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    • 8. 发明申请
    • METHOD FOR PURIFYING CRUDE NAPHTHALENEDICARBOXYLIC ACID AND PROCESS FOR PREPARING POLYETHYLENE NAPHTHALATE
    • 净化萘二甲酸的方法和制备聚萘二甲酸乙二醇酯的方法
    • WO1998011047A1
    • 1998-03-19
    • PCT/JP1997003129
    • 1997-09-05
    • MITSUI CHEMICALS, INC.IWASAKI, HiroshiINOKI, SatoshiUEKI, Hiromi
    • MITSUI CHEMICALS, INC.
    • C07C51/493
    • C08G63/78C07C51/493C07C67/60C08G63/189C07C63/38C07C69/76
    • A method for preparing polyethylene naphthalate having a low impurity content from a naphthalenedicarboxylic acid containing impurities, which comprises mixing a crude naphthalenedicarboxylic acid with an aqueous ethylene glycol solution, heating the mixture to esterify a part of the naphthalenedicarboxylic acid to prepare a naphthalenedicarboxylic ester, dissolving the naphthalenedicarboxylic ester in the aqueous ethylene glycol solution, bringing hydrogenatable impurities contained in the crude naphthalenedicarboxylic acid into contact with hydrogen in the presence of a hydrogenation catalyst to hydrogenate the impurities to thereby dissolve the same in the aqueous ethylene glycol solution, crystallizing the naphthalenedicarboxylic ester, separating the crystallized naphthalenedicarboxylic ester from the aqueous ethylene glycol solution, and polycondensating the resultant naphtalenedicarboxylic ester. A method for purifying a crude naphtalenedicarboxylic acid to obtain a naphthalenedicarboxylic acid and a naphthalenedicarboxylic ester each having a low aldehyde content from a naphthalenedicarboxylic acid containing aldehydes, which comprises mixing a crude naphthalenedicarboxylic acid with an aqueous alcohol solution, heating the mixture to esterify a part of the naphthalenedicarboxylic acid to prepare a naphthalenedicarboxylic ester, dissolving the naphthalenedicarboxylic ester in the aqueous alcohol solution, bringing the aldehydes contained in the crude naphthalenedicarboxylic acid into contact with a salt of sulfurous acid to prepare an aldehyde adduct, dissolving the aldehyde adduct in an aqueous alcohol solution, and crystallizing and separating the naphthalenedicarboxylic acid and the naphthalenedicarboxylic ester.
    • 一种从含有杂质的萘二甲酸制备杂质含量低的聚萘二甲酸乙二醇酯的方法,其包括将粗萘二甲酸与乙二醇水溶液混合,加热该混合物以酯化一部分萘二甲酸以制备萘二甲酸酯,溶解 乙二醇水溶液中的萘二甲酸酯,使粗萘二羧酸中含有的可氢化杂质在氢化催化剂存在下与氢接触,氢化杂质,从而将其溶解在乙二醇水溶液中,使萘二羧酸酯结晶 从乙二醇水溶液中分离结晶的萘二甲酸酯,并使所得的萘二甲酸酯缩聚。 一种纯化粗萘二甲酸以从萘醛二羧酸含醛中分离醛含量低的萘二甲酸和萘二羧酸的方法,该方法包括将粗萘二甲酸与醇水溶液混合,加热混合物以酯化部分 的萘二甲酸以制备萘二羧酸酯,将萘二甲酸酯溶解在醇水溶液中,使粗萘二羧酸中所含的醛与亚硫酸盐接触以制备醛加合物,将醛加合物溶解在水 醇溶液,并结晶并分离萘二甲酸和萘二甲酸酯。