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Technical nitrogen

Characteristic

Nitrogen gas - dihydric inert gas without color, taste and smell, slightly soluble in water, density 1.25 kg / m3 at 0 C° and a pressure of 101.3 kPa.

Liquid nitrogen - colorless liquid, odorless, with a boiling point of 77.35 K at a pressure of 101.3 kPa and a specific volume of 1.239 dm3 / kg at 77.35 K, and a pressure of 101.3 kPa. The liquid nitrogen produced from the air by low temperature rectification process, and nitrogen gas - by gasification of liquid.

Nitrogen is nontoxic, but large concentrations of nitrogen causes the phenomenon of oxygen deficiency and suffocation. Therefore, when the nitrogen content of oxygen in the working area must be at least 19% (by volume).

Formula: N2.

The molecular weight (international nuclear weights of 1985) - 28.016.

Classification Nitrogen: first and second grade; technical gas compressed / uncompressed, liquid technical, gas / liquid high purity gaseous / liquid high purity

The use of nitrogen (gaseous and liquid)

Food industry:

Nitrogen gas is intended to create an inert atmosphere in production, storage and transportation of easily oxidized products, vegetable stores. In the food industry, nitrogen is registered as a food additive E941, as the gaseous medium for the packaging and storage of refrigerant in refrigeration systems, and liquid nitrogen is used for oil spill and non-carbonated beverage to generate excessive pressure and inert atmosphere in flexible containers. Artificial ice.

Metallurgy:

Liquid nitrogen is used as refrigerant.

Preservation of closed metal vessels and pipelines and other purposes. Cryogenic cutting, nitriding of metal surfaces. Nitrogen as an inert protective atmosphere is used in the smelting of high strength steels and special alloys, in petroleum refining in the glass industry, etc.

Liquid nitrogen is used in deburring.

Mechanical engineering, instrumentation:

Liquid nitrogen is used as refrigerant for injection into vehicle tires, for preserving the closed metal vessels and pipelines, in the coke production ( "coke dry quenching"). In the electronics industry, nitrogen is used to purge the areas that do not allow the presence of an oxidizing oxygen. Nitrous oxide is used as a fuel component in small spacecraft. Cooling the computer components during extreme overclocking.

Agriculture:

Production of nitrogen fertilizers.

Chemical industry

Nitrogen - raw material for the production of ammonia.

Creation of coatings with a high elasticity and flexibility, and nitric acid.

Deep-freezing of various materials, including organic.

Building:
Freezing saturated soils in the construction of underground facilities. Another purpose of the gaseous species is to execute preservation metal vessels which are closed.

The fire-fighters.