Ammonia gas, inorganic compounds, as a gas at room temperature, colorless pungent odor smell, easily soluble in water, soluble in water, ammonia, ammonia molecules and water molecules through hydrogen bonding a * ammonia hydrate (NH3 ยท H2O), a small part of ammonia hydrate ionization into ammonium ions and hydroxyl ions, so ammonia weakly alkaline, can make the phenolphthalein solution turned red. Ammonia and acid action to ammonium salt, ammonia is mainly used as a refrigerant and preparation of ammonium and nitrogen.
At the beginning of twentieth Century, the industry development of the production of ammonia cyanide and ammonia, and the former was eliminated due to energy consumption is far greater than that of the latter. In the world most is ammonia at high temperature and high pressure, the presence of the catalyst composed of nitrogen and hydrogen synthesis. Nitrogen comes mainly from the air; synthesis of hydrogen gas mainly comes from the hydrogen and carbon monoxide (pure hydrogen from water electrolysis). Mixed gas composed of nitrogen and hydrogen as raw gas of synthetic ammonia. From the raw material gas chemical fuel to contain sulfur compounds and oxides of carbon, which is toxic for ammonia synthesis catalyst, to undergo purification treatment in ammonia synthesis.
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