Patent US2339378A successfully refreshed from Google Patents.
Patent US5883295A successfully refreshed from Google Patents.
US5883295A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Iridium catalyzed carbonylation process for the production of acetic acid
Assignee: BP Chemicals Ltd
•
Filing: 1997-12-17
•
Granted: 1999-03-16
•
Expires: 2017-12-17
Abstract
Abstract A process for the production of acetic acid comprising carbonylating with carbon monoxide methanol and/or a reactive derivative thereof in the substantial absence of a metal promoter and/or ionic iodide co-promoter in a carbonylation reactor containing a liquid reaction composition comprising an iridium carbonylation catalyst, methyl iodide co-catalyst, water, acetic acid and methyl acetate wherein there is maintained (i) in the liquid reaction composition: (a) water at a concentration of less than 5.0% by weight and (b) methyl iodide at a concentration greater than 12% by weight and (ii) in the carbonylation reactor a total pressure of less than 50 barg.
Inventors
- 👤 John G. Sunley
- 👤 Robert J Watt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:11
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/10; C07C51/12
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
103 words
A process for the production of acetic acid comprising carbonylating with carbon monoxide methanol and/or a reactive derivative thereof in the substantial absence of a metal promoter and/or ionic iodide co-promoter in a carbonylation reactor containing a liquid reaction composition comprising an iridium carbonylation catalyst, methyl iodide co-catalyst, water, acetic acid and methyl acetate characterized in that there is maintained (i) in the liquid reaction composition: (a) water at a concentration of less than 5.0% by weight and (b) methyl iodide at a concentration greater than 12% by weight and (ii) in the carbonylation reactor a total pressure of less than 50 barg.
Claim 2
Dependent Claim
103 words
A process for the production of acetic acid comprising carbonylating with carbon monoxide methanol and/or a reactive derivative thereof in the substantial absence of a metal promoter and/or ionic iodide co-promoter in a carbonylation reactor containing a liquid reaction composition comprising an iridium carbonylation catalyst, methyl iodide co-catalyst, water, acetic acid and methyl acetate characterized in that there is maintained (i) in the liquid reaction composition: (a) water at a concentration of less than 5.0% by weight and (b) methyl iodide at a concentration greater than 12% by weight and (ii) in the carbonylation reactor a total pressure of less than 50 barg.
Claim 3
Dependent Claim
13 words
A process according to claim 1 wherein methanol and/or methyl acetate are carbonylated.
Claim 4
Dependent Claim
27 words
A process according to claim 1 wherein the concentration of methyl acetate in the liquid reaction composition is in the range from 1 to 50% by weight.
Claim 5
Dependent Claim
27 words
A process according to claim 3 wherein the concentration of methyl acetate in the liquid reaction composition is in the range from 10 to 40% by weight.
Claim 6
Dependent Claim
22 words
A process according to claim 1 wherein the methyl iodide concentration in the liquid reaction composition is greater than 14% by weight.
Claim 7
Dependent Claim
19 words
A process according to claim 5 wherein the upper limit of the methyl iodide concentration is 20% by weight.
Claim 8
Dependent Claim
21 words
A process according to claim 1 wherein the water concentration in the liquid reaction composition is less than 4% by weight.
Claim 9
Dependent Claim
30 words
A process according to claim 1 wherein the concentration of the iridium catalyst in the liquid reaction composition is in the range from 400 to 5000 ppm measured as iridium.
Claim 10
Dependent Claim
21 words
A process according to claim 8 wherein the concentration of iridium catalyst is from 500 to 3000 ppm measured as iridium.
Claim 11
Dependent Claim
19 words
A process according to claim 1 wherein the total pressure in the carbonylation reactor is less than 40 barg.
Claim 12
Dependent Claim
15 words
A process according to claim 10 wherein the total pressure is less than 30 barg.
Claim 13
Dependent Claim
24 words
A process according to claim 1 wherein the temperature at which the process is operated is in the range from 150° to 220° C.
Claim 14
Dependent Claim
22 words
A process according to claim 1 wherein the amount of hydrogen in the carbon monoxide reactant is less than 0.3 mol %.
Claim 15
Dependent Claim
21 words
A process according to claim 1 wherein the partial pressure of hydrogen in the carbonylation reactor is less than 0.3 bar.
Claim 16
Dependent Claim
88 words
A process according to claim 1 wherein the liquid reaction composition comprises: from 1 to 5% by weight water, from 14 to 18% by weight methyl iodide, from 14 to 31% by weight methyl acetate, from 400 to 3000 ppm iridium catalyst measured as iridium, and the balance comprising substantially acetic acid, and the reaction conditions are a carbonylation reaction temperature of 185° to 200° C., a carbonylation reaction total pressure of up to 40 barg and a carbon monoxide partial pressure of from 1 to 12 bar.
Claim 17
Dependent Claim
9 words
A process according to claim 1 when operated continuously.
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) | 2002-03-15 | 2002-09-14 | 2003-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-03-15 | 2006-09-14 | 2007-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-03-15 | 2010-09-14 | 2011-03-16 | $7700.00 | Window Closed / Lapsed |