US3872180A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing isopentene
Assignee: Ube Corp
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Filing: 1974-06-06
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Granted: 1975-03-18
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Expires: 1994-06-06
Abstract
Abstract Isopentene is produced in a high yield by the method wherein a hydrocarbon mixture containing isobutene and n-butene is brought into contact with a catalyst which has been prepared by depositing a molybdenum compound and at least one additional metal compound such as cobalt, tin, silver, zinc, cadmium, lead, bismuth or antimony compound, on an alumina carrier and calcining the compounds, deposited thereon, the contact being carried out in the presence of steam in an amount of 0.1 to 25% based on the volume of the hydrocarbon mixture and calculated in terms of volume under standard conditions of 0*C and 760 mmHg in order to disproportionate the hydrocarbon mixture, and the resultant isopentene is isolated from the reaction mixture.
Inventors
- 👤 Shunsuke Nakatomi
- 👤 Yasuhiko Kohtoku
- 👤 Tosihiro Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:14
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J23/88; B01J23/882; B01J23/16; B01J23/24; B01J23/28; B01J23/38; B01J23/54; B01J23/66; B01J23/68; B01J23/683; B01J23/686; C; C07; C07C; C07C6/00; C07C6/02; C07C6/04
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
124 words
A METHOD FOR PRODUCING ISOPENTENE COMPRISING THE STEPS OF: BRINGING A HYDROCARBON MIXTURE CONTAINING ISOBUTENE AND N-BUTENE INTO CONTACT, AT A TEMPERATURE OF 220*C TO 380*C, WITH A CATALYST WHICH HAS BEEN PREPARED BY DEPOSITING A MOLYBDENUM COMPOUND AND AT LEAST ONE ADDITIONAL METAL COMPOUND SELECTED FROM THE GROUP CONSISTING OF COBALT, TIN, SILVER, ZINC, CADMIUM, LEAD, BISMUTH AND ANTIMONY COMPOUNDS ON AN ALUMINA CARRIER AND CALCINING THE COMPOUND DEPOSITED, THEREON THE CONTACT BEING CARRIED OUT IN THE PRESENCE OF STEAM IN AN AMOUNT OF 0.1 TO 25% BASED ON THE VOLUME OF SAID HYDROCARBON MIXTURE AND CALCULATED IN TERMS OF VOLUME UNDER STANDARD CONDITIONS OF A TEMPERATURE OF 0*C AND A PRESURE OF 760 MMHG, ISOLATING THE RESULTANT ISOPENTENE FROM THE REACTION MIXTURE.
Claim 2
Independent Claim
124 words
A METHOD FOR PRODUCING ISOPENTENE COMPRISING THE STEPS OF: BRINGING A HYDROCARBON MIXTURE CONTAINING ISOBUTENE AND N-BUTENE INTO CONTACT, AT A TEMPERATURE OF 220*C TO 380*C, WITH A CATALYST WHICH HAS BEEN PREPARED BY DEPOSITING A MOLYBDENUM COMPOUND AND AT LEAST ONE ADDITIONAL METAL COMPOUND SELECTED FROM THE GROUP CONSISTING OF COBALT, TIN, SILVER, ZINC, CADMIUM, LEAD, BISMUTH AND ANTIMONY COMPOUNDS ON AN ALUMINA CARRIER AND CALCINING THE COMPOUND DEPOSITED, THEREON THE CONTACT BEING CARRIED OUT IN THE PRESENCE OF STEAM IN AN AMOUNT OF 0.1 TO 25% BASED ON THE VOLUME OF SAID HYDROCARBON MIXTURE AND CALCULATED IN TERMS OF VOLUME UNDER STANDARD CONDITIONS OF A TEMPERATURE OF 0*C AND A PRESURE OF 760 MMHG, ISOLATING THE RESULTANT ISOPENTENE FROM THE REACTION MIXTURE.
Claim 3
Dependent Claim
19 words
A method as claimed in claim 1, wherein said hydrocarbon mixture contains more than 30% by weight of isobutene.
