PRODUCTION OF 3,3'-DICHLOROINDANTHRONE专利检索-.....由已含有阴丹士林环的原料制备专利检索查询-专利查询网

PRODUCTION OF 3,3'-DICHLOROINDANTHRONE
申请号	JP19143695	申请日	1995-07-27	公开(公告)号	JPH0940653A	公开(公告)日	1997-02-10
申请人	MITSUI TOATSU CHEMICALS;			发明人	HIRAYAMA AKIRA; OKUMA TADASHI; ITO NAOTO;
摘要	PROBLEM TO BE SOLVED: To obtain the subject compound transformed into an entirely different crystal form and improved in the quality as a fine particulate dyestuff by reducing its azine form compound and subsequently dropping water or an aqueous sulfuric acid solution on the reaction solution at a high temperature. SOLUTION: (A) A compound of formula I is reduced with an inorganic reducing agent preferably such as aluminum powder or iron powder in an aqueous sulfuric acid solution having usually 98wt.%, preferably >=96wt.%. The reaction solution is controlled to a temperature of 80-180 deg.C, preferably 135-140 deg.C, and subsequently dropwlsely mixed with water or an aqueous sulfuric acid solution having a concentration of 40-50% to obtain 3,3'-ichloroindanthrone of formula II. After dropwisely mixed with water or the aqueous sulfuric acid, the sulfuric acid concentration of the reaction solution is preferably 50-95%, and the dropping time is preferably 4-5hr in the case of the aqueous sulfuric acid solution or 5-9hr in the case of water.
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