| http://www.w3.org/ns/prov#value | - FIG. 4 is a process flow diagram illustrating a system for the production and purification of terephthalic acid constructed in accordance with a second embodiment of the present invention, particularly illustrating a configuration where the crude slurry exiting the primary oxidation reactor is subjected to combined crystallization and liquor exchange in a zoned slurry concentrator prior to oxidati
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