Bayer Aktiengesellschaft

Mobay Chemical Corporation

James R Malone

Manfred Lenthe

Andreas Gunther

Hans-Walter Hohl

In the preparation of a 2-arylamino-4,6-dichloro-s-triazine of the formula ##STR1## in which R.sup.1 is an optionally substituted aryl radical, and

Process for the preparation of 2-arylamino-4,6-dichloro-s-triazines

In the production of thiocarbohydrazide wherein hydrazine is reacted with carbon disulfide in the presence of water and the reaction product is thereafter heated to evolve hydrogen sulfide, the improvement which comprises effecting the reaction with carbon disulfide in the presence of hydrogen sulfide, whereby the yield of thiocarbohydrazide is increased. At the end of the reaction, the thiocarbohydrazide is filtered off and the mother liquor, after a portion is concentrated and still containing hydrogen sulfide as well as excess hydrazine, is recycled to the next cycle as the source of hydrogen sulfide.

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Dormagen, Germany

James R Malone