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[Chemical Knowledge]：Properties and Uses of Liquid Ammonia

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Liquid ammonia is an important inorganic chemical raw material, which is widely used in the field of chemical production. It has unique properties and uses, and plays an important role in the development of modern chemical industry. This article will detail the properties and uses of liquid ammonia.

1. the nature of liquid ammonia

1. physical properties
liquid ammonia is a colorless and transparent liquid, with a strong pungent odor. It has a boiling point of -33.35°C, a freezing point of -77.7°C and a density of 0.617g/cm³. Liquid ammonia volatile, soluble in water, soluble in ethanol and ether and other organic solvents.

2. chemical properties of
liquid ammonia has a strong reduction, can be oxidized into ammonia. It can also react with acids to form salts and with many metals to form hydrogen and the corresponding metal amides. In addition, liquid ammonia also has a certain alkaline, can react with acid to generate ammonium salt.

2. The use of liquid ammonia

1. Refrigerant
Because liquid ammonia has a lower boiling point, it is often used as a refrigerant. In the refrigeration system, liquid ammonia absorbs heat through evaporation, so that the temperature of the surrounding environment is reduced, so as to achieve the effect of refrigeration.

2. chemical raw materials
liquid ammonia can be used as raw materials for many chemicals, such as urea, nitric acid, ammonium salt and so on. It can also be used in the manufacture of plastics, fibers, rubber, pharmaceutical intermediates and other products.

3. Metal smelting
Liquid ammonia can be used as a reducing agent for metal smelting. For example, in copper smelting, liquid ammonia can reduce copper oxides to elemental copper.

4. Clean energy
As a clean energy, liquid ammonia has the characteristics of high energy density and easy storage and transportation. It can generate hydrogen and nitrogen through catalytic cracking reaction, and the hydrogen produced can be used as fuel for fuel cells.

In short, liquid ammonia has a wide range of uses in the field of chemical production raw materials. Because of its unique properties and functions, liquid ammonia plays an important role in the development of modern chemical industry.

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