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1. (WO1997017318) METHOD FOR PURIFYING CRUDE NAPHTHALENEDICARBOXYLIC ACID
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1997/017318 International Application No.: PCT/JP1996/003180
Publication Date: 15.05.1997 International Filing Date: 30.10.1996
IPC:
C07C 51/487 (2006.01)
C CHEMISTRY; METALLURGY
07
ORGANIC CHEMISTRY
C
ACYCLIC OR CARBOCYCLIC COMPOUNDS
51
Preparation of carboxylic acids or their salts, halides, or anhydrides
42
Separation; Purification; Stabilisation; Use of additives
487
by treatment giving rise to chemical modification
Applicants:
MITSUI PETROCHEMICAL INDUSTRIES, LTD. [JP/JP]; 2-5, Kasumigaseki 3-chome Chiyoda-ku Tokyo 100, JP (AllExceptUS)
IWASAKI, Hiroshi [JP/JP]; JP (UsOnly)
HIROKANE, Nobuya [JP/JP]; JP (UsOnly)
ISHIBASHI, Masayasu [JP/JP]; JP (UsOnly)
INOKI, Satoshi [JP/JP]; JP (UsOnly)
Inventors:
IWASAKI, Hiroshi; JP
HIROKANE, Nobuya; JP
ISHIBASHI, Masayasu; JP
INOKI, Satoshi; JP
Agent:
SUZUKI, Shunichiro; Suzuki & Associates 13-6, Nishigotanda 7-chome Shinagawa-ku Tokyo 141, JP
Priority Data:
7/29310110.11.1995JP
8/12189916.05.1996JP
Title (EN) METHOD FOR PURIFYING CRUDE NAPHTHALENEDICARBOXYLIC ACID
(FR) PROCEDE DE PURIFICATION D'ACIDE NAPHTATLENEDICARBOXYLIQUE BRUT
Abstract:
(EN) The 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/methanol solvent. A mixture of a naphthalenedicarboxylic acid and a naphthalendicarboxylic ester with reduced impurity contents, or a high-purity naphthalenedicarboxylic acid can be obtained.
(FR) La présente invention concerne un procédé de purification d'acide naphtatlènedicarboxylique brut. Ce procédé comprend le mélange d'un solvant eau-alcool et d'acide naphtalènedicarboxylique brut pour estérifier une partie de ce dernier, ce qui dissout un ester naphtalènedicarboxylique dans le solvant. Après cela, on met le mélange de réaction ainsi obtenu en contact avec de l'hydrogène en présence d'un catalyseur d'hydrogénation, pour hydrogéner les impuretés qui sont contenues dans l'acide naphtalènedicarboxylique brut et qui peuvent être hydrogénées. Cela dissout et élimine les produits de l'hydrogénation dans le solvant eau-méthanol. On parvient ainsi à obtenir un mélange d'un acide naphtalènedicarboxylique et d'un ester naphtalènedicarboxylique à teneur en impuretés réduite ou bien un acide naphtalènedicarboxylique très pur.
Designated States: CA, CN, JP, KR, US
European Patent Office (DE, FR, GB, IT, NL)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
EP0802896US5872284JPH10512596 CN1168131CA2209907KR1019980701285