Abstract: A single-step process is disclosed for purifying raw cyanogen chloride gas contaminated with chlorine by fractionally separating chlorine from cyanogen chloride and thereafter absorbing essentially chlorine-free cyanogen chloride in a solvent.

Abstract: An improved process is provided for the production of 1-substituted-3-hydroxy-5-chloro-1,2,4-triazoles which involves reacting in dilute solution a 1-substituted-1-cyanohydrazine with phosgene in tetrahydrofuran as the specific inert solvent, treating the reaction mixture with anhydrous ammonia to form an ammonium salt of the 1,2,4-triazole, said ammonium salt being insoluble in tetrahydrofuran, and liberating from said isolated salt the 1,2,4-triazole in yields from about 85 to 92% of theory and in very pure state by treating said salt with an acid. The 1,2,4-triazoles are valuable intermediates in the manufacture of pesticides.

Abstract: A process for destroying the soluble cyanide complex content of industrial wastewater streams which comprises acidification of the stream and chlorination at temperatures of at least 80.degree. C., the soluble cyanide complexes breaking down to free CN.sup.- which subsequently hydrolyzes to ammonium chloride and carbon dioxide.