Process for the preparation of disazo condensation pigments in microreactors

摘要

The invention relates to a process for the preparation of disazo condensation pigments by diazotization of an aromatic amine, azo coupling with a coupling component to an azocarboxylic acid or azodicarboxylic acid, formation of an azocarboxylic acid chloride or azodicarboxylic acid dichloride, and condensation of the azocarboxylic acid chloride with an aromatic diamine or the azodicarboxylic acid dichlorinated dichloride that the acid chloride formation and / or the condensation and possibly the diazotization and optionally the azo coupling are carried out in a microreactor.