Removal of permanganate reducing compounds from methanol...

Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof

Reexamination Certificate

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C562S608000, C568S492000

Reexamination Certificate

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10708421

ABSTRACT:
An improvement of the methanol carbonylation process for manufacturing acetic acid is disclosed. Specifically disclosed is a method for removing permanganate reducing compounds (“PRC's”) from the condensed light ends overhead stream, including (a) distilling at least a portion of the condensed light ends overhead to yield a PRC enriched second overhead stream; (b) extracting the second overhead stream with water and separating therefrom an aqueous stream containing PRC's; and (c) returning at least a portion of the extracted second overhead to the second distiller.

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