US3878260A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing conjugated diolefins
Assignee: Individual
•
Filing: 1973-08-27
•
Granted: 1975-04-15
•
Expires: 1993-08-27
Abstract
Abstract A process for producing a conjugated diolefin, which comprises reacting a C4 8 mono-olefin having a linear chain of at least four carbon atoms with molecular oxygen at an elevated temperature in the presence of a catalyst consisting essentially of (1) a platinum group metal catalyst and (2) a salt of an alkali or alkaline earth metal wherein an anion which constitutes said salt is an inorganic acid radical which contains an element selected from the group consisting of halogen, sulfur, nitrogen, phosphorus and boron.
Inventors
- 👤 Taiseki Kunugi
- 👤 Kaoru Fujimoto
- 👤 Hiroaki Takashima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:23
CPC Classifications
C; C07; C07C; C07C5/00; C07C5/42; C07C5/48
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
99 words
A PROCESS FOR PRODUCING A CONJUGATED DIOLEFIN, WHICH COMPRISES REACTING S FIRST REACTANT CONSISTING ESSENTIALLY OF A C4-8 MONO-OLEFIN HAVING A LINEAR CHAIN OF AT LEAST FOUR CARBON ATOMS WITH A SECOND REACTANT CONSISTING ESSENTIALLY OF MOLECULAR OXYGEN AT A TEMPERATURE OF 170*C. - 330*C. IN THE PRESENCE OF A CATALYST CONSISTING ESSENTIALLY OF (1) A PLATINUM GROUP METAL CATALYST AND (2) A SALT OF AN ALKALI OR ALKALINE EARTH METAL WHEREIN AN ANION WHICH CONSTITUTES SAID SALT IS AN INORGANIC ACID RADICAL WHICH CONTAINS AN ELEMENT SELECTED FROM THE GROUP CONSISTING OF HALOGEN, SULFUR, NITROGEN, PHOSPHORUS AND BORON.
Claim 2
Dependent Claim
99 words
A PROCESS FOR PRODUCING A CONJUGATED DIOLEFIN, WHICH COMPRISES REACTING S FIRST REACTANT CONSISTING ESSENTIALLY OF A C4-8 MONO-OLEFIN HAVING A LINEAR CHAIN OF AT LEAST FOUR CARBON ATOMS WITH A SECOND REACTANT CONSISTING ESSENTIALLY OF MOLECULAR OXYGEN AT A TEMPERATURE OF 170*C. - 330*C. IN THE PRESENCE OF A CATALYST CONSISTING ESSENTIALLY OF (1) A PLATINUM GROUP METAL CATALYST AND (2) A SALT OF AN ALKALI OR ALKALINE EARTH METAL WHEREIN AN ANION WHICH CONSTITUTES SAID SALT IS AN INORGANIC ACID RADICAL WHICH CONTAINS AN ELEMENT SELECTED FROM THE GROUP CONSISTING OF HALOGEN, SULFUR, NITROGEN, PHOSPHORUS AND BORON.
Claim 3
Dependent Claim
33 words
The process of claim 1, wherein the amount of the salt of alkali or alkaline earth metal is 0.1 - 8 g-equivalent per gram-atom of metallic element of the platinum group metal catalyst.
Claim 4
Dependent Claim
15 words
The process of claim 1, wherein the reaction is carried out in the vapor phase.
Claim 5
Dependent Claim
33 words
The process of claim 3, wherein the amount of salt of the alkali or alkaline earth metal is 0.1 - 8 g-equivalent per gram-atom of metallic element of the platinum group metal catalyst.
Claim 6
Dependent Claim
13 words
The process of claim 3, wherein the source of molecular oxygen is air.
Claim 7
Dependent Claim
15 words
The process of claim 3, wherein an inert gas is introduced into the reaction zone.
Claim 8
Dependent Claim
13 words
The process of claim 3, wherein steam is introduced into the reaction zone.
Claim 9
Dependent Claim
13 words
The process of claim 3, wherein the catalyst is deposited on a support.
Claim 10
Dependent Claim
19 words
The process of claim 3, wherein the platinum group metal catalyst is used in the form of elemental metal.
Claim 11
Dependent Claim
14 words
The process of claim 9, wherein the platinum group metal catalyst is metallic palladium.
Claim 12
Dependent Claim
22 words
The process of claim 3, wherein the platinum group metal catalyst is used in the form of a compound of the metal.
Claim 13
Dependent Claim
23 words
The process of claim 3, wherein the salt of the alkali or alkaline earth metal is an alkali or alkaline earth metal halide.
Claim 14
Dependent Claim
25 words
The process of claim 12, wherein the salt of alkali or alkaline earth metal halide is an alkali or alkaline earth metal chloride or bromide.
Claim 15
Dependent Claim
34 words
The process of claim 3, wherein the platinum group metal catalyst is metallic palladium, and the salt of an alkali or alkaline earth metal is an alkali or alkaline earth metal chloride or bromide.
Claim 16
Dependent Claim
13 words
The process of claim 13, wherein the catalyst is deposited on a support.
Claim 17
Dependent Claim
12 words
The process of claim 3, wherein the mono-olefin is n-butene or isopentene.
Claim 18
Dependent Claim
15 words
The process of claim 1, wherein the reaction is carried out in the liquid phase.
Claim 19
Dependent Claim
19 words
The process of claim 3, wherein the proportions of the mono-olefin and molecular oxygen, on a molar basis, are:
Claim 20
Dependent Claim
20 words
The process of claim 7, wherein the proportions of the mono-olefin, molecular oxygen, and steam, on a molar basis, are:
References Cited (Backward Citations)
US3205280A
Cited
US3156735A
Cited
US3260767A
Cited
US3268612A
Cited
US3439058A
Cited
US3308198A
Cited
US3308193A
Cited
US3308188A
Cited
US3437703A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |