C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 51/493 (2006.01) C07C 51/487 (2006.01) C07C 63/38 (2006.01)
Patent
CA 2209907
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.
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.
Hirokane Nobuya
Inoki Satoshi
Ishibashi Masayasu
Iwasaki Hiroshi
Mitsui Petrochemical Industries Ltd.
Smart & Biggar
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