Production of hydroxylamine nitrate by dialysis.

摘要

A dialysis unit has a tank (2) divided into chambers by cation exchange membrane (1), e.g. made of a copolymer of styrene and divinyl benzene; an aqueous solution of hydroxylamine sulfate and a solution of nitric acid are placed in adjacent chambers and allowed to dialyse so that the NH3OH<+> and H<+> ions pass through the membrane and the nitric acid is converted to hydroxylamine nitrate as desired product. The solutions are recirculated via storage tanks (5, 6) by means of pumps (7, 8). The dialysis can be assisted by electrolysis with an anode (3) and cathode (4) at the ends of the tank divided into multiple compartments separated by the membranes (Fig. 1), or it can be purely by diffusion between adjacent chambers within the tank. The concentration of hydroxylamine sulfate is maintained higher than that of the nitrate, by about 1 mole, so as to promote the dialysis. A high rate of production is obtained with simple apparatus.