EP0752406A1
Expired / Lapsed
EP
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Process for the production of acetic acid by carbonylation
Assignee: BP Chemicals Ltd
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Filing: 1996-04-18
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Granted: —
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Expires: 2016-04-18
Abstract
Abstract In a process for the production of acetic acid by carbonylation of methanol and/or its reactive derivative in the liquid phase in the presence of an iridium carbonylation catalyst, a methyl iodide co-catalyst and a promoter, the beneficial effect of the promoter is enhanced by continuously maintaining in the liquid reaction composition, no greater than 6.5 % by weight water, 1 to 35 % by weight methyl acetate and 4 to 20 % by weight methyl iodide.
Inventors
- 👤 Michael James Res. Centre Warrensville Baker
- 👤 Martin Francis Giles
- 👤 Carl Sherman Garland
- 👤 Michael James Muskett
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 13:47
CPC Classifications
C; C07; C07C; C07C53/00; C07C53/08; C07C51/00; C07C51/10; C07C51/12; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/582
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
146 words
A process for the production of acetic acid comprising (1) continuously feeding methanol and/or a reactive derivative thereof and carbon monoxide to a carbonylation reactor which contains a liquid reaction composition comprising an iridium carbonylation catalyst, methyl iodide co-catalyst, a finite concentration of water, acetic acid, methyl acetate and at least one promoter; (2) contacting the methanol and/or reactive derivative thereof with the carbon monoxide in the liquid reaction composition to produce acetic acid; and (3) recovering acetic acid from the liquid reaction composition characterised in that there is continuously maintained in the liquid reaction composition throughout the course of the reaction (a) water at a concentration of no greater than 6.5 % by weight, (b) methyl acetate at a concentration in the range 1 to 35 % by weight and (c) methyl iodide at a concentration in the range 4 to 20 % by weight.
Claim 2
Dependent Claim
36 words
A process as claimed in claim 1 in which there is continuously maintained in the liquid reaction composition throughout the course of the reaction, water at a concentration of no greater than 6 % by weight.
Claim 3
Dependent Claim
38 words
A process as claimed in claim 1 or claim 2 in which there is continuously maintained in the liquid reaction composition throughout the course of the reaction, water at a concentration of at least 0.1 % by weight.
Claim 4
Dependent Claim
35 words
A process as claimed in claim 3 in which there is continuously maintained in the liquid reaction composition throughout the course of the reaction, water at a concentration of at least 1 % by weight.
Claim 5
Dependent Claim
42 words
A process as claimed in any one of the preceding claims in which there is continuously maintained in the liquid reaction composition throughout the course of the reaction, methyl acetate at a concentration in the range 1 to 30 % by weight.
Claim 6
Dependent Claim
38 words
A process as claimed in claim 5 in which there is continuously maintained in the liquid reaction composition throughout the course of the reaction, methyl acetate at a concentration in the range 5 to 25 % by weight.
Claim 7
Dependent Claim
42 words
A process as claimed in any one of the preceding claims in which there is continuously maintained in the liquid reaction composition throughout the course of the reaction, methyl iodide at a concentration in the range 5 to 16 % by weight.
Claim 8
Dependent Claim
44 words
A process as claimed in any one of the preceding claims in which the at least one promoter is selected from the group consisting of ruthenium, osmium, rhenium, cadmium, mercury, zinc, gallium, indium and tungsten, preferably from the group consisting of ruthenium and osmium.
Claim 9
Dependent Claim
22 words
A process as claimed in claim 8 in which the molar ratio of promoter : iridium is [0.5 to 15] : 1.
Claim 10
Dependent Claim
67 words
A process as claimed in claim 1 in which there is continuously maintained in the liquid reaction composition throughout the course of the reaction about 5 % by weight water, about 7 % by weight methyl iodide, about 15 % methyl acetate, iridium catalyst at a concentration in the range 400 to 3000 ppm and ruthenium promoter at a concentration in the range 400 to 4000 ppm.
References Cited (Backward Citations)
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