METHOD FOR THE PRODUCTION OF PURE C.I. PIGMENT ORANGE 74

摘要

The invention relates to a method for conditioning and purifying pigment orange 74. Said method is characterized in that the aqueous suspension of the raw pigment, optionally after adding an organic solvent from the group comprising isobutanol, chlorobenzene, and o-dichlorobenzene, is subjected to a finishing treatment, the organic solvent is optionally removed using a distillation process, the remaining aqueous pigment suspension is mixed with a non-ionic surfactant and is heated to a temperature ranging from 30 to 100 degrees C, and the pigment is then filtered off.