Production of thiocarbohydrazide on a commercial scale

Details Production of thiocarbohydrazide on a commercial scale Production of thiocarbohydrazide on a commercial scale

1979-06-15

1981-10-13

Demers, Arthur P.

Organic compounds -- part of the class 532-570 series

Organic compounds

Amino nitrogen containing

260704, C07C15900

Patent

active

042949858

ABSTRACT:
In the production of thiocarbohydrazide by reacting hydrazine hydrate with carbon disulphide in the presence of water to form in a first stage hydrazinium dithiocarbazinate, subsequently thermally decomposing the hydrazinium dithiocarbazinate in a second stage to form thiocarbohydrazide, and recovering the thiocarbohydrazide from the reaction medium, the improvement which comprises effecting the entire reaction in the mother liquor of a preceding batch, carrying out the first reaction stage at a temperature between about 25.degree. C. and 45.degree. C., with injection of carbon disulphide below the surface of the reaction mixture; carrying out the second stage at about 62.degree. to 65.degree. C. without prior isolation of the intermediate product; filtering off the thiocarbohydrazide formed after cooling, separating the amount of mother liquor in excess of that required for the next batch, and feeding the balance of the mother liquor to the next batch. The excess mother liquor not required for the next batch is heated to about 70.degree. to 75.degree. C., and after separating off the thiocarbohydrazide, the remaining mother liquor is subjected to combustion.

REFERENCES:
patent: 2657234 (1953-10-01), Klarer et al.
patent: 2726263 (1955-12-01), Audrieth et al.
patent: 2751335 (1956-06-01), Carver et al.
patent: 3929877 (1975-12-01), Toth et al.
patent: 4132736 (1979-01-01), Cramm et al.
patent: 4172092 (1979-10-01), Malone

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