Abstract: The invention concerns the purification of impure aqueous hydrazine hydrate solutions by treating the hydrazine hydrate solution by means of a solid absorbent material consisting of microporous particles whose mean granulometry is smaller than 5 mm.

Abstract: A process for purifying crude synthetic mercaptobenzothiazole according to the invention, which comprises treating the crude mercaptobenzothiazole with aniline, filtering and washing the crystallized mercaptobenzothiazole with aniline and, if desired, recycling the liquid organic phases of the purification medium, wherein the crystallization of mercaptobenzothiazole, the filtration and the washing are carried out at a temperature of from 40.degree. to 120.degree. C.

Abstract: A process for preparing 3-amino-1,2,4-triazole by reacting hydrazine hydrate, cyanamide and formic acid to form aminoguanidine formate and cyclizing the formate, wherein hydrazine hydrate and formic acid are simultaneously added to the cyanamide at 0.degree. to 10.degree. C. and a pH of 6 to 7, maintaining the mixture at 60.degree. to 100.degree. C. and a pH of 7 to 8 to form aminoguanidine formate, evaporating the aminoguanidine formate solution at 30.degree. to 60.degree. C. to a solids content of 100 to 700 g/L, filtering and washing the formate to a dicyandiamide content below 0.25%, and heating the formate at 110.degree. to 200.degree. C. to obtain the aminotriazole.

Abstract: A process for the preparation of benzothiazole-sulfenamides in which a benzothiazyl disulfide is reacted with a mixture comprising an amine halogenhydrate and an N-halogen amine derivative.