Chemistry of inorganic compounds – Extracting – leaching – or dissolving
Reexamination Certificate
2003-06-05
2008-08-12
Bos, Steven (Department: 1793)
Chemistry of inorganic compounds
Extracting, leaching, or dissolving
C423SDIG014, C562S416000, C562S485000, C562S487000, C562S414000, C562S412000, C562S608000
Reexamination Certificate
active
07410632
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, the metal catalyst, impurities, water 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) separating organic impurities with a water-solvent solution from the super concentrated mother liquor in a solid-liquid separation zone to form an aqueous stream and a second aqueous stream; (d) mixing in a mixing zone water and optionally and extraction solvent with the aqueous stream and second aqueous stream to form an aqueous mixture; and (e) adding an extraction solvent to the aqueous mixture in an extraction zone to form an extract stream and a raffinate stream.
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Bos Steven
Eastman Chemical Company
Graves, Jr. Bernard J.
Owen Steven A.
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