(2) Purification The crude feed gas is purified to remove impurities other than hydrogen and nitrogen, mainly including shift process, desulfurization and decarbonization process and gas refining process.
(3) Finally, the pure mixed gas of hydrogen and nitrogen is compressed to high pressure under the action of catalyst to synthesize ammonia. Synthetic ammonia is the process of providing liquid ammonia products and the core part of the whole synthetic ammonia production process. Ammonia synthesis reaction is carried out under high pressure and catalyst conditions. Because the ammonia content in the gas after the reaction is not high, generally only 100, the unreacted hydrogen and nitrogen circulation process is adopted.
Extended data
Ammonia is one of the important inorganic chemical products and occupies an important position in the national economy. About 80% of ammonia is used to produce chemical fertilizer, and 20% is the raw material of other chemical products.
Ammonia is mainly used to make nitrogen fertilizer and compound fertilizer, such as urea, ammonium nitrate, ammonium phosphate, ammonium chloride and various nitrogen-containing compound fertilizers, all of which are based on ammonia. As an industrial raw material and ammoniated feed, ammonia accounts for about12 of the world output.
Nitric acid, various nitrogen-containing inorganic salts, organic intermediates, sulfonamides, polyurethane, polyamide fibers, nitrile rubber, etc. all directly need ammonia as raw materials. Liquid ammonia is often used as a refrigerant, and some commercial ammonia stored and transported is transported to other places by manufacturers in liquid form.
Baidu encyclopedia-synthetic ammonia