Method for purifying monomethylhydrazine gas

摘要

PROBLEM TO BE SOLVED: To provide a manufacturing method of monomethylhydrazine gas capable of removing moisture contained in marketed monomethylhydrazine with purity of 98 wt.% or more, suppressing generation of ammonia and the like by self-decomposition and providing monomethylhydrazine gas containing almost no impurity.SOLUTION: By conducting a purification treatment for contacting monomethylhydrazine gas with an absorbent mainly containing alumina and containing no synthetic zeolite, moisture or impurities such as monomethyl amine contained in the monomethylhydrazine gas is removed.SELECTED DRAWING: Figure 1