Production of dicarboxylic acids
AssigneeMonsanto Company
InventorsFrank E. Paulik, Arnold Hershman, Walter R. Knox, James F. Roth
Life of this patent
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Abstract
The present invention relates to a process for the preparation of dicarboxylic acids, specifically by the reaction of non-vicinal glycols; halogen containing derivatives in which the OH radical of the glycol is substituted by Cl, Br, or I; ester derivatives of glycols; and cyclic ether derivatives of glycols; with carbon monoxide in the presence of catalyst compositions essentially comprising rhodium or iridium compounds and complexes, together with a halide promoter.
Claims21
A process for the carbonylation of reactants selected from the group consisting of tetrahydrofuran and non-vicinal acyclic glycols wherein the hydroxyl groups are on different carbon atoms and there are from 3 to 20 carbon atoms in the glycol, said process comprising contacting
- 1. at least one of said reactants,
- 2. carbon monoxide, and
- 3. a catalyst system consisting essentially of
- a. a metal compound selected from the group consisting of rhodium compounds, and iridium compounds and
- b. a halogen component which is bromine, iodine, a bromide compound or an iodide compound, wherein during said contacting, said metal compound and said halogen component are present in an amount sufficient to catalyze the carbonylation of said reactants, said contacting being carried out at a temperature in the range of 125.degree. C to 250.degree. C.
Dependencies are inferred from the claim text.