US4014925A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing methyl acrylate or mixtures of methyl acrylate and acrylic acid
Assignee: Societa Italiana Resine SpA SIR
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Filing: 1974-11-05
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Granted: 1977-03-29
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Expires: 1994-11-05
Abstract
Abstract Methyl acrylate or a mixture of methyl acrylate with acrylic acid are prepared by passing through a fluidized bed of catalyst a gaseous mixture comprising acrolein, methanol and oxygen fed at the bottom of the catalytic bed. A further amount of methanol is fed at one intermediate point at least, between the top and bottom of the catalytic bed. 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, Sb, Sn, 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.
Inventors
- 👤 Natale Ferlazzo
- 👤 Gian Fausto Buzzi
- 👤 Marcello Ghirga
- 👤 Benedetto Calcagno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:00
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/25; C07C51/252; B; B01; B01J; B01J23/00; B01J23/16; B01J23/24; B01J23/28; B01J23/30; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J23/88; B01J23/887; B01J23/8876; B01J23/8877; C07C45/00; C07C45/27; C07C45/32; C07C45/33; C07C45/34; C07C45/35; C07C67/00; C07C67/39; B01J2523/00
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
197 words
A method for preparing methyl acrylate or a mixture of methyl acrylate and acrylic acid by contacting acrolein, methnol and oxygen with a catalyst, which comprises continuously delivering said methanol in part at the bottom of a bed of the fluidized catalyst as a gaseous mixture with a gaseous flow comprising said acrolein and oxygen and in part at at least one intermediate point between the top and bottom of the fluidized catalyst bed, said catalyst being selected from the group consisting of compounds defined by the following 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 an element selected 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 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
197 words
A method for preparing methyl acrylate or a mixture of methyl acrylate and acrylic acid by contacting acrolein, methnol and oxygen with a catalyst, which comprises continuously delivering said methanol in part at the bottom of a bed of the fluidized catalyst as a gaseous mixture with a gaseous flow comprising said acrolein and oxygen and in part at at least one intermediate point between the top and bottom of the fluidized catalyst bed, said catalyst being selected from the group consisting of compounds defined by the following 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 an element selected 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 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
26 words
The method of claim 1, wherein the catalyst is supported on silica present in a proportion from 10 to 80% by weight in the supported catalyst.
Claim 4
Dependent Claim
38 words
The method of claim 1, wherein said gaseous flow comprises from 1 to 8 vol % acrolein and from 0.5 to 10 vol. % oxygen, with the molar ratio of acrolein to oxygen being from 0.1:1 to 4:1.
Claim 5
Dependent Claim
25 words
The method of claim 1, wherein the methanol is fed in a total proportion of from 0.2 to 5 moles for each mole of acrolein.
Claim 6
Dependent Claim
31 words
The method of claim 1, wherein the methanol is fed at the bottom of the catalyst bed in a proportion not exceeding 30% by weight of the total quantity of methanol.
Claim 7
Dependent Claim
31 words
The method of claim 1, wherein the methanol is fed at the bottom of the catalyst bed in a proportion not exceeding 20% by weight of the total quantity of methanol.
Claim 8
Dependent Claim
14 words
The method of claim 1, wherein said intermediate points are not more than five.
Claim 9
Dependent Claim
14 words
The method of claim 1, wherein said intermediate points are not more than three.
Claim 10
Dependent Claim
24 words
The method of claim 1, wherein the temperature is from 180° to 320° C and the contact period is from 0.1 to 40 seconds.
Claim 11
Dependent Claim
24 words
The method of claim 1, wherein the temperature is from 220° to 280° C and the contact period is from 1 to 20 seconds.
Claim 12
Dependent Claim
21 words
The method of claim 1, wherein said gaseous flow comprises the gases obtained in the catalytic oxidation of propylene to acrolein.
Claim 13
Dependent Claim
27 words
The method of claim 1, wherein said gaseous flow consists essentially of the gases obtained in the catalyst oxidation of propylene to acrolein and admixed with oxygen.
Claim 14
Dependent Claim
84 words
The method of claim 3, wherein the methanol is fed in a total proportion of from 0.2 to 5 moles for each mole of acrolein, with the proportion of methanol fed at the bottom of the catalyst bed not exceeding 20% by weight of the total quantity of methanol and the remainder of the methanol being fed at not more than five intermediate points, and with the temperature being from 180° to 320° C and the contact period being from 0.1 to 40 seconds.
Claim 15
Dependent Claim
21 words
The method of claim 13, wherein said gaseous flow comprises the gases obtained in the catalytic oxidation of propylene to acrolein.
Claim 16
Dependent Claim
31 words
The method of claim 1, wherein said gaseous flow consists essentially of the gases obtained in the catalytic oxidation of propylene to acrolein and admixed with at least one inert gas.
Claim 17
Dependent Claim
33 words
The method of claim 1, wherein said gaseous flow consists essentially of the gases obtained in the catalytic oxidation of propylene to acrolein and admixed with oxygen and at least one inert gas.
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) | 1980-03-28 | 1980-09-27 | 1981-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-28 | 1984-09-27 | 1985-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-28 | 1988-09-27 | 1989-03-29 | $7700.00 | Window Closed / Lapsed |