mixture of an iron salt and triethylaluminum.
Claim 7
Dependent Claim
11 words
A process according to claim 1, wherein the catalyst contains molybdenum.
Claim 8
Dependent Claim
19 words
A process according to claim 6 wherein the catalyst is a reaction mixture of a molybdenum salt and triethylaluminum.
Claim 9
Dependent Claim
13 words
A process according to any of claim 1, wherein the catalyst contains cobalt.
Claim 10
Dependent Claim
15 words
A process according to claim 1, wherein the liquid phase is a C5 pyrolysis cut.
Claim 11
Dependent Claim
19 words
A process according to claim 1, wherein the liquid phase is a mixture of C4 and C5 pyrolysis cuts.
Claim 12
Dependent Claim
20 words
A process according to claim 1, wherein the amount of cyclopentadiene in the liquid phase is 1-40 % by weight.
Claim 13
Dependent Claim
20 words
A process according to claim 1 wherein the amount of cyclopentadiene in the liquid phase is 5-40 % by weight.
Claim 14
Dependent Claim
15 words
A process according to claim 1, wherein the catalyst is soluble in the liquid phase.
Claim 15
Dependent Claim
19 words
A process according to claim 1, wherein the catalyst is in the solid state and arranged in fixed bed.
Claim 16
Dependent Claim
24 words
A process according to claim 1, wherein the molar ratio of hydrogen to the acetylenic hydrocarbons is 1 : 1 to 1,000 : 1.
Claim 17
Dependent Claim
23 words
A process according to claim 1, wherein over 90% of the acetylenic impurities are hydrogenated together with an insignificant amount of the diolefin.
Claim 18
Dependent Claim
19 words
A process according to claim 16, wherein resultant hydrogenated liquid contains less than 100 p.p.m. of said acetylenic impurities.
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) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |