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    • 8. 发明授权
    • Process for separation of naphthoquinone and phthalic acid
    • 分离萘醌和邻苯二甲酸的方法
    • US4202828A
    • 1980-05-13
    • US868349
    • 1978-01-10
    • Ryo MatsuuraTatsuyoshi KomatsuYukio NomiyamaKenji Usui
    • Ryo MatsuuraTatsuyoshi KomatsuYukio NomiyamaKenji Usui
    • C07C46/04C07C46/10C07C51/487C07C45/24C07C49/66C07C51/48C07C63/16
    • C07C46/10C07C46/04C07C51/487
    • In a process for separation of naphthoquinone and phthalic acid from an aqueous slurry prepared by contacting a reaction mixture gas formed by a catalytic vapor phase oxidation of naphthalene with an aqueous medium, the decomposition of naphthoquinone is prevented and phthalic acid is substantially separated by adding a base to the aqueous slurry so as to neutralize only sulfuric acid component and maleic acid component without substantially neutralizing phthalic acid component and heating the aqueous slurry to dissolve phthalic acid to form a slurry of naphthoquinone in an aqueous solution of phthalic acid and extracting naphthoquinone with a solvent while preventing a crystallization of phthalic acid.A pH of the aqueous slurry is adjusted in a range of 1.2 to 2.5 before the heat dissolution of phthalic acid and the extraction of naphthoquinone.An aqueous phase obtained after the extraction of naphthoquinone is cooled to crystallize phthalic acid and then the filtrate separating from the resulting slurry is used as an aqueous medium for contacting with the reaction mixture gas, optionally after adjusting pH in a range of 1.2 to 2.5.
    • 在通过将通过萘的催化气相氧化形成的反应混合物气体与水性介质接触而制备的水性浆液分离萘醌和邻苯二甲酸的方法中,萘醌的分解被防止,邻苯二甲酸通过加入 以仅中和硫酸成分和马来酸成分,而基本不中和邻苯二甲酸成分,加热含水浆料溶解邻苯二甲酸,形成萘醌在邻苯二甲酸水溶液中的浆液,并用萘磺酸提取萘醌 溶剂,同时防止邻苯二甲酸的结晶。 在邻苯二甲酸的热溶解和萘醌的萃取之前,将水性浆液的pH调节在1.2〜2.5的范围内。 冷却萃取萘醌后得到的水相,使邻苯二甲酸结晶,然后将所得浆液分离出的滤液用作与反应混合物气体接触的水性介质,任选在将pH调节在1.2〜2.5的范围内后,