Mobay Corporation

Gary W Combs

Dennis E Jackman

Dietmar B Westphal

Westphal Dietmar B

TCH is produced by a process which does not require expensive measures to remove hydrazine. In this process, hydrazinium dithiocarbazinate is reacted with an amine other than hydrazine or a strong base, optionally in the presence of water. It is preferred that a sulfur suppressing compound also be included in the reaction mixture. The precipitated TCH is removed from the reaction mixture to leave a mother liquor. Hydrazinium-dithiocarbazinate may then be added to the mother liquor. TCH precipitates and may be readily recovered.

Process for the production of thiocarbohydrazide

Thiocarbohydrazide (TCH) is made by reacting carbon disulfide and hydrazine in the presence of a mercaptan at an elevated temperature. The TCH is removed from the reaction mixture, the mother liquor is further treated to form HDTC which is further reacted to form TCH and the mother liquor is recycled. A major advantage of this process is the recyclability of the mother liquor without reduction in TCH yield.

TCH is produced in two stages. In the first stage, carbon disulfide and excess hydrazine are reacted in the presence of a mercaptan and optionally a strong base or an amine other than hydrazine. Carbon disulfide and a strong base (if none was present during the first stage) are then added to the reaction mixture which is further reacted to complete the formation of TCH.

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Blue Springs, MO, United States of America

Gary W Combs