Liquid purification or separation – With heater or heat exchanger – With treating fluid addition
Reexamination Certificate
2008-07-08
2008-07-08
Prince, Fred (Department: 1797)
Liquid purification or separation
With heater or heat exchanger
With treating fluid addition
C210S179000, C210S180000, C210S321600
Reexamination Certificate
active
07396457
ABSTRACT:
An apparatus and a method for effectively recovering acetic acid and catalyst from a mother liquor discharged from a series of processes including an oxidation process, a crystallization process and a solid-liquid separation process, in a continuous process for preparing naphthalenedicarboxylic acid by oxidizing dimethylnaphthalene in the presence of an oxygen-containing gas and an acetic acid solvent, using a catalyst system comprising a transition metal such as cobalt or manganese, and a bromine-based compound, are provided.
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Global Spec; Mar. 25, 2005; XP002405331; http://separationequipment.globalspec.com/LearnMore/Processing—Equipment/Filtration—Separation—Products/Liquid—Solid—Filtration—Separation—Equipment.
Choi Young-gyo
Ji Jong-Cheul
Kwon Ik-Hyun
Song Byung-Jun
Hyosung Corporation
Nixon & Vanderhye P.C.
Prince Fred
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