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US 5,710,325 AGranted
Manufacture of adipic acid
AssigneesE. I. Du Pont de Nemours and Company, Dsm N.V.
InventorsHarold Stanley Bruner, Jr., Samuel Livingston Lane, Bruce Edwin Murphree
Life of this patent
Estimating the term…
Abstract
This invention provides a process for the preparation of adipic acid from pentenoic acids or esters of pentenoic acids by hydrocarboxylation of a reaction mixture in which gamma-valerolactone constitutes 30 to 70% by weight of the reaction mixture.
Claims5
A process for the preparation of adipic acid from pentenoic acid or mixtures of pentenoic acid isomers which comprises:
- (a) forming a reaction mixture containing the pentenoic acids or mixtures thereof, water, carbon monoxide, gamma-valerolactone, an iridium catalyst promoted with bromide or iodide and optionally a strong acid reaction promoter wherein the concentration of gamma-valerolactone is from 30 to 70% by weight of the reaction mixture;
- and
- (b) reacting the mixture to convert pentenoic acid to adipic acid and branched six carbon dicarboxylic isomers of adipic acid.
Dependencies are inferred from the claim text.