US5169982A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for separating iodine and its compounds from the products obtained on subjecting dimethylether, methyl acetate or methanol to carbonylation
Assignee: Hoechst AG
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Filing: 1986-09-16
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Granted: 1992-12-08
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Expires: 2006-09-16
Abstract
Abstract Iodine and its compounds are separated from the carbonylation products acetic acid, acetic anhydride or ethylidene diacetate obtained on subjecting dimethylether, methyl acetate or methanol to a carbonylation reaction in the presence of an iodine-containing catalyst. The quantity of total iodine contaminating the carbonylation products is reduced to less than 20 ppb iodine by treating the products at 20°-200° C. with peracetic acid, diacetyl peroxide or a compound yielding these two agents under the reaction conditions, and separating them distillatively.
Inventors
- 👤 Erpenbach Heinz
- 👤 Klaus Gehrmann
- 👤 Peter Horstermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:31
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/42; C07C51/487; C07C51/54; C07C51/573
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
80 words
A process for separating iodine and its compounds from the carbonylation products acetic acid, acetic anhydride or ethylidene diacetate obtained on subjecting dimethylether, methyl acetate or methanol to a carbonylation reaction in the presence of an iodine-containing catalyst which comprises reducing the quantity of total iodine contaminating the carbonylation products to less than 20 ppb in a single stage by admixing peracetic acid or diacetyl peroxide with these carbonylation products at 20°-200° C. and separating the resulting mixture by distillation.
Claim 2
Dependent Claim
80 words
A process for separating iodine and its compounds from the carbonylation products acetic acid, acetic anhydride or ethylidene diacetate obtained on subjecting dimethylether, methyl acetate or methanol to a carbonylation reaction in the presence of an iodine-containing catalyst which comprises reducing the quantity of total iodine contaminating the carbonylation products to less than 20 ppb in a single stage by admixing peracetic acid or diacetyl peroxide with these carbonylation products at 20°-200° C. and separating the resulting mixture by distillation.
Claim 3
Dependent Claim
22 words
A process as claimed in claim 1, wherein carbonylation products containing less than 100 ppm total iodine are used as feed material.
Claim 4
Dependent Claim
22 words
A process as claimed in claim 1, wherein the carbonylation products are treated at 100°-140° C. over a period of 0.5-120 minutes.
Claim 5
Dependent Claim
24 words
A process as claimed in claim 1, wherein the carbonylation products, after admixture with peracetic acid or diacetyl peroxide are subjected to fractional distillation.
Claim 6
Dependent Claim
21 words
A process as claimed in claim 1, wherein the carbonylation products are admixed with peracetic acid dissolved in glacial acetic acid.
Claim 7
Dependent Claim
17 words
A process as claimed in claim 1, wherein the carbonylation products are admixed with anhydrous peracetic acid.
Claim 8
Dependent Claim
24 words
A process as claimed in claim 1, wherein the contaminated carbonylation products are essentially freed of iodine content without the use of an adsorbent.
Claim 9
Dependent Claim
78 words
A process for separating iodine and its compounds from the carbonylation products acetic acid, acetic anhydride or ethylidene diacetate obtained on subjecting dimethylether, methyl acetate or methanol to a carbonylation reaction in the presence of an iodine-containing catalyst which comprises reducing the quantity of total iodine contaminating the carbonylation products to less than 20 ppb in a single stage by admixing anhydrous peracetic acid with the carbonylation products at 20°-200° C. and separating the resulting mixture by distillation.
Claim 10
Dependent Claim
78 words
A process for separating iodine and its compounds from the carbonylation products acetic acid, acetic anhydride or ethylidene diacetate obtained on subjecting dimethylether, methyl acetate or methanol to a carbonylation reaction in the presence of an iodine-containing catalyst which comprises reducing the quantity of total iodine contaminating the carbonylation products to less than 20 ppb in a single stage by admixing anhydrous peracetic acid with the carbonylation products at 20°-200° C. and separating the resulting mixture by distillation.
Claim 11
Dependent Claim
24 words
A process as claimed in claim 8, wherein the contaminated carbonylation products are essentially freed of iodine content without the use of an adsorbent.
References Cited (Backward Citations)
EP0013551A1
Cited
GB2112394A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-12-08 | 1996-06-08 | 1996-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-12-08 | 2000-06-08 | 2000-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-12-08 | 2004-06-08 | 2004-12-08 | $7700.00 | Window Closed / Lapsed |