Process for treating wash water from the manufacture of terephth

Details Process for treating wash water from the manufacture of terephth Process for treating wash water from the manufacture of terephth

1983-11-30

1985-09-10

Cintins, Ivars

Liquid purification or separation

Processes

Ion exchange or selective sorption

210670, 210674, 210677, 210685, 210686, C02F 142

Patent

active

045404933

ABSTRACT:
A process for treating wash water from the manufacture of terephthalic acid, wherein the wash water includes terephthalic acid, metal catalyst, and organic acid byproducts. The process includes the steps of passing the wash water through a filter medium to remove undissolved terephthalic acid solids, passing the filtered water through a cation exchange resin in hydrogen ion form to remove the metal catalysts, and passing the water through an anion exchange resin to remove dissolved terephthalic acid and dissolved organic acid byproducts. The treated water and certain components removed from the wash water are recovered and reused in the manufacture of additional terephthalic acid. An apparatus in which the process is practiced is also described and, after a quantity of wash water has been treated, the apparatus is regenerated with regenerants that are also recovered and reused in the manufacture of additional terephthalic acid.

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