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:
Oct. 16, 2012
Filed:
Sep. 24, 2008
Applicants:
Yang-ho Cheon, Gyeonggi-do, KR;
Young-gyo Choi, Gyeonggi-do, KR;
Inventors:
Yang-Ho Cheon, Gyeonggi-do, KR;
Young-Gyo Choi, Gyeonggi-do, KR;
Assignee:
Hyosung Corporation, Seoul, KR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C 63/36 (2006.01);
U.S. Cl.
CPC ...
Abstract
The present invention relates to a method for separating and refining high purity 2,6-naphthalene dicarboxylic acid having an excellent color and purity of 99.9% or more by using crude 2,6-naphthalene dicarboxylic acid. And more particularly, the present invention relates to a method for separating and refining 2,6-naphthalene dicarboxylic acid, in which adjustment of pressure and temperature during multiple-step crystallization process enables controlling nucleation and the crystal growth rate, thereby allowing a particle size distribution and form to be controlled.