Ammonia, also known as anhydrous ammonia is a colorless liquid with a strong pungent odor. Ammonia as an important chemical raw material, for transport and storage facilities, gaseous ammonia is usually obtained by pressurized liquid ammonia or cooling. Ammonia soluble in water, soluble in water to form an ammonium ion NH4 +, hydroxide ions OH-, alkaline alkaline solution. Multi-pressure liquid ammonia storage in cylinders or steel tank, and can not coexist with acetaldehyde, acrolein, boron and other substances. Ammonia is widely used in industry, corrosive and volatile, so its high chemical accidents.