Process for the preparation of .epsilon.-caprolactone

Details Process for the preparation of .epsilon.-caprolactone Process for the preparation of .epsilon.-caprolactone

C - Chemistry, Metallurgy

07

D

202/88, 260/355.

C07D 313/04 (2006.01) C07D 315/00 (2006.01)

Patent

CA 1152519

ABSTRACT OF THE DISCLOSURE A process for the preparation of .epsilon.-caprolactone comprising: a) reacting cyclohexanone with a solution of perpropionic acid in an organic solvent at a molar ratio of cyclohexanone;perpropionic acid of about 1.1-5:1 at a temperature of about 10 to 80°C to form a reaction mixture consisting essentially of .epsilon.-caprolactone, propionic acid and organic solvent, b) distilling the reaction mixture from (a) in a first distillation unit to obtain a distillate comprising the organic solvent and a distillation residue, c) introducing the distillation residue from (b) at a point into a second distillation unit to obtain a distillate comprising propionic acid and unreacted cyclohexanone, removing from the second distillation unit, separately from one another and at a point below the point of intro- duction into the second distillation unit, .epsilon.-caprolactone and any high-boiling constitutents, and, d) distilling in a third distillation unit the distillate from (c) to obtain a distillate con- sisting essentially or propionic acid and a distillation residue comprosing a mixture of propionic acid and cyclohexanone.

352097

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