Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group viib metal
Reexamination Certificate
2008-06-03
2008-06-03
Bos, Steven (Department: 1793)
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group viib metal
C562S414000, C562S416000, C562S485000, C562S486000, C562S487000
Reexamination Certificate
active
07381386
ABSTRACT:
A method for removing impurities from a mother liquor comprising a carboxylic acid, a metal catalyst, impurities by (a) evaporating the mother liquor comprising a carboxylic acid, a metal catalyst, impurities and a solvent in a first evaporator zone to produce a vapor stream and a concentrated mother liquor stream; (b) evaporating the concentrated mother liquor stream in a second evaporator zone to form a solvent rich stream and a super concentrated mother liquor stream; (c) mixing in a mixing zone a water-solvent solution and optionally an extraction solvent with the super concentrated mother liquor stream to form an aqueous mixture; (d) optionally separating organic impurities from the aqueous mixture in a solid-liquid separation zone to form a purified aqueous mixture; and (e) extracting the aqueous mixture or purified aqueous mixture with an extraction solvent in an extraction zone to form an extract stream and the raffinate stream.
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de Vreede Marcel
Lin Robert
Bos Steven
Eastman Chemical Company
Graves, Jr. Bernard J.
Owen Steven A.
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