US3997600A
Expired / Lapsed
US
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Method of preparing acrylic acid
Assignee: Societa Italiana Resine SpA SIR
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Filing: 1974-11-18
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Granted: 1976-12-14
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Expires: 1994-11-18
Abstract
Abstract Acrylic acid is prepared by contacting an oxidation catalyst with a gaseous mixture containing acrolein, oxygen and methanol. A proportion by volume from 0.05 to 0.5% methanol and a molar ratio of acrolein to methanol from 10:1 to 100:1 are maintained in the said mixture the catalyst is defined by one of the general formulae: Mo a V b Me c O x Mo a W d Me c O y Mo a V b W d Me c O z Wherein Me is Cr, Mn, Fe, Co, Ni, Cu, Zn, Ag, Cd, Au, Hg, Na, Ba, Ca, Ce, Bi, Th, U, Pb, Sn, Sb, P or B; and wherein a is a value from 6 to 12, b from 1 to 6, c from 0 to 5, d from 1 to 6, x from 20.5 to 58.5, y from 21 to 61.5 and z from 23.5 to 76.5. The reaction is carried out at a temperature not exceeding 320° C.
Inventors
- 👤 Natale Ferlazzo
- 👤 Gian Fausto Buzzi
- 👤 Marcello Ghirga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:02
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J23/88; B01J23/887; B01J23/16; B01J23/24; B01J23/28; B01J23/30; B01J23/32; B01J23/34; B01J23/38; B01J23/54; B01J23/66; B01J23/68; B01J23/683; B01J27/00; B01J27/14; B01J27/186; C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/25; C07C51/252; B01J2523/00
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
181 words
A method of preparing acrylic acid comprising contacting with an oxidation catalyst at a temperature not exceeding 320° C a gaseous mixture comprising acrolein, oxygen and methanol in a proportion by volume from 0.05 to 0.5% of methanol and a molar ratio of acrolein to methanol from 10:1 to 100:1, and wherein the said catalyst is a calcined metal oxide catalyst chosen from the group of compounds defined by the following formulae: Mo a V b Me c Ox Mo a W d Me c O y Mo a V b W c Me c O z wherein Me is an element chosen from the group consisting of chromium, manganese, iron, cobalt, nickel, copper, zinc, silver, cadmium, gold, mercury, sodium, barium, calcium, cerium, bismuth, thorium, uranium, lead, antimony, tin, phosphorus and boron; and wherein a, b, c, d, x, y, z are numbers varying, respectively: a from 6 to 12, b from 1 to 6, c from 0 to 5, d from 1 to 6, x from 20.5 to 58.5, y from 21 to 61.5 and z from 23.5 to 76.5.
Claim 2
Independent Claim
181 words
A method of preparing acrylic acid comprising contacting with an oxidation catalyst at a temperature not exceeding 320° C a gaseous mixture comprising acrolein, oxygen and methanol in a proportion by volume from 0.05 to 0.5% of methanol and a molar ratio of acrolein to methanol from 10:1 to 100:1, and wherein the said catalyst is a calcined metal oxide catalyst chosen from the group of compounds defined by the following formulae: Mo a V b Me c Ox Mo a W d Me c O y Mo a V b W c Me c O z wherein Me is an element chosen from the group consisting of chromium, manganese, iron, cobalt, nickel, copper, zinc, silver, cadmium, gold, mercury, sodium, barium, calcium, cerium, bismuth, thorium, uranium, lead, antimony, tin, phosphorus and boron; and wherein a, b, c, d, x, y, z are numbers varying, respectively: a from 6 to 12, b from 1 to 6, c from 0 to 5, d from 1 to 6, x from 20.5 to 58.5, y from 21 to 61.5 and z from 23.5 to 76.5.
Claim 3
Dependent Claim
24 words
The method of claim 1, wherein a molar ratio of acrolein to oxygen from 0.1:1 to 4:1 is maintained in the said gaseous mixture.
Claim 4
Dependent Claim
18 words
The method of claim 2, wherein the molar ratio of acrolein to oxygen is from 0.2:1 to 2:1.
Claim 5
Dependent Claim
22 words
The method of claim 1, wherein the gaseous mixture comprises the gases obtained in a catalytic oxidation process of propylene to acrolein.
Claim 6
Dependent Claim
18 words
The method of claim 4, wherein the gaseous mixture consists essentially of the said gases admixed with methanol.
Claim 7
Dependent Claim
20 words
The method of claim 4, wherein the gaseous mixture consists essentially of the said gases admixed with methanol and oxygen.
Claim 8
Dependent Claim
14 words
The method of claim 1, wherein the temperature is from 180° to 320° C.
Claim 9
Dependent Claim
14 words
The method of claim 1, wherein the temperature is from 200° to 280° C.
Claim 10
Dependent Claim
16 words
The method of claim 1, wherein the pressure is from atmospheric pressure up to 5 kg/sq.cm.
Claim 11
Dependent Claim
15 words
The method of claim 1, wherein the contact period is from 0.1 to 40 seconds.
Claim 12
Dependent Claim
15 words
The method of claim 1, wherein the contact period is from 1 to 20 seconds.
Claim 13
Dependent Claim
40 words
The method of claim 1, wherein the gaseous mixture comprises acrolein in a proportion of from 1 to 8 vol % and oxygen in a proportion of from 0.5 to 20 vol %, the remainder consisting substantially of inert gases.
Claim 14
Dependent Claim
59 words
The method of claim 12, wherein a molar ratio of acrolein to oxygen from 0.1:1 to 4:1 is maintained in the said gaseous mixture and the latter is contacted with the catalyst at a temperature from 180° to 320° C, a pressure from atmospheric pressure up to 5 Kg/sq.cm. and during a period of from 0.1 to 40 seconds.
Claim 15
Dependent Claim
21 words
The method of claim 13, wherein the gaseous mixture comprises the gases obtained in the catalytic oxidation of propylene to acrolein.
References Cited (Backward Citations)
US3819685A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-12-14 | 1980-06-14 | 1980-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-14 | 1984-06-14 | 1984-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-14 | 1988-06-14 | 1988-12-14 | $7700.00 | Window Closed / Lapsed |