MANUFACTURING METHOD OF HIGH PURITY AMMONIA WATER

摘要

PROBLEM TO BE SOLVED: To provide a method for efficiently obtaining high purity ammonia water extremely small in the concentration of impurities. SOLUTION: Liquefied ammonia at -20 to -5 deg.C is vaporized at the pressure from the vapor pressure of ammonia to 0.7 time of the vapor pressure to obtain ammonia gas and the ammonia gas is dissolved in extra pure water.