In terms of raw materials what are the methods of ammonia production

Ammonia production from natural gas. Natural gas is first desulphurised, and then through the secondary conversion, and then through the carbon monoxide conversion, carbon dioxide removal and other processes, the nitrogen and hydrogen mixture, which still contains carbon monoxide and carbon dioxide of about 0.1% to 0.3% (by volume), removed by the methanation effect, the hydrogen and nitrogen molar ratio of 3 of the pure gas, through the compressor compression into the ammonia synthesis circuit, the product of ammonia. Naphtha as raw material ammonia production process is similar to this process. 　　

Heavy oil to ammonia. Heavy oil, including a variety of deep processing of residual oil, can be part of the oxidation method of ammonia feedstock gas, the production process is simpler than natural gas vapour conversion method, but the need for air separation device. Oxygen produced by the air separation device for heavy oil gasification, nitrogen as a raw material for ammonia synthesis, liquid nitrogen is also used to remove carbon monoxide, methane and argon as a detergent. 　　

Coal (coke) to ammonia. With the development of petrochemical and natural gas chemical industry, coal (coke) as a raw material for the production of ammonia has been rarely used in the world. Uses ammonia is mainly used in the manufacture of nitrogen fertiliser and compound fertiliser, ammonia as an industrial raw material and ammonia feed, the amount of about 12% of world production. Nitric acid, a variety of nitrogen-containing inorganic salts and organic intermediates, sulfonamide drugs, polyurethane, polyamide fibres and nitrile rubber, etc. need to be directly ammonia as raw material. Liquid ammonia is often used as a refrigerant.

A portion of the stored commercial ammonia is shipped in liquid form from the manufacturing plant to the field. In addition, in order to ensure the balance of supply and demand between synthetic ammonia and ammonia processing plant in the manufacturing plant, and to prevent the production from being stopped due to short-term accidents, it is necessary to set up liquid ammonia storage. Depending on the capacity, there are three types of liquid ammonia storage: non-refrigerated, semi-frozen and fully refrigerated. Liquid ammonia can be transported by sea,