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Patent US4246195A successfully refreshed from Google Patents.
US4246195A
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US
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Purification of carbonylation products
Assignee: Halcon Research and Development Corp
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Filing: 1978-10-06
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Granted: 1981-01-20
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Expires: 1998-10-06
Abstract
Abstract Carbonylation products of methyl acetate such as acetic anhydride are purified with respect to iodine contaminants by treatment with cesium acetate, potassium acetate or sodium acetate.
Inventors
- 👤 Peter L. Szecsi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:09
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/42; C07C51/487; C07C51/54; C07C51/573
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
92 words
A process for the purification of methyl acetate carbonylation products produced by the reaction of carbon monoxide upon methyl acetate in the presence of a Group VIII noble metal and an iodine moiety, optionally also in the presence of hydrogen, to remove organic iodine contaminants including methyl iodide therefrom which comprises treating said products with a small but effective amount of a treating agent which is cesium acetate, potassium acetate or sodium acetate to form inorganic salts from the iodine in said organic contaminants, and separating said carbonylation products from said salts.
Claim 2
Dependent Claim
92 words
A process for the purification of methyl acetate carbonylation products produced by the reaction of carbon monoxide upon methyl acetate in the presence of a Group VIII noble metal and an iodine moiety, optionally also in the presence of hydrogen, to remove organic iodine contaminants including methyl iodide therefrom which comprises treating said products with a small but effective amount of a treating agent which is cesium acetate, potassium acetate or sodium acetate to form inorganic salts from the iodine in said organic contaminants, and separating said carbonylation products from said salts.
Claim 3
Dependent Claim
21 words
A process as defined in claim 1, wherein said carbonylation products contain less than 1000 ppm of said organic iodine contaminants.
Claim 4
Dependent Claim
30 words
A process as defined in claim 1, wherein said treating agent is used in an amount of at least 1 equivalent per equivalent of total I in the carbonylation products.
Claim 5
Dependent Claim
21 words
A process as defined in claim 1, wherein the quantity of iodine contaminant is reduced to at most about 10 ppm.
References Cited (Backward Citations)
US1986322A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-20 | 1984-07-21 | 1985-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-20 | 1988-07-21 | 1989-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-20 | 1992-07-21 | 1993-01-20 | $7700.00 | Window Closed / Lapsed |