Prepn. of concn. colouring solns. based on 1,4-dialkyl amino-anthraquinone - useful in the colour identification of petroleum prods.

摘要

Prepn. of coloured solns. of a blue hue by reacting under reflux for 30 mins. - 2 hrs. quinizarium with an excess of an aliphatic amine, this is followed by elimination of un-reacted amine and water by distn. then dilution, with stirring of the distn. residue with an alkylphenol-type detergent. The coloured solns. obtd. and the coloured petroleum prods. thereby are also claimed. USE - Colouration of various petroleum prods. is regulated by law e.g. unleaded petrol (in France) is coloured green by addn. of di-nbutyl-amino-anthraquinone (blue) and amino-azobenzene (yellow). The main advantage of the process is the absence of an organic solvent during the reaction between quinarim and the amine.