Process for the preparation of 2,3-pentanedione

Details Process for the preparation of 2,3-pentanedione Process for the preparation of 2,3-pentanedione

1995-10-25

1998-03-24

Shaver, Paul F.

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

C07C 4500

Patent

active

057314713

ABSTRACT:
A process for the preparation of purified 2,3-pentanedione from lactic compound which is lactic acid or a lactic acid ester. The process uses elevated temperatures between about 250.degree. to 370.degree. C. for heating a support (catalyst 16) and pressures between about 0.1 to 10 MPa to produce the 2,3-pentanedione in a reaction mixture. The lactic compound is converted primarily to 2,3-pentanedione, acrylic acid, and acetaldehyde at the elevated temperatures over the catalyst. The 2,3-pentanedione is preferably separated from the reaction mixture as an azeotrope with water at about 80.degree. to 90.degree. C. and then cooled to separate the 2,3-pentanedione from the water.

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