Process for the purification of a crude carboxylic acid slurry

Details Process for the purification of a crude carboxylic acid slurry Process for the purification of a crude carboxylic acid slurry

2006-11-07

2006-11-07

Oh, Taylor Victor (Department: 1625)

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

Organic compounds

Carboxylic acids and salts thereof

C562S416000, C562S485000

Reexamination Certificate

active

07132566

ABSTRACT:
Disclosed is a process to produce a purified carboxylic acid product. The process comprises removing impurities from a crude carboxylic acid slurry in a solid-liquid displacement zone to form a slurry product. The slurry product if further treated in a staged oxidation zone and a crystallization zone to from a crystallized product. The crystallized product is further cooled in a cooling zone and subsequently filtered and dried in a filtration and drying zone. The process produces purified carboxylic acid product having good color and low impurity levels without the use of purification steps like hydrogenation.

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