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US 12,528,757 B2Granted
Method for producing adipic acid
AssigneeToray Industries, Inc.
InventorsDaijiro Tsukamoto, Kenji Kawamura, Katsushige Yamada, Masato Akahira, Daisuke Yamamoto
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Abstract
The present invention relates to a method of producing adipic acid, including a step (hydrogenation step) of reacting 3-hydroxyadipic acid-3,6-lactone with hydrogen in an aqueous solvent in a presence of a hydrogenation catalyst. The hydrogenation catalyst preferably includes one kind or two or more kinds of transition metal elements selected from the group consisting of palladium, platinum, ruthenium, rhodium, rhenium, nickel, cobalt, iron, iridium, osmium, copper, and chromium.
Claims9
A method of producing adipic acid, comprising:
- condensing 3-hydroxyadipic acid in water to obtain a 3-hydroxyadipic acid-3,6-lactone aqueous solution;
- purifying the 3-hydroxyadipic acid-3,6-lactone aqueous solution to obtain a raw material comprising 3-hydroxyadipic acid-3,6-lactone as a main component;
- hydrogenating the raw material with hydrogen in an aqueous solvent in a presence of a hydrogenation catalyst to obtain an adipic acid-containing aqueous solution;
- and
- separating adipic acid from the adipic acid-containing aqueous solution.
2 more elements
Dependencies are inferred from the claim text.