Claim 4
Dependent Claim
23 words
A method as claimed in claim 2, wherein said content of isobutene in said hydRocarbon mixture is between 30 and 60% by weight.
Claim 5
Dependent Claim
45 words
A method as claimed in claim 1, wherein said catalyst contains 5 to 20% of said calcined molybdenum compound and 0.5 to 10% of said calcined additional metal compound based on the weight of said alumina carrier and calculated in terms of oxides corresponding thereto.
Claim 6
Dependent Claim
37 words
A method as claimed in claim 4, wherein the content of said calcined additional metal compound is 1 to 5% based on the weight of said alumina carrier and calculated in terms of the oxide corresponding thereto.
Claim 7
Dependent Claim
40 words
A method as claimed in claim 1, wherein said additional metal compound is selected from the group consisting of halides, sulfates, nitrates, carbonates, hydroxides, oxides, hydroxycarbonates and organic acid salts of cobalt, tin, silver, zinc, cadmium, lead, bismuth and antimony.
Claim 8
Dependent Claim
18 words
A method as claimed in claim 1, wherein said alumina carrier has a 2 to 100 mesh size.
Claim 9
Dependent Claim
19 words
A method as claimed in claim 7, wherein said mesh size of said alumina carrier is 5 to 50.
Claim 10
Dependent Claim
16 words
A method as claimed in claim 1, wherein said alumina carrier consists of an activated alumina.
Claim 11
Dependent Claim
18 words
A method as claimed in claim 9, wherein said activated alumina is either gamma -alumina or eta -alumina.
Claim 12
Dependent Claim
28 words
A method as claimed in claim 1, wherein said molybdenum compound is selected from the group consisting of molybdenum oxide, ammonium molybdate, molybdenum chloride and molybdenum oxide chloride.
Claim 13
Dependent Claim
28 words
A method as claimed in claim 1, wherein said deposition of molybdenum compound and said additional metal compound on said alumina carrier is effected by an impregnation method.
Claim 14
Dependent Claim
38 words
A method as claimed in claim 1, wherein said calcining of said molybdenum compound and said additional metal compound deposited on said alumina carrier is effected at a temperature of 300* to 1000*C for 3 to 10 hours.
Claim 15
Dependent Claim
15 words
A method as claimed in claim 13, wherein said calcining temperature is 500* to 700*C.
Claim 16
Dependent Claim
15 words
A method as claimed in claim 1, wherein said calcining is carried out in air.
Claim 17
Dependent Claim
41 words
A method as claimed in claim 1, wherein said hydrocarbon mixture is brought into contact with said catalyst at a flow rate of 50 to 2000 cm3/hr, calculated in terms of volume under standard conditions, per 1 cm3 of said catalyst.
Claim 18
Dependent Claim
21 words
A method as claimed in claim 16, wherein said flow rate of said hydrocarbon mixture is 100 to 1000 cm3/cm3. catalyst/hr.
Claim 19
Dependent Claim
37 words
A method as claimed in claim 1, wherein said steam is fed at a feed rate of 0.2 to 10% based on the volume of said hydrocarbon mixture and calculated in terms of volume under standard conditions.
Claim 20
Dependent Claim
39 words
A method as claimed in claim 1, wherein said catalyst is treated with an inert gas containing 0.1 to 25% by volume of steam calculated in terms of volume under standard conditions, at a temperature of 100 to 300*C.
Claim 21
Dependent Claim
22 words
A method as claimed in claim 1, wherein the contact temperature of said hydrocarbon mixture with said catalyst is 230* to 350*C.
Claim 22
Dependent Claim
26 words
A method as claimed in claim 1, wherein said isolation of said resultant isopentene is carried out by distillation at a temperature of 20* to 40*C.
Claim 23
Dependent Claim
26 words
A method as claimed in claim 1, wherein said disproportionation step is carried out under normal pressure or under a pressurized condition up to 10 Kg/cm2G.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |