Process for producing epsilon-caprolactone

Details Process for producing epsilon-caprolactone Process for producing epsilon-caprolactone

2005-08-30

2005-08-30

Dentz, Bernard (Department: 1625)

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C203S077000, C203S081000, C203S082000, C203S086000

Reexamination Certificate

active

06936724

ABSTRACT:
A process produces ε-caprolactone by the oxidation of cyclohexanone by feeding a crude reaction mixture to a first distillation column; distilling off a first distillate containing low boiling components including unreacted cyclohexanone from the top of the first distillation column; recovering a first side-cut fraction containing unreacted cyclohexanone in a higher concentration than in the first distillate from an intermediate tray; recovering a first bottom liquid containing high boiling components including ε-caprolactone from the bottom; introducing the first side-cut fraction to a second distillation column; recovering a second bottom liquid containing unreacted cyclohexanone from the bottom of the second distillation column; recycling the second bottom liquid into the raw material cyclohexanone; introducing the first bottom liquid to a third distillation column to thereby yield a third distillate containing ε-caprolactone from the third distillation column.

REFERENCES:
patent: 4341709 (1982-07-01), Hofen et al.
patent: 0 972 771 (2000-01-01), None
patent: 53-34789 (1978-03-01), None
patent: 2002-179667 (2002-06-01), None
Perry, Chemical Engineers' Handbook, 5th. Ed., McGraw-Hill, New York, p. Chapter 13, p.48 and 49 (1973).

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