US4230897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for selectively hydrogenating a hydrocarbon cut containing at least one diolefinic hydrocarbon and at least one acetylenic hydrocarbon using a palladium catalyst with crystallites of at least 50 angstroms
Assignee: IFP Energies nouvelles
•
Filing: 1979-04-04
•
Granted: 1980-10-28
•
Expires: 1999-04-04
Abstract
Abstract Process for selectively hydrogenating acetylenic hydrocarbons such as vinylacetylene contained in an unsaturated hydrocarbon fraction such as a C 4 fraction also containing a diolefinic hydrocarbon such as butadiene, without substantially hydrogenating said diolefinic hydrocarbon, comprising the step of contacting said fraction, at least partially in the liquid phase, in the presence of hydrogen, with a catalyst of palladium on alumina whose palladium crystallites have an average size of at least 50 Angstroms, said step being optionally followed with a step of contacting the resultant fraction from the preceding step, in the presence of hydrogen, with a catalyst of palladium an alumina whose palladium crystallites have an average size of at most 45 Angstroms.
Inventors
- 👤 Jean Cosyns
- 👤 Robert Stern
- 👤 Jean-Francois Le Page
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:34
CPC Classifications
C; C07; C07C; C07C5/00; C07C5/02; C07C5/08; B; B01; B01J; B01J23/00; B01J23/38; B01J23/40; B01J23/44; C07C2521/00; C07C2521/02; C07C2521/04; C07C2523/00; C07C2523/38; C07C2523/40; C07C2523/44
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
88 words
In a process for selectively hydrogenating a hydrocarbon fraction containing simultaneously at least one diolefinic hydrocarbon and at least one acetylenic hydrocarbon, including the hydrogenation of the acetylenic hydrocarbon but without substantial hydrogenation of the diolefinic hydrocarbon, wherein said fraction, at least partially in the liquid phase, and hydrogen are contacted with a catalyst of palladium on alumina, the improvement wherein the average size of the palladium crystallites in said catalyst is of at least 50 Angstroms, whereby the selective hydrogenating activity of the catalyst is substantially prolonged.
Claim 2
Dependent Claim
88 words
In a process for selectively hydrogenating a hydrocarbon fraction containing simultaneously at least one diolefinic hydrocarbon and at least one acetylenic hydrocarbon, including the hydrogenation of the acetylenic hydrocarbon but without substantial hydrogenation of the diolefinic hydrocarbon, wherein said fraction, at least partially in the liquid phase, and hydrogen are contacted with a catalyst of palladium on alumina, the improvement wherein the average size of the palladium crystallites in said catalyst is of at least 50 Angstroms, whereby the selective hydrogenating activity of the catalyst is substantially prolonged.
Claim 3
Dependent Claim
20 words
A process according to claim 1, wherein the hydrocarbon fraction is an unsaturated C 4 fraction containing butadiene and vinylacetylene.
Claim 4
Dependent Claim
39 words
A process according to claim 1, wherein the hydrocarbon fraction contains from 20 to 50% by weight of butadiene, from 40 to 80% by weight of butane, butenes and/or isobutene and at least 1% by weight of acetylenic hydrocarbons.
Claim 5
Dependent Claim
31 words
A process according to claim 1, wherein the catalyst is obtained by admixing alumina with at least one palladium compound and subsequently heating at a temperature from 650° to 1100° C.
Claim 6
Dependent Claim
14 words
A process according to claim 4, wherein the heating is conducted at 750°-950° C.
Claim 7
Dependent Claim
17 words
A process according to claim 4, wherein the heating is conducted in a free oxygen containing atmosphere.
Claim 8
Dependent Claim
19 words
A process according to one of claim 4, wherein the heating is followed with a reduction treatment with hydrogen.
Claim 9
Dependent Claim
60 words
A process according to claim 1 wherein after having been contacted with the catalyst in a catalyst bed whose average palladium crystallite size is of at least 50 Angstroms, the hydrocarbon fraction and hydrogen are contacted in a further catalyst bed having a catalyst of palladium on alumina whose palladium crystallites have an average size of at most 45 Angstroms.
Claim 10
Dependent Claim
37 words
A process according to claim 8 wherein from 5 to 70% of the total volume of the two catalyst beds correspond to the catalyst bed having an average size of the crystallites of at least 50 Angstroms.
Claim 11
Dependent Claim
37 words
A process according to claim 8, wherein from 10 to 50% of the total volume of the two catalyst beds correspond to the catalyst bed having an average size of the crystallites of at least 50 Angstroms.
Claim 12
Dependent Claim
64 words
A process according to claim 8, wherein a hydrocarbon C 4 cut containing simultaneously butadiene and acetylenic hydrocarbons is treated under such operating conditions as to convert from 50 to 90% of the vinylacetylene in contact with the first catalyst bed and then to proceed to a further conversion of the vinylacetylene up to 94% or more, in contact with the second catalyst bed.
Claim 13
Dependent Claim
20 words
A process according to claim 11, wherein 60-85% of the vinylacetylene is converted in contact with the first catalyst bed.
Claim 14
Dependent Claim
18 words
A process according to claim 1, wherein the average size of the palladium crystallites is about 80 Angstroms.
Claim 15
Dependent Claim
42 words
A process according to claim 11, wherein the average size of the palladium crystallites in the first mentioned catalyst bed is about 80 Angstroms, and the average size of the palladium crystallites in the second mentioned catalyst bed is about 35 Angstroms.
Claim 16
Dependent Claim
16 words
The process of claim 1, wherein the acetylenic hydrocarbon content is at least 1% by weight.
Claim 17
Dependent Claim
18 words
The process of claim 4, wherein alumina has a specific surface from 1 to 100 m 2 /g.
References Cited (Backward Citations)
GB832200A
Cited
US3116342A
Cited
GB1175148A
Cited
US3898298A
Cited
US3969267A
Cited
US4093643A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-10-28 | 1984-04-28 | 1984-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-28 | 1988-04-28 | 1988-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-28 | 1992-04-28 | 1992-10-28 | $7700.00 | Window Closed / Lapsed |