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US 12,545,633 B2Granted
Method for producing fluorenone
AssigneeMitsubishi Gas Chemical Company, Inc.
InventorsHiroki Sumi, Yuki Watanabe, Hideaki Fujita, Goh Nakamura, Tatsuyuki Kumano
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Abstract
Provided is a method for producing fluorenone comprising an oxidation step of oxidizing fluorene in the presence of an aliphatic carboxylic acid having 2 to 3 carbon atoms, a metal catalyst, a bromine compound, and oxygen, a solvent removal step of removing the aliphatic carboxylic acid, a heating step at 120 to 350° C., and a distillation step in the order indicated.
Claims20
A method for producing fluorenone, comprising:
- oxidizing fluorene in the presence of an aliphatic carboxylic acid having 2 to 3 carbon atoms, a metal catalyst, a bromine compound, and oxygen to obtain an oxidation reaction product;
- removing the aliphatic carboxylic acid from the oxidation reaction product to produce a mixture;
- heating the mixture at a temperature in a range of 120 to 350° C. to obtain a heat-treated mixture;
- and
- a distilling the heat-treated mixture.
2 more elements
Dependencies are inferred from the claim text.