Patent US4092354A successfully refreshed from Google Patents.
US4092354A
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Process for production of acrylic acid
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1974-03-29
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Granted: 1978-05-30
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Expires: 1994-03-29
Abstract
Abstract A process for production of acrylic acid by the gas phase catalytic oxidation of acrolein with molecular oxygen in the presence of a catalyst, characterized in that the catalyst is a metal oxide catalyst containing as the metal elements Mo, V, Cu and X in a ratio of 12 : 0.1-16 : 0.1-8 : 0.01-12 as the number of atoms (wherein X represents at least one element selected from the group consisting of Fe, Co, Ni and Mg), whereby acrylic acid can be produced at a greatly lowered reaction temperature in a markedly increased yield with an improved perpass yield.
Inventors
- 👤 Tatsuo Shiraishi
- 👤 Susumu Kishiwada
- 👤 Yoshihiko Nagaoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:19
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J23/88; B01J23/887; B01J23/8877; C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/25; C07C51/252; B01J2523/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
79 words
A process for the production of acrylic acid by the gas phase catalytic oxidation of acrolein with molecular oxygen which comprises contacting a gaseous mixture comprising acrolein and molecular oxygen with a catalyst consisting essentially of a metal oxide composition having the formula: Mo.sub.12 V.sub.0.1-16 Cu.sub.0.1-8 X.sub.0.01-12 O.sub.a, wherein X is at least one member selected from the group consisting of Fe, Co and Ni and a is a number determined by the valence requirements of the other atoms.
Claim 2
Dependent Claim
79 words
A process for the production of acrylic acid by the gas phase catalytic oxidation of acrolein with molecular oxygen which comprises contacting a gaseous mixture comprising acrolein and molecular oxygen with a catalyst consisting essentially of a metal oxide composition having the formula: Mo.sub.12 V.sub.0.1-16 Cu.sub.0.1-8 X.sub.0.01-12 O.sub.a, wherein X is at least one member selected from the group consisting of Fe, Co and Ni and a is a number determined by the valence requirements of the other atoms.
Claim 3
Dependent Claim
20 words
The process according to claim 1, wherein the metal oxide composition has the formula: Mo.sub.12 V.sub.0.5-12 Cu.sub.0.2-6 X.sub.0.05-8 O.sub.a .
Claim 4
Dependent Claim
13 words
The process according to claim 1, wherein the gaseous mixture also contains steam.
Claim 5
Dependent Claim
19 words
The process according to claim 3, wherein the gaseous mixture contains from 20 to 70 mol % of steam.
Claim 6
Dependent Claim
19 words
The process according to claim 1, wherein the contact is effected at a temperature of 200° to 400° C.
Claim 7
Dependent Claim
22 words
The process according to claim 1, wherein the contact is effected at a space velocity of 300 to 12,000 hr -1 .
Claim 8
Dependent Claim
17 words
The process according to claim 1, wherein the metal oxide catalyst is supported on an inert carrier.
Claim 9
Dependent Claim
30 words
The process according to claim 7, wherein said carrier is selected from the group consisting of silica sol, silica gel, alumina, alumina silicate, silicon carbide, diatomaceous earth and titanium oxide.
Claim 10
Dependent Claim
26 words
The process according to claim 8, wherein the amount of the carrier is from 5 to 90% by weight based on the weight of the catalyst.
Claim 11
Dependent Claim
25 words
The process according to claim 1, wherein the gaseous mixture comprises acrolein, molecular oxygen and steam in a proportion of 0.5-10:0.5-20:0-90 by mol %, respectively.
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) | 1981-05-29 | 1981-11-28 | 1982-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-29 | 1985-11-28 | 1986-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-29 | 1989-11-28 | 1990-05-30 | $7700.00 | Window Closed / Lapsed |