Ammonium Sulfate - Ammonium Sulfate

Japanese: 硫酸アンモニウム - りゅうさんアンモニウム

Its chemical formula is (NH ₄ ) ₂ SO ₄ . Its specific gravity is 1.77, and its melting point is 513°C (in a sealed tube). It is also called ammonium sulfate. It is a colorless crystal that dissolves easily in water. When heated in air, it begins to decompose at 120°C and melts at 357°C, releasing ammonia. It is a typical nitrogen fertilizer. It is fast acting, but after the nitrogen is absorbed, sulfate ions remain as free sulfuric acid and calcium sulfate, which acidifies the soil, so urea is now used in greater quantities. Ammonium sulfate is divided into synthetic ammonium sulfate, recovered ammonium sulfate, and by-product ammonium sulfate according to the difference in the source of ammonia supply. Synthetic ammonium sulfate is the most common, obtained by neutralizing synthetic ammonia with sulfuric acid. It can also be synthesized using gypsum and sulfurous acid gas. Recovered ammonium sulfate is recovered from waste liquids during the production of caprolactam, a raw material for nylon. By-product ammonium sulfate is obtained by absorbing ammonia, a by-product of coal dry distillation at steelworks, into sulfuric acid, and is produced in small quantities. →Ammonia sulfate industry →Related items Acid fertilizer | Lime nitrogen | Compost | Nitrogen fertilizer

Source : Heibonsha Encyclopedia About MyPedia Information

Japanese:

化学式は（NH₄）₂SO₄。比重1.77，融点513℃（封管中）。硫安とも。無色の結晶で，水に易溶。空気中で熱すると120℃で分解を始め357℃でアンモニアを放って融解する。代表的な窒素肥料の一つ。速効性であるが，窒素分が吸収されたあとに硫酸イオンが遊離硫酸や硫酸カルシウムとして残り土壌は酸性化するため，現在では尿素のほうが使用量が多い。硫安は原料のアンモニア供給源のちがいにより合成硫安，回収硫安，副生硫安に分けられる。合成硫安は合成アンモニアと硫酸との中和で得られるもので，最も一般的。セッコウや亜硫酸ガスを利用して合成されるものもある。回収硫安はナイロン原料のカプロラクタム製造の際の廃液などから回収されるもの。副生硫安は製鉄所などでの石炭乾留に際して副生するアンモニアを硫酸に吸収させて得られるもので，生産量は少ない。→硫安工業
→関連項目酸性肥料｜石灰窒素｜堆肥｜窒素肥料

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