Patent FR640856A successfully refreshed from Google Patents.
US4171328A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic oxidation of isobutylene
Assignee: Ube Corp
•
Filing: 1978-06-22
•
Granted: 1979-10-16
•
Expires: 1998-06-22
Abstract
Abstract Isobutylene is catalytically oxidized in the vapor phase with molecular oxygen to form methacrolein. The catalyst used consists essentially of metal oxides and is represented by the formula: MoaBibFecCodZreXfTigOh WHEREIN Mo=molybdenum, Bi=bismuth, Fe=iron, Co=cobalt, Zr=zirconium, X=calcium and/or zinc, Ti=titanium and O=oxygen, and the subscripts indicating the atomic ratios of the respective metals to bismuth are: a=5-20, b=1, c=0.2-5, d=1-10, e=0.01-2, f=0.01-2, and g=0.01-1. The catalyst exhibits little or no reduction in mechanical strength during the oxidation reaction and results in an enhanced yield of methacrolein.
Inventors
- 👤 Sumio Umemura
- 👤 Kyoji Ohdan
- 👤 Kenichi Suzuki
- 👤 Terumi Hisayuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:57
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J23/88; B01J23/887; B01J23/8876; C; C07; C07C; C07C45/00; C07C45/27; C07C45/32; C07C45/33; C07C45/34; C07C45/35; B01J2523/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
167 words
In a process for catalytically oxidizing isobutylene at a temperature in the range of from 250° to 500° in the vapor phase with molecular oxygen to form methacrolein, the improvement which comprises passing a gaseous feed comprising isobutylene and molecular oxygen in a catalytic oxidation reaction zone over a catalyst consisting essentially of metal oxides represented by the formula: Mo.sub.a Bi.sub.b Fe.sub.c Co.sub.d Zr.sub.e X.sub.f Ti.sub.g O.sub.h wherein Mo is molybdenum, Bi is bismuth, Fe is iron, Co is cobalt, Zr is zirconium, X is at least one metal selected from the group consisting of calcium and zinc, Ti is titanium and O is oxygen, and each of the subscripts a through g is a positive number indicating an atomic ratio of the respective metal to bismuth and falling within the following ranges: a=5 to 20, b=1, c=0.2 to 5, d=1 to 10, e=0.01 to 2, f=0.01 to 2 and g=0.01 to 1, and h is a positive number satisfying the average valency of the respective metals.
Claim 2
Dependent Claim
167 words
In a process for catalytically oxidizing isobutylene at a temperature in the range of from 250° to 500° in the vapor phase with molecular oxygen to form methacrolein, the improvement which comprises passing a gaseous feed comprising isobutylene and molecular oxygen in a catalytic oxidation reaction zone over a catalyst consisting essentially of metal oxides represented by the formula: Mo.sub.a Bi.sub.b Fe.sub.c Co.sub.d Zr.sub.e X.sub.f Ti.sub.g O.sub.h wherein Mo is molybdenum, Bi is bismuth, Fe is iron, Co is cobalt, Zr is zirconium, X is at least one metal selected from the group consisting of calcium and zinc, Ti is titanium and O is oxygen, and each of the subscripts a through g is a positive number indicating an atomic ratio of the respective metal to bismuth and falling within the following ranges: a=5 to 20, b=1, c=0.2 to 5, d=1 to 10, e=0.01 to 2, f=0.01 to 2 and g=0.01 to 1, and h is a positive number satisfying the average valency of the respective metals.
Claim 3
Dependent Claim
49 words
A process according to claim 1 wherein the atomic ratios of the respective metals to bismuth are such that the subscripts a through g fall within the following ranges: a=7 to 15, b=1, c=0.5 to 4, d=2 to 9, e=0.05 to 1.5, f=0.05 to 1.5 and g=0.02 to 0.8.
Claim 4
Dependent Claim
13 words
A process according to claim 1 wherein X in the formula is calcium.
Claim 5
Dependent Claim
13 words
A process according to claim 1 wherein X in the formula is zinc.
Claim 6
Dependent Claim
26 words
A process according to claim 1 wherein the contact time in the catalytic oxidation reaction zone is in the range of from 0.3 to 20 seconds.
Claim 7
Dependent Claim
20 words
A process according to claim 1 wherein the reaction temperature is in the range of from 300° to 450° C.
Claim 8
Dependent Claim
33 words
A process according to claim 1 wherein the relative proportion of molecular oxygen to isobutylene in the gaseous feed is in the range of from 0.8 to 4 moles per mole of isobutylene.
Claim 9
Dependent Claim
22 words
A process according to claim 1 wherein the gaseous feed further contains 0.1 to 8 moles of steam per mole of isobutylene.
Claim 10
Dependent Claim
49 words
A process according to claim 1 wherein said catalyst metal oxides are the calcined residue of a product formed by mixing in an aqueous medium the respective metal-containing compounds and then drying the mixture; said metal-containing compounds being in the form of an oxide, salt or a mixture thereof.
Claim 11
Dependent Claim
31 words
A process according to claim 9 wherein said calcined residue is obtained by calcining said mixed and dried product at a temperature in the range of from 600° to 800° C.
Claim 12
Dependent Claim
57 words
A process according to claim 9 wherein said drying of the mixture is carried out in two stages, in the first stage of which the mixture is maintained at a temperature of from 100° to 150° C. and in the second stage of which the mixture is maintained at a temperature of from 150° to 300° C.
References Cited (Backward Citations)
US3236787A
Cited
US3600443A
Cited
GB1351646A
Cited
JPS481645U
Cited
JPS4852713A
Cited
JPS5112604A
Cited
JPS5134107A
Cited
JPS5193793A
Cited
US4065507A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-10-15 | 1983-04-16 | 1983-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-15 | 1987-04-16 | 1987-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-15 | 1991-04-16 | 1991-10-16 | $7700.00 | Window Closed / Lapsed |