US4039583A
Expired / Lapsed
US
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Process for producing methacrolein
Assignee: JSR Corp
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Filing: 1975-12-02
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Granted: 1977-08-02
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Expires: 1995-12-02
Abstract
Abstract In a process for producing methacrolein by the gas phase catalytic reaction of isobutene with molecular oxygen in the presence of a catalyst consisting of Mo, Bi, Fe, Co, Sb and O, the catalyst is prepared by using as the Sb component, a mixture of a trivalent Sb compound and a pentavalent Sb compound. When said catalyst is used, the reaction can be continued over a long period of time without formation of complete oxidation products, i.e. CO and CO 2 , and, even when the starting isobutene contains n-butene, the reaction proceeds smoothly to make it possible to produce methacrolein and 1,3-butadiene simultaneously.
Inventors
- 👤 Masato Kawakami
- 👤 Naoki Andoh
- 👤 Akira Iio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:58
CPC Classifications
C; C07; C07C; C07C5/00; C07C5/42; C07C5/48; B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J23/88; B01J23/887; B01J23/8876; C07C45/00; C07C45/27; C07C45/32; C07C45/33; C07C45/34; C07C45/35; B01J2523/00
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
162 words
A process for producing methacrolein, or methacrolein and 1,3-butadiene, by the gas phase catalytic reaction of isobutene, or isobutene and n-butene, with molecular oxygen or a molecular oxygen-containing gas in the presence of a catalyst having a composition of the formula, Mo.sub.10 Bi.sub.0.1.sub.-8 Fe.sub.0.1.sub.-10 Co.sub.0.01.sub.-20 Sb.sub.0.01.sub.-5 O.sub.n wherein n is a number defined by the valences of the respective catalyst component elements said number being from 35 to 90, at a temperature of 350° to 550° C., characterized in that the catalyst is prepared by using, as the Sb component, a mixture of a trivalent Sb compound and a pentavalent Sb compound in an antimony atomic ratio of the former to the latter of 0.1/0.9 to 0.95/0.05, wherein the trivalent Sb compound is selected form the group consisting of diantimony trioxide, antimony trichloride, antimony tribromide, antimony (III) oxychloride and antimony (III) pentoxydichloride, and the pentavalent Sb compound is selected from the group consisting of diantimony pentoxide, antimony pentachloride and antimony (v) sulfide.
Claim 2
Dependent Claim
162 words
A process for producing methacrolein, or methacrolein and 1,3-butadiene, by the gas phase catalytic reaction of isobutene, or isobutene and n-butene, with molecular oxygen or a molecular oxygen-containing gas in the presence of a catalyst having a composition of the formula, Mo.sub.10 Bi.sub.0.1.sub.-8 Fe.sub.0.1.sub.-10 Co.sub.0.01.sub.-20 Sb.sub.0.01.sub.-5 O.sub.n wherein n is a number defined by the valences of the respective catalyst component elements said number being from 35 to 90, at a temperature of 350° to 550° C., characterized in that the catalyst is prepared by using, as the Sb component, a mixture of a trivalent Sb compound and a pentavalent Sb compound in an antimony atomic ratio of the former to the latter of 0.1/0.9 to 0.95/0.05, wherein the trivalent Sb compound is selected form the group consisting of diantimony trioxide, antimony trichloride, antimony tribromide, antimony (III) oxychloride and antimony (III) pentoxydichloride, and the pentavalent Sb compound is selected from the group consisting of diantimony pentoxide, antimony pentachloride and antimony (v) sulfide.
Claim 3
Dependent Claim
28 words
A process according to claim 1, wherein the catalyst has a composition of the formula, Mo.sub.10 Bi.sub.0.5.sub.-5 Fe.sub.1.sub.-10 Co.sub.1.sub.-15 Sb.sub.0.1.sub.-3 O.sub.n wherein n is from 35 to 75.
Claim 4
Dependent Claim
42 words
A process according to claim 1, wherein the antimony atomic ratio of the trivalent Sb compound to the pentavalent Sb compound used at the time of preparation of the catalyst is in the range of Sb (III)/Sb (V) = 0.5/0.5 - 0.9/0.1.
Claim 5
Dependent Claim
28 words
A process according to claim 1, wherein the trivalent Sb compound is diantimony trioxide or antimony trichloride, and the pentavalent Sb compound is diantimony pentoxide or antimony pentachloride.
Claim 6
Dependent Claim
17 words
A process according to claim 1, wherein methacrolein is produced by using isobutene as the starting material.
Claim 7
Dependent Claim
21 words
A process according to claim 1, wherein methacrolein and 1,3-butadiene are produced by using isobutene and n-butene as the starting materials.
Claim 8
Dependent Claim
13 words
A process according to claim 1, wherein the molecular oxygen-containing gas is air.
Claim 9
Dependent Claim
21 words
A process according to claim 1, wherein the gas phase catalytic reaction is effected in the presence of an inert gas.
Claim 10
Dependent Claim
12 words
A process according to claim 8, wherein the inert gas is steam.
Claim 11
Dependent Claim
17 words
A process according to claim 9, wherein the ratio of isobutene to steam is 1 : 0.3-100.
Claim 12
Dependent Claim
17 words
A process according to claim 9, wherein the ratio of isobutene to steam is 1 : 0.5-30.
Claim 13
Dependent Claim
25 words
A process according to claim 1, wherein the gas phase catalytic reaction is effected at a temperature in the range from 370° to 500° C.
Claim 14
Dependent Claim
18 words
A process according to claim 1, wherein the ratio of isobutene to molecular oxygen is 1 : 0.5-5.
Claim 15
Dependent Claim
18 words
A process according to claim 1, wherein the ratio of isobutene to molecular oxygen is 1 : 1-3.
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) | 1980-08-01 | 1981-01-31 | 1981-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-01 | 1985-01-31 | 1985-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-01 | 1989-01-31 | 1989-08-02 | $7700.00 | Window Closed / Lapsed |