The use of nitrogen is quite extensive, nitrogen as an inert gas, can drive oxygen, thus inhibiting bacterial growth, can also prevent oxidation, as a protective gas. Nitrogen is very popular, nitrogen can be used in various industries.

Applications in industry

The chemical industry, fertilizer industry, petrochemical industry and petrochemical fiber industry have a large demand for nitrogen. In the Soviet Union, 63.7% of nitrogen is used in the chemical and fertilizer industry, in the production of nitrogen, urea, caprolactam, ethylene, propylene, polyvinyl chloride, man-made fibers, synthetic fibers, silicone rubber products, cable synthetic leather, nitrogen as a process gas has been widely used and developed. Especially the ethylene plant has a special important position in the petrochemical industry. China's ethylene industry has begun to take shape after nearly 30 years of development. In 1993, the national ethylene production of 2.03 million tons, it is expected that in 2000, China's ethylene demand will exceed 5 million tons, in 2010 will reach 8 to 10 million tons. At present, foreign ethylene plants are developing to large-scale, and the scale of new plants is mostly 300,000 to 700,000 tons/year.

In chemical plants, nitrogen is mainly used as protection gas, replacement gas, and washing gas to ensure safe production. Such as polypropylene production, pure nitrogen (99.99%) should be used as protection gas and replacement gas. High purity nitrogen is a vital gas for chemical fiber production, such as Liaoyang Petroleum chemical fiber plant has three sets of 3000 meters 3/ h high purity nitrogen devices. Synthetic leather factory should also use high purity nitrogen protection, such as Yantai synthetic leather factory has a 1000 meters 3/ hour high purity nitrogen device. Nitrogen is also used in forest chemical plants as a process protection gas for sensitive adhesive coatings, rosin, resins and other production processes. It can be said that chemical plants are large users of nitrogen, nitrogen is the "security gas" of chemical plants, and it is promising to develop nitrogen for chemical industry.