Liquid ammonia, also known as anhydrous ammonia, is a colorless liquid with a strong pungent smell. As an important chemical raw material, ammonia is usually produced by pressurizing or cooling gaseous ammonia to obtain liquid ammonia for convenient transportation and storage. Liquid ammonia dissolves easily in water, and forms ammonium ions NH4+ and hydroxide ions OH- after dissolving in water. The solution is alkaline. Liquid ammonia is mostly stored in pressure-resistant cylinders or steel tanks, and cannot coexist with acetaldehyde, acrolein, boron and other substances. Liquid ammonia is widely used in industry and is corrosive and volatile, so its chemical accident rate is very high.
                               
Research and investment prospect evaluation report of China's liquid ammonia industry 2013-2017 liquid ammonia is mainly used in the production of nitric acid, urea and other chemical fertilizers, and can also be used as raw materials for medicine and pesticides. Liquid ammonia liquid ammonia is used in the defense industry to make propellant for rockets and missiles. It can be used as an ammoniated raw material for organic chemical products. Because liquid ammonia can absorb a large amount of heat after gasification, it is known as a "refrigerant". At the same time, liquid ammonia has certain sterilization effect. Liquid ammonia can also be used in textile mercerization. The unshared pairs of NH3 molecules tend to form coordination bonds with other molecules or ions to form various forms of ammonia complexes. For example, [Ag(NH3)2]+, [Cu(NH3)4]2+, and BF3·NH3, etc. are all coordination complexes with NH3. Liquid ammonia is a good solvent, and because of its molecular polarity and the presence of hydrogen bonds, it is very similar to water in many physical properties. Some reactive metals can displace hydrogen from water and produce hydroxide, which is less easily displaced in liquid ammonia. But liquid ammonia dissolves the metal to form a blue solution. This metal liquid ammonia solution can conduct electricity, and slowly decompose to release hydrogen, with strong reducibility. For example, sodium's liquid ammonia solution: metallic liquid ammonia solution appears blue, can conduct electricity and has strong reducibility because of the generation of "ammoniated electrons" in the solution.
                               
Such as sodium metal dissolved in liquid ammonia lost its valence electrons generated positive ions: heating to 800 ~ 850 ℃, liquid ammonia in the role of nickel-based catalysts, the ammonia decomposition, can get hydrogen nitrogen mixture containing 25% 75% H2 and N2 gas. The gas obtained by this method is a good protective gas, which can be widely used in semiconductor industry, metallurgical industry, and other industrial and scientific research that needs to protect the atmosphere.
                               
Ammonia and acetic acid gas heated to 420 ℃, under the effect of catalyst, the synthesis of acetonitrile.For example, sodium's liquid ammonia solution: metallic liquid ammonia solution appears blue, can conduct electricity and has strong reducibility because of the generation of "ammoniated electrons" in the solution.

 Liquid ammonia, also known as anhydrous ammonia, is a colorless liquid with a strong pungent smell.
 Liquid ammonia, also known as anhydrous ammonia, is a colorless liquid with a strong pungent smell.