Ultrapure hydrazine production

摘要

A process for producing hydrazine containing at least 98 percent by weight of N2H4 which admixes an aqueous solution of hydrazine with an alkali metal hydroxide to form a hydrazine solution having a N2H4 concentration of at least 70 percent by weight. The molar ratio of alkali metal hydroxide to water is less than about 0.5:1. The concentrated hydrazine solution is distilled in a fractional distillation apparatus at an overhead vapor temperature below about 50 DEG C. and at a pressure of less than about 60 mm Hg.