Process for the preparation of aniline condensation dyestuffs
AssigneeBayer Aktiengesellschaft
InventorsWerner Maurer, Johann Zimmer
Life of this patent
Estimating the term…
Abstract
Process for the preparation of aniline condensation dyestuffs by reacting aniline and/or an alkylaniline batchwise, in cycles or continuously with nitrobenzene, which can be substituted and/or diazoaminobenzene, with warming and in the presence of a catalyst, characterized in that the reaction mixture is worked up continuously.
Claims7
In a process for the preparation of an aniline condensation dyestuff by reacting aniline and/or an alkyl aniline, batchwise, in cycles or continuously with nitrobenzene, which can be substituted, and/or diazoaminobenzene, with warming and in the presence of a catalyst, the improvement wherein the reaction mixture is worked up by continuously mixing the same with dilute hydrochloric acid and the dyestuff which has precipitated out is continuously filtered off.
Dependencies are inferred from the claim text.