Preparation of quinacridone using fecl3

Details Preparation of quinacridone using fecl3 Preparation of quinacridone using fecl3

C - Chemistry, Metallurgy

09

B

260/275

C09B 48/00 (2006.01) C09B 67/52 (2006.01)

Patent

CA 1071208

ABSTRACT Improved process for preparing quinacridone pigment by oxidizing the corresponding dihydroquinacridone wherein the dihydroquinacridone is oxidized in the liquid organic medium in which it is prepared using FeCl3 and, optionally, in the presence of N-methyl-2-pyrrolidone. The process eliminates the need to isolate the dihydroquin- acridone prior to oxidation and enables recovery of the organic liquid employed.

261796

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