| 摘要 |
PURPOSE:To obtain the titled compound useful as an intermediate for pigments, etc. in high yield and purity, by reacting phthalic anhydride with chlorine in the vapor phase in the presence of a catalyst prepared by incorporating CoCl2 as an essential component with CaCl2, etc., and supporting the resultant mixture on active carbon at a specific temperature. CONSTITUTION:Phthalic anhydride preferably in 1-3vol% concentration and chlorine gas in an amount of 1-2 times the theoretical amount are fed onto a catalyst prepared by supporting a mixture containing CoCl2 as a principal component and one or more components selected from CaCl2, BaCl2 and LaCl3 on active carbon at 200-400 deg.C, preferably 300-380 deg.C and 200-1,000/hr space velocity of the reaction gas and reacted in the vapor phase to give the aimed compound. The molecular ratio between the mixture of one or more selected from CaCl2, BaCl2 and LaCl3 and CoCl2 is 1:0.1-1.5, and the total amount of the supported mixture is 5-100pts.wt. based on 100pts.wt. active carbon. USE:A raw material for flame-retardant polyesters. |
