GB730519A - Improvements in the production of acetic anhydride - Google Patents
Improvements in the production of acetic anhydrideInfo
- Publication number
- GB730519A GB730519A GB17336/53A GB1733653A GB730519A GB 730519 A GB730519 A GB 730519A GB 17336/53 A GB17336/53 A GB 17336/53A GB 1733653 A GB1733653 A GB 1733653A GB 730519 A GB730519 A GB 730519A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cobalt
- iodide
- catalyst
- mixture
- carbon monoxide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/54—Preparation of carboxylic acid anhydrides
- C07C51/56—Preparation of carboxylic acid anhydrides from organic acids, their salts, their esters or their halides, e.g. by carboxylation
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
Abstract
Acetic anhydride is obtained by treating dimethyl ether or methyl acetate with carbon monoxide under a pressure exceeding 200 atmospheres, e.g. between 400 and 800 atmospheres and at a temperature between 100 DEG and 250 DEG C. in an anhydrous liquid medium containing as catalyst cobalt bromide or iodide or a mixture thereof. Instead of using cobalt bromide or iodide as catalyst there may be used a mixture of cobalt metal or a cobalt compound with bromine or iodine or with a bromine or iodine compound such as an alkyl bromide or iodide. It is preferred to carry out the reaction in the presence of a solvent for the catalyst. Specified solvents are the lower N-alkylated pyrrolidones, particularly N-methyl pyrrolidone, acetic acid and acetic anhydride. The process may be carried out batchwise or continuously and it is not necessary to carry out the reaction to completion since the unchanged starting material may be used again in the reaction and the catalyst recovered may also be used again without further treatment. The carbon monoxide may be used in concentrated form or mixtures of carbon monoxide and hydrogen containing at least 60 per cent by volume of carbon monoxide may be used. Examples are given in which methyl acetate is converted using (1) cobalt iodide, and (2) a mixture of cobalt bromide and ethyl iodide respectively as catalyst and an example is also given in which dimethyl ether is converted in the presence of a mixture of cobalt bromide and ethyl iodide as catalyst. In each case the carbon monoxide used contains a minor amount of hydrogen and the reaction is carried out in the presence of a solvent which in the case of (1) is either N-methyl pyrrolidone or acetic anhydride and in the case of (2) is N-methyl pyrrolidone. In the example using dimethyl ether as starting material the solvent is N-methyl pyrrolidone, acetic anhydride, or acetic acid.ALSO:Catalysts for the production of acetic anhydride by treating dimethyl ether or methyl acetate with carbon monoxide at elevated temperature and pressure in an anhydrous liquid medium (see Group IV (b)) comprise either cobalt bromide or iodide or a mixture thereof or a mixture of cobalt metal or a cobalt compound with bromine or iodine or with a bromine or iodine compound such as an alkyl bromide or iodide. Examples include the use of a mixture of cobalt bromide and ethyl iodide as catalyst.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE730519X | 1952-06-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB730519A true GB730519A (en) | 1955-05-25 |
Family
ID=6636778
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB17336/53A Expired GB730519A (en) | 1952-06-28 | 1953-06-23 | Improvements in the production of acetic anhydride |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB730519A (en) |
-
1953
- 1953-06-23 GB GB17336/53A patent/GB730519A/en not_active Expired
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