Process for the preparation of aromatic carboxylic acid esters
AssigneeEastman Kodak Company
InventorGuy R. Steinmetz
Life of this patent
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Abstract
Disclosed is an improved process for the manufacture of aromatic carboxylic acid esters by the carbonylation of aromatic iodides wherein the amount of the corresponding unesterified carboxylic acid in the product obtained from the process is minimized. The process comprises carbonylating an aromatic iodide in the presence of carbon monoxide, a Group VIII metal catalyst, an inorganic adsorbent and an alkanol to co-produce an aromatic carboxylic acid ester and an alkyl iodide.
Claims10
Process for the co-production of an aromatic carboxylic acid ester, containing the corresponding unesterfied aromatic carboxylic acid, and an alkyl iodide which comprises carbonylating an aromatic iodide in the presence of carbon monoxide, a Group VIII metal catalyst selected from the group consisting of palladium, nickel, ruthenium, rhodium and mixtures thereof, an inorganic absorbent and an alkanol at carboxylic acid ester-forming and alkyl iodide-forming conditions of pressure and temperature, wherein the mole ratio of carboxylic acid ester groups to unesterified carboxylic acid groups in the crude product is at least 25.
Process for the co-production of dimethyl 1,3- or 1,4-benzenedicarboxylate, containing the corresponding unesterfied benzenedicarboxylic acid or the mono-ester thereof, and methyl iodide which comprises carbonylating 1,3- or 1,4-diiodobenzene in the presence of carbon monoxide, a palladium catalyst, a 3A or 4A crystalline aluminosilicate zeolite absorbent and methanol at a pressure of about 300 to 1500 psig and a temperature of about 130.degree. to 170.degree. C., wherein the mole ratio of carboxylic acid ester groups to unesterfied carboxylic acid groups is at least 25.
Process for the co-production of dimethyl 2,6- or 2,7-naphthalenedicarboxylate, containing the corresponding unesterified naphthalenedicarboxylic acid or mono-ester thereof, and methyl iodide which comprises carbonylating 2,6- or 2,7-diiodobenzene in the presence of carbon monoxide, a palladium catalyst, a 3A or 4A crystalline aluminosilicate zeolite absorbent and methanol at a pressure of about 300 to 1500 psig and a temperature of about 130.degree. to 170.degree. C. wherein the mole ratio of carboxylic acid ester groups to unesterified carboxylic acid groups is at least 50.
Dependencies are inferred from the claim text.