US3674886A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preventing double bond migration of mono-olefinic hydrocarbons in selective hydrogenation
Assignee: Maruzen Petrochemical Co Ltd
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Filing: 1971-01-22
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Granted: 1972-07-04
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Expires: 1991-01-22
Abstract
Abstract A method of preventing double bond migration of a mono-olefin hydrocarbon during the selective hydrogenation of a polyunsaturated hydrocarbon coexisting with a mono-olefinic hydrocarbon, each of the mono-olefinic hydrocarbons and polyunsaturated hydrocarbons having at least four carbon atoms, in the presence of hydrogen, using a palladium- or nickelhydrogenation catalyst, which comprises adding carbon monoxide to the reaction system in an amount of from 1 to 50 mol. % based on said hydrogen during the initial stage of the selective hydrogenation reaction and following the initial stage, lowering the content of carbon monoxide to a range of from 0.05-1 mol. % based on the hydrogen.
Inventors
- 👤 Youji Komatsu
- 👤 Yasuhiro Furukawa
- 👤 Takashi Yokomizo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:50
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/148; C07C7/163; C07C5/00; C07C5/02; C07C5/03; C07C2523/00; C07C2523/38; C07C2523/40; C07C2523/44; C07C2523/70; C07C2523/74; C07C2523/755; Y; Y10; Y10S; Y10S585/00; Y10S585/949; Y10S585/951; Y10S585/952
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
32 words
The process of claim 1, wherein the carbon monoxide is present in an amount of from 5 to 30 mol. % based on the hydrogen during the initial stage of the reaction.
Claim 2
Dependent Claim
37 words
The process of claim 1, wherein the content of carbon monoxide is lowered after the total amount of carbon monoxide added into the reaction system comes to at least 0.05 moles per gram of the hydrogenation catalyst.
Claim 3
Dependent Claim
37 words
The process of claim 1, wherein the content of carbon monoxide is lowered after the total amount of carbon monoxide added into the reaction system comes to at least 0.1-20 moles per gram of the hydrogenation catalyst.
Claim 4
Dependent Claim
37 words
The process of claim 1, wherein the content of carbon monoxide is lowered after the total amount of carbon monoxide added into the reaction system comes to at least 0.2-10 moles per gram of the hydrogenation catalyst.
Claim 5
Dependent Claim
20 words
The process of claim 1, wherein the hydrogenation is carried out at a temperature of from 20* to 250* C.
Claim 6
Dependent Claim
20 words
The process of claim 1, wherein the hydrogenation is carried out under a pressure of from atmospheric to 50 kg/cm2.
Claim 7
Dependent Claim
24 words
The process of claim 1, wherein the hydrocarbon mixture is a mixture of compounds having from 4 to 16 carbon atoms in the molecule.
Claim 8
Dependent Claim
13 words
The process of claim 8, wherein the hydrocarbon mixture is a C4 fraction.
Claim 9
Dependent Claim
13 words
The process of claim 8, wherein the hydrocarbon mixture is a C5 fraction.
Claim 10
Dependent Claim
12 words
The process of claim 1, wherein the hydrocarbon mixture contains paraffinic hydrocarbons.
Claim 11
Dependent Claim
13 words
The process of claim 1, wherein the catalyst is supported on a carrier.
Claim 12
Dependent Claim
13 words
The process of claim 12, wherein the catalyst is palladium supported on alumina.
Claim 13
Dependent Claim
13 words
The process of claim 12, wherein the catalyst is nickel supported on alumina.
Claim 14
Dependent Claim
17 words
The process of claim 1, wherein the amount of palladium catalyst present ranges from 0.005-3.0% by weight.
Claim 15
Dependent Claim
17 words
The process of claim 1, wherein the amount of nickel catalyst present ranges from 1-40% by weight.
Claim 16
Dependent Claim
20 words
The process of claim 1, wherein the amount of hydrogen per total mole of polyunsaturated hydrocarbons ranges from 1-20,000 moles.
Claim 17
Dependent Claim
20 words
The process of claim 1, wherein the liquid hourly space velocity of the hydrocarbon feed ranges from 0.1 to 40.0.
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) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |