PROCESS FOR SEPARATING AND PURIFYING ALKALI METAL SALTS OF HYDROXYNAPHTHALENECARBOXYLIC ACIDS
申请人:KABUSHIKIKAISHA UENO SEIYAKU OYO KENKYUJO
公开号:EP0913386A1
公开(公告)日:1999-05-06
The present invention provides a process for separating and purifying alkali metal salts of hydroxynaphthalenecarboxylic acids, in which alkali metal salt(s) of hydroxynaphthalenecarboxylic acid(s) are separated and purified from a mixture of alkali metal salts of hydroxynaphthalenecarboxylic acids by treating it with a nonionic porous synthetic adsorbent using water or water and water-soluble organic solvent(s).