US5877347A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Iridium catalyzed carbonylation process for the production of acetic acid
Assignee: BP Chemicals Ltd
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Filing: 1997-12-17
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Granted: 1999-03-02
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Expires: 2017-12-17
Abstract
Abstract A process for the production of acetic acid comprises (1) continuously feeding methanol and/or a reactive derivative thereof and carbon monoxide to a carbonylation reactor containing a liquid reaction composition comprising an iridium carbonylation catalyst, methyl iodide co-catalyst, a finite concentration of water, acetic acid, methyl acetate and, optionally at least one promoter, (2) carbonylating 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, there being continuously maintained (a) in the liquid reaction composition water at a concentration of no greater than 4.5% by weight, and (b) in the reactor a carbon monoxide partial pressure in the range from greater than 0 to 7.5 bar.
Inventors
- 👤 Evert Jan Ditzel
- 👤 John Glenn Sunley
- 👤 Robert John Watt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:14
CPC Classifications
C; C07; C07C; C07C53/00; C07C53/08; C07C51/00; C07C51/10; C07C51/12
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
126 words
Process for the production of acetic acid which process comprises (1) continuously feeding methanol and/or a reactive derivative thereof and carbon monoxide to a carbonylation reactor containing a liquid reaction composition comprising an iridium carbonylation catalyst, methyl iodide co-catalyst, a finite concentration of water, acetic acid, methyl acetate and, optionally at least one promoter; (2) carbonylating 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, there being continuously maintained (a) in the liquid reaction composition water at a concentration of no greater than 4.5% by weight, and (b) in the reactor a carbon monoxide partial pressure in the range from greater than 0 to 7.5 bar.
Claim 2
Dependent Claim
126 words
Process for the production of acetic acid which process comprises (1) continuously feeding methanol and/or a reactive derivative thereof and carbon monoxide to a carbonylation reactor containing a liquid reaction composition comprising an iridium carbonylation catalyst, methyl iodide co-catalyst, a finite concentration of water, acetic acid, methyl acetate and, optionally at least one promoter; (2) carbonylating 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, there being continuously maintained (a) in the liquid reaction composition water at a concentration of no greater than 4.5% by weight, and (b) in the reactor a carbon monoxide partial pressure in the range from greater than 0 to 7.5 bar.
Claim 3
Dependent Claim
34 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 a water concentration of no greater than 3% by weight.
Claim 4
Dependent Claim
33 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 a water concentration of at least 0.1% by weight.
Claim 5
Dependent Claim
33 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 a water concentration of at least 0.5% by weight.
Claim 6
Dependent Claim
37 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 methyl acetate at a concentration in the range 2 to 50% by weight.
Claim 7
Dependent Claim
37 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 50% by weight.
Claim 8
Dependent Claim
37 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 40% by weight.
Claim 9
Dependent Claim
37 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 10 to 40% by weight.
Claim 10
Dependent Claim
37 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 methyl iodide at a concentration in the range 4 to 16% by weight.
Claim 11
Dependent Claim
29 words
A process as claimed in claim 1 wherein the iridium carbonylation catalyst is present in the liquid reaction composition at a concentration in the range 400 to 5000 ppm.
Claim 12
Dependent Claim
29 words
A process as claimed in claim 1 wherein the iridium carbonylation catalyst is present in the liquid reaction composition at a concentration in the range 700 to 3000 ppm.
Claim 13
Dependent Claim
26 words
A process as claimed in claim 1 in which the at least one promoter is selected from the group consisting of ruthenium, osmium, rhenium, and tungsten.
Claim 14
Dependent Claim
18 words
A process as claimed in claim 11 in which the molar ratio of promoter:iridium is 0.5:1 to 15:1.
Claim 15
Dependent Claim
34 words
A process as claimed in claim 1 in which there is continuously maintained in the reactor throughout the course of the reaction a carbon monoxide partial pressure in the range 0.6 to 7.5 bar.
Claim 16
Dependent Claim
31 words
A process as claimed in claim 1 in which there is continuously maintained in the reactor throughout the course of the reaction a hydrogen partial pressure of less than 0.3 bar.
Claim 17
Dependent Claim
77 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 0.5 to 2.5% by weight water, about 8% by weight methyl iodide co-catalyst, about 15% methyl acetate, iridium catalyst at a cencentration in the range 400 to 3000 ppm, ruthenium promoter at a concentration in the range 400 to 4000 ppm and the balance of the reaction composition comprising substantially acetic acid.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-03-01 | 2002-08-31 | 2003-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-03-01 | 2006-08-31 | 2007-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-03-01 | 2010-08-31 | 2011-03-02 | $7700.00 | Window Closed / Lapsed |