Azo dyes

Azo dyes and synthetic organic dyes, in the molecule contains one or more isogroup (N = N). To azo dyes are chrysoidine, Janus red, methyl orange, Congo red, amaranth, Sudan, and others are azo dyes combination diazotized aromatic amines with phenols and aromatic amines in the water, the alkaline or acid environment.
Technology of production of azo dyes enables selection of the reaction products from the reaction of the masses, cleaning, drying and grinding of intermediate and final products. From a hygienic point of view, deserve the attention of the processes of filtration, drying and milling. At high temperature (from 100 to 250 degrees) azo dyes decays; dusty mixture of azodyes, the molecule of which there are two nitrogroup (NO2) or more explosive. In the body azo dyes comes mainly through the respiratory tract and the skin. Some azo dyes made with urine.
Acute poisoning azo dyes in production conditions are not documented: dermatitis , is relatively rare. Some azo dyes (p-dimethylaminoazobenzene, aminoazotoluene and others) can cause the development of malignant tumors. Working a long time for drying and grinding of azodyes described (single cases) tumors of the bladder. Disease prevention in the production of azo dyes: mechanization and sealing processes, filtration, drying and grinding; production of azo dyes in the form of pastes, suspensions, granules; provision of production facilities of supply and local exhaust ventilation and permanent control over its effectiveness; the observance of personal hygiene, use of protective clothing, personal protection - respirators, rubber gloves; periodic medical examinations of workers. The control over a condition of air environment of industrial premises. Special care requires the use of azo dyes in food industry. In the USSR the use of azo dyes for dyeing of food is limited.