Sulfur dioxide gas - sulfur gas

Japanese: 亜硫酸ガス - ありゅうさんガス

Its chemical formula is SO ₂ . Its specific gravity is 2.264 (air = 1), its melting point is -75.5°C, and its boiling point is -10.0°C. Sulfur dioxide. It is a colorless, toxic gas with a pungent odor. It dissolves in water to produce sulfurous acid. It has reducing properties and exhibits a bleaching effect when it is wet. It is used as a reducing agent and industrially as a raw material for the manufacture of sulfuric acid, for textile bleaching, and in the paper and pulp manufacturing process. It is naturally found in volcanic gases and mineral springs, and reacts with hydrogen sulfide to produce sulfur. In industry, it is produced by burning sulfide ores such as pyrite and chalcopyrite or sulfur. The gas irritates mucous membranes, and if it is concentrated, it can burn the throat and chest, causing breathing difficulties. It is found in the exhaust gases of oil- and coal-fired thermal power plants and factories, and has become a pollution problem. In Japan, flue gas desulfurization technology has been established, and sulfurous acid gas is removed and collected in accordance with the environmental standards set by the Basic Law for Pollution Control.
→ Related topics Sulfur | Mining pollution | Industrial poisoning | Smelting | Air pollution | Desulfurization

Source : Heibonsha Encyclopedia About MyPedia Information

Japanese:

化学式はSO₂。比重2.264（空気＝１），融点−75.5℃，沸点−10.0℃。二酸化硫黄。無色で刺激臭のある有毒気体。水に溶け，亜硫酸をつくる。還元性があり，水分があると漂白作用を示す。還元剤として用いられ工業的には硫酸の製造原料，繊維の漂白，紙パルプ製造工程などで使用。天然には火山ガス，鉱泉などに含まれ，硫化水素と反応して硫黄を生ずる。工業的には黄鉄鉱や黄銅鉱などの硫化鉱または硫黄を焼いてつくる。気体は粘膜を刺激し，濃ければのどや胸をいため呼吸困難となる。石油や石炭を燃料とする火力発電所や工場の排ガスなどに含まれ，公害問題となった。日本では排煙脱硫方式の技術が確立され，公害対策基本法による環境基準にしたがって亜硫酸ガスの除去回収が行われている。
→関連項目硫黄｜鉱害｜工業中毒｜製錬｜大気汚染｜脱硫

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