Title:
【発明の名称】粗ナフタレンジカルボン酸の精製方法
Document Type and Number:
Japanese Patent JPH10512596
Kind Code:
A
Abstract:
PCT No. PCT/JP96/03180 Sec. 371 Date Jul. 9, 1997 Sec. 102(e) Date Jul. 9, 1997 PCT Filed Oct. 30, 1996 PCT Pub. No. WO97/17318 PCT Pub. Date May 15, 1997The invention provides a method for purifying a crude naphthalenedicarboxylic acid comprising the steps of mixing a crude naphthalenedicarboxylic acid and a water/alcohol solvent to esterify a part of the naphthalenedicarboxylic acid, thereby dissolving a naphthalenedicarboxylic ester into the solvent, and then contacting the resulting reaction mixture with hydrogen in the presence of a hydrogenation catalyst to hydrogenate impurities which are contained in the crude naphthalenedicarboxylic acid and which are capable of being hydrogenated, thereby dissolving and removing hydrogenation products into the water/alcohol solvent. A mixture of a naphthalene dicarboxylic acid and a naphthalenedicarboxylic ester with reduced impurity contents, or a high-purity naphthalenedicarboxylic acid can be obtained.
Inventors:
Hiroshi Iwasaki
Hirokane Shinya
Ishibashi Masayasu
Satoshi Inoki
Hirokane Shinya
Ishibashi Masayasu
Satoshi Inoki
Application Number:
JP51805197A
Publication Date:
December 02, 1998
Filing Date:
October 30, 1996
Export Citation:
Assignee:
Mitsui Chemicals, Inc.
International Classes:
C07C51/487; C07C51/493; C07C63/38; (IPC1-7): C07C63/38; C07C51/487; C07C51/493
Attorney, Agent or Firm:
Shunichiro Suzuki