Method for removing formic acid from aqueous solutions

Details Method for removing formic acid from aqueous solutions Method for removing formic acid from aqueous solutions

2007-02-20

2007-02-20

Drodge, Joseph (Department: 1723)

Liquid purification or separation

Processes

Chemical treatment

C210S758000, C210S774000, C568S864000, C568S868000, C203S028000, C203S039000

Reexamination Certificate

active

10473203

ABSTRACT:
Formic acid is at least partly removed from an aqueous solution comprising formic acid, cyclohexanone and cyclohexanol by decomposition over certain decomposition catalysts.The method is preferably used for processing reaction products from the oxidation of cyclohexane and comprises:(i) extracting a product gas mixture obtained in the oxidation of cyclohexane with an aqueous scrubbing liquid,(ii) separating the aqueous solution obtained in (i) by distillation into an aqueous solution comprising formic acid, cyclohexanone and cyclohexanol together with further minor organic components and a carboxylic acid mixture(iii) removing the formic acid at least partially from the aqueous solution obtained in (ii) by decomposition, and(iv) further processing the aqueous solution obtained in (iii) to give epsilon-caprolactam, or using the aqueous solution obtained in (iii) as scrubbing liquid in (i).

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Hawley's Condensed Chemical Dictionary, 13thEdition, Revised by Richard Lewis, Copyright 1997.
R.S.Coffey,Chemical Comm. 1967, 923-924.
Derwent Abst. 84-199128/19.
Derwent Abst. 89-303688/42—JP 1222-917-A.

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