Carbonylation process
AssigneeEastman Chemical Company
InventorsJoseph Robert Zoeller, Mary Kathleen Moore, Andrew James Vetter
Life of this patent
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Abstract
Disclosed is a carbonylation process for the production of carboxylic acids, carboxylic acid esters and/or carboxylic acid anhydrides wherein a carbonylation feedstock compound selected from one or more organic oxygenates such as alcohols, ethers, and esters is contacted with carbon monoxide in the presence of a carbonylation catalyst and one or more onium compounds. The carbonylation process differs from known carbonylation processes in that a halide compound such as a hydrogen halide, typically hydrogen iodide, and/or alkyl halide, typically methyl iodide, extraneous or exogenous to the carbonylation process is not fed or supplied separately to the process.
Claims18
Carbonylation process for the production of a carbonylation product selected from carboxylic acids, carboxylic acid esters, carboxylic acid anhydrides, and a mixture of any two or more thereof which comprises combining in a reaction zone a carbonylation feedstock compound selected from alkanols, dialkyl ethers, carboxylic acid esters, and a mixture of any two or more thereof:
- a Group VIII metal carbonylation catalyst comprising rhodium, iridium, or a compound thereof;
- an onium salt compound comprising a 1,3-dialkylimidazolium iodide or an N-alkylpyridinium iodide;
- and carbon monoxide under carbonylation conditions of pressure and temperature, wherein neither hydrogen iodide nor an alkyl iodide exogenous or extraneous to the carbonylation process is added or supplied to the reaction zone.
Carbonylation process for the production of a carbonylation product selected from carboxylic acids, carboxylic acid esters, carboxylic acid anhydrides, and a mixture of any two or more thereof which comprises the steps of:
- (i) feeding to a reaction zone a carbonylation feedstock compound selected from alkanols, dialkyl ethers, carboxylic acid esters, and a mixture of any two or more thereof:
- a Group VIII metal carbonylation catalyst comprising rhodium, iridium, or a compound thereof, dissolved in an inert solvent;
- an onium salt compound comprising a 1,3-dialkyl-imidazolium iodide or an N-alkylpyridinium iodide and;
- optionally, an inert solvent to provide a homogeneous reaction zone liquid and feeding carbon monoxide to the homogeneous reaction zone liquid under carbonylation conditions of pressure and temperature;
- and
- (ii) removing from the reaction zone a crude liquid product comprising carbonylation product, carbonylation feedstock compound, Group VIII metal carbonylation catalyst, onium salt compound, inert solvent and carbon monoxide;
- wherein neither hydrogen iodide nor an alkyl iodide exogenous or extraneous to the carbonylation process is added to the reaction zone.
Carbonylation process for the production of a carbonylation product selected from carboxylic acids, carboxylic acid esters, carboxylic acid anhydrides, and a mixture of any two or more thereof which comprises the steps of:
- (i) feeding a carbonylation feedstock compound selected from alkanols, dialkyl ethers, carboxylic acid esters, and a mixture of any two or more thereof and carbon monoxide to a reaction zone containing a solution comprising a Group VIII metal carbonylation catalyst comprising rhodium, iridium, or a compound thereof, and an onium salt compound comprising a 1,3-dialkylimidazolium iodide or an N-alkylpyridinium iodide to provide a homogeneous reaction zone liquid maintained under carbonylation conditions of pressure and temperature wherein the temperature of the reaction zone is maintained above the dew point of the carbonylation product;
- and
- (ii) removing from the reaction zone a crude gaseous product comprising the carbonylation product, carbonylation feedstock compound and carbon monoxide;
- wherein neither hydrogen iodide nor an alkyl iodide exogenous or extraneous to the carbonylation process is added to the reaction zone.
Carbonylation process for the production of a carbonylation product selected from carboxylic acids, carboxylic acid esters, carboxylic acid anhydrides, and a mixture of any two or more thereof which comprises comprising the steps of:
- (i) feeding gaseous carbonylation feedstock compound selected from alkanols, dialkyl ethers, carboxylic acid esters, and a mixture of any two or more thereof and carbon monoxide to a reaction zone containing a heterogeneous, solid Group VIII metal carbonylation catalyst comprising rhodium, iridium, or a compound thereof;
- and a heterogeneous onium salt compound comprising (1) a 1,3-dialkylimidazolium iodide or an N-alkylpyridinium iodide deposited on a catalyst support or (2) a polymeric material containing quaternary nitrogen groups wherein the reaction zone is maintained under carbonylation conditions of pressure and temperature wherein the temperature of the reaction zone is maintained above the dew point of the carbonylation product;
- and
- (ii) removing from the reaction zone a gaseous product comprising the carbonylation product, carbonylation feedstock compound and carbon monoxide,
- wherein neither hydrogen iodide nor an alkyl iodide exogenous or extraneous to the carbonylation process is added to the reaction zone.
Dependencies are inferred from the claim text.