The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 08, 2008
Filed:
Jun. 27, 2006
Ik-hyun Kwon, Kyonggi-do, KR;
Young-gyo Choi, Kyonggi-do, KR;
Byung-jun Song, Kyonggi-do, KR;
Jong-cheul Ji, Kyonggi-do, KR;
Ik-Hyun Kwon, Kyonggi-do, KR;
Young-Gyo Choi, Kyonggi-do, KR;
Byung-Jun Song, Kyonggi-do, KR;
Jong-Cheul Ji, Kyonggi-do, KR;
Hyosung Corporation, Kyonggi-do, KR;
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.