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	JP4675895	申请日	1995-03-07	公开(公告)号	JPH08245596A	公开(公告)日	1996-09-24
申请人	MITSUI TOATSU CHEMICALS;			发明人	HIRAYAMA AKIRA; OKUMA TADASHI; ITO NAOTO;
摘要	PURPOSE: To obtain 3,3'-dichloroindanthrone of increased crystal size with filterability improved in industrially high efficiency by discharging the reaction mixture after its azin form is reduced and adding an anionic surfactant to the discharged solution. CONSTITUTION: (A) The compound of formula I is reduced in sulfuric acid and the reaction mixture is discharged in water and (B) an anionic surfactant, preferably a sulfonate salt of an alkyl carboxylic acid derivative, preferably in an amount of 1-30wt.%, more preferably 1-5wt.%, particularly 2-3wt.% based on the component A, to give 3,3'-dichloroindanthrone of formula II. When the component B is added, the reaction mixture is kept at 10-70 deg.C, particularly 20-35 deg.C. The amount of the water to which the reaction mixture is discharged is adjusted so that the concentration of the sulfuric acid used in the reduction becomes 10-50wt.%, preferably 20-40wt.% after the discharge.
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