Process for production of ammonium N.sup.4 -acetysulfanilylcyanamide

A process for the preparation of a highly pure, concentrated aqueous solution of ammonium N.sup.4 -acetylsulfanilylcyanamide in good yield which comprises:

• a. vigorously contacting an essentially neutral aqueous mixture of an alkali or alkaline earth metal salt or mixtures thereof of N.sup.4 -acetylsulfanilylcyanamide with an inorganic acid and a solution of a water-immiscible organic solvent containing a high molecular weight, aliphatic amine, acid-binding extractant to form a two-phase mixture consisting of an organic phase and an aqueous phase, the amount of said acid being at least equal to the number of moles of acid-binding sites in said amino extractant and the amount of said alkali or alkaline earth metal salt of N.sup.4 -acetylsulfanilylcyanamide being sufficient to convert from about 70% to 100% of said acid-binding sites to an amine salt of N.sup.4 -acetylsulfanilylcyanamide,
• b. separating the aqueous phase therefrom and vigorously contacting the organic phase with a dilute queous alkali in an amount essentially equal to the number of moles of acid-binding sites in said amine extractant not bound to N.sup.4 -acetylsulfanilylcyanamide,
• c. separating the aqueous phase therefrom and vigorously contacting the organic phase with ammonium hydroxide in an amount substantially equal to the molecular equivalents of said alkali or alkaline earth metal salt of N.sup.4 -acetylsulfanilylcyanamide used, and
• d. recovering the aqueous phase therefrom comprising ammonium N.sup.4 -acetylsulfanilylcyanamide in good yield and purity.