Patent US3928462A successfully refreshed from Google Patents.
US3928462A
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US
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Catalytic process for the preparation of methacrolein
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1971-07-02
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Granted: 1975-12-23
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Expires: 1991-07-02
Abstract
Abstract A process for the preparation of methacrolein by the vapor phase oxidation of isobutylene which comprises contacting isobutylene and oxygen with a catalyst composition comprising a catalyst system of the formula: MoaBibFecNidTleXfPgOh wherein X is one or more of Mn, Mg and Co and a, b, c, d, e, f, g and h represent respectively the number of atoms, wherein a is 12, b is 0.1 to 5, c is 0.1 to 5, d is 0.1 to 12, e is 1 or less but not O, f is 0 to 12, g is 0 to 5 and h is from 36 to 89. By such process, methacrolein is produced in a high selectivity and an excellent yield per each pass even at a large space velocity.
Inventors
- 👤 Tatsuo Shiraishi
- 👤 Susumu Kishiwada
- 👤 Shinkichi Shimizu
- 👤 Shigeru Honmaru
- 👤 Hiroshi Ichihashi
- 👤 Yoshihiko Nagaoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:12
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J23/88; B01J23/887; B01J23/8874; B01J23/8876; B01J27/00; B01J27/14; B01J27/186; B01J27/188; B01J27/19; B01J27/192; C; C07; C07C; C07C45/00; C07C45/27; C07C45/32; C07C45/33; C07C45/34; C07C45/35; B01J2523/00
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
40 words
A PROCESS FOR THE PREPARATION OF METHACROLEIN BY THE VAPOR PHASE OXIDATION OF ISOBUTYLENE WHICH COMPRISES CONTACTING ISOBUTYLENE AND OXYGEN AT A TEMPERATURE FROM 250* TO 500*C. WITH A CATALYST COMPOSITION CONSISTING ESSENTIALLY OF A CATALYST SYSTEM OF THE FORMULA:
Claim 2
Dependent Claim
40 words
A PROCESS FOR THE PREPARATION OF METHACROLEIN BY THE VAPOR PHASE OXIDATION OF ISOBUTYLENE WHICH COMPRISES CONTACTING ISOBUTYLENE AND OXYGEN AT A TEMPERATURE FROM 250* TO 500*C. WITH A CATALYST COMPOSITION CONSISTING ESSENTIALLY OF A CATALYST SYSTEM OF THE FORMULA:
Claim 3
Dependent Claim
46 words
The process according to claim 1, wherein a is 12, b is 0.5 to 3, c is 0.5 to 5, d is 1.5 to 12, e is 0.01 to 0.7, f is 0 to 9.0, g is 0.01 to 2 and h is 39 to 75.
Claim 4
Dependent Claim
14 words
The process according to claim 1, wherein, d plus f is 2 to 15.
Claim 5
Dependent Claim
23 words
The process according to claim 1, wherein the molar ratio of the starting materials is isobutylene : oxygen 1.0 : 0.5 to 6.
Claim 6
Dependent Claim
23 words
The process according to claim 1, wherein the molar ratio of the starting materials is isobutylene : oxygen 1.0 : 1.0 to 4.0.
Claim 7
Dependent Claim
18 words
The process according to claim 1, wherein the contact is effected at a temperature from 300* to 450*C.
Claim 8
Dependent Claim
21 words
The process according to claim 1, wherein the contact is effected at a space velocity of 100 to 12,000 hr 1.
Claim 9
Dependent Claim
21 words
The process according to claim 1, wherein the contact is effected at a space velocity of 300 to 6000 hr 1.
Claim 10
Dependent Claim
20 words
The process according to claim 1, wherein the contact is effected under a pressure of 0.5 to 10 absolute atmosphere.
Claim 11
Dependent Claim
16 words
The process according to claim 1, wherein the contact is effected in the presence of steam.
Claim 12
Dependent Claim
25 words
The process according to claim 10, wherein the steam is employed in a rate of not more than 15 mol per 1 mol of isobutylene.
Claim 13
Dependent Claim
17 words
The process according to claim 1, wherein air enhanced oxygen concentration is employed as the oxygen source.
Claim 14
Dependent Claim
14 words
The process according to claim 1, wherein air is employed as the oxygen source.
Claim 15
Dependent Claim
28 words
The process according to claim 1, wherein the reaction is effected in the presence of a diluent selected from the group consisting of nitrogen, carbon dioxide and argon.
Claim 16
Dependent Claim
28 words
The process according to claim 1, wherein the catalyst composition is incorporated with a carrier selected from the group consisting of silica, alumina, silicon carbide and titanium oxide.
Claim 17
Dependent Claim
23 words
The process according to claim 15, wherein the amount of the carrier is less than 90 % by weight of the catalyst composition.
Claim 18
Dependent Claim
24 words
The process according to claim 16, wherein the amount of the carrier is from 5 to 90 % by weight of the catalyst composition.
Claim 19
Dependent Claim
119 words
A process for the preparation of methacrolein by the vapor phase oxidation of isobutylene which comprises contacting isobutylene and oxygen at a temperature from 250* to 500*C. and at a space velocity of 100 to 12,000 hr 1 with a catalyst composition consisting essentially of a catalyst system of the formula: MoaBibFecNidTleXfPgOh wherein X is Mn, Mg or Co or a combination thereof and a, b, c, d, e, f, g and h represent respectively the number of atoms wherein a is 12, b is 0.5 to 3, c is 0.5 to 5, d is 1.5 to 12, e is 0.01 to 0.7, f is 0 to 9.0, g is 0.01 to 2 and h is 39 to 75.
Claim 20
Dependent Claim
119 words
A process for the preparation of methacrolein by the vapor phase oxidation of isobutylene which comprises contacting isobutylene and oxygen at a temperature from 250* to 500*C. and at a space velocity of 100 to 12,000 hr 1 with a catalyst composition consisting essentially of a catalyst system of the formula: MoaBibFecNidTleXfPgOh wherein X is Mn, Mg or Co or a combination thereof and a, b, c, d, e, f, g and h represent respectively the number of atoms wherein a is 12, b is 0.5 to 3, c is 0.5 to 5, d is 1.5 to 12, e is 0.01 to 0.7, f is 0 to 9.0, g is 0.01 to 2 and h is 39 to 75.
Claim 21
Dependent Claim
23 words
The process according to claim 18, wherein the molar ratio of the starting materials is isobutylene : oxygen 1.0 : 1.0 to 4.0.
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) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |