Process for the preparation of adipic acid or pentenoic acid
AssigneeE. I. Du Pont de Nemours and Company
InventorsErdem M. Atadan, Harold S. Bruner, Jr.
Life of this patent
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Abstract
Six carbon diacids or lactones or 5 carbon lactones or 6 carbon diacid anhydrides or branched mono-olefinic five carbon acids are converted (isomerized) to adipic acid or pentenoic acids by reacting them is the presence of carbon monoxide and a iodide promoted iridium catalyst.
Claims7
A process for the preparation of adipic acid and/or pentenoic acids which comprises (1) forming a reaction mixture containing (a) one or more acids or lactones selected from saturated branched six carbon diacids, saturated five carbon lactones, saturated six carbon diacid anhydrides and branched mono-olefinic five carbon monoacids (b) carbon monoxide, and (c) an iodide promoted iridium catalyst (2) heating said reaction mixture to a temperature in the range of about 175 degrees C. to about 230 degrees C. while under a carbon monoxide pressure of between 0 to 2000 psi absolute and where the ratio of active iodide to iridium in the reaction mixture is 0.5:1 to 20:1, and the iridium content of the reaction mixture is about 100 to 8,000 parts per million by weight of the reaction mixture.
Dependencies are inferred from the claim text.