One-pot synthesis of reactive deep black

A one-pot synthesis for preparing an aqueous reactive black mixture, comprising the following steps a)-f):

• a) dissolving 2-[(4-aminophenyl)sulfonyl]ethanesulfonic acid (vinyl sulphone parabase ester) in water;
• b) diazotizing the dissolved vinyl sulphone parabase ester using excess nitrous acid or using excess nitrite and an acid, resulting in a diazonium salt and remaining nitrous acid;
• c) quenching the remaining nitrous acid with sulfamic acid;
• d) coupling the diazonium salt of step b) with 4-amino-5-hydroxy-2,7-naphthalenedisulfonic acid (H-acid) until the reaction is complete, resulting in Reactive Black 5 (RB 5) and remaining diazonium salt,
• e) coupling the remaining diazonium salt with 7-acetamido-4-hydroxy-2-naphthalenesulfonic acid (acetyl-J-acid) until the reaction is complete resulting in Reactive Orange 78 (RO 78);
• and
• f) obtaining the aqueous reactive black mixture,
• wherein steps a) to e) are performed without intermediate purification and at least steps d) and e) are performed under high shear mixing conditions, and
• wherein the combined concentration of RB 5 and RO 78 at the end of step e) is higher than 0.1 mol/L.