Abstract: A condensed phase process for the preparation of purified 2,3-pentanedione from lactic acid and an alkali metal lactate is described. The process uses elevated temperatures between about 200.degree. to 360.degree. C. for heating a reaction mixture of lactic acid and an alkali metal lactate to produce the 2,3-pentanedione in a reaction vessel. The 2,3-pentanedione produced is vaporized from the reaction vessel and condensed with water.
Type:
Grant
Filed:
April 24, 1997
Date of Patent:
November 3, 1998
Assignee:
Board of Trustees operating Michigan State University
Inventors:
Dennis J. Miller, Scott M. Perry, Paul T. Fanson, James E. Jackson
Abstract: This invention relates to a process for the preparation and fractionation of a mixture of dimethyl ether and chloromethane by extractive distillation with methanol as extractant. The mixture is prepared by reacting methanol with hydrogen chloride. The mixture is then distilled to remove water and is subsequently subjected to an extractive distillation with methanol as extractant, with chloromethane resulting as top product. In another distillation step, the remaining dimethyl ether is separated from the methanol.
Type:
Grant
Filed:
June 23, 1997
Date of Patent:
June 9, 1998
Assignee:
Hoechst Aktiengesellschaft
Inventors:
Peter Roth, Erhard Leistner, Wolfgang Wendel
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