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:''This is a historical article. For current information see Sodium hydroxide#Manufacture and Chloralkali process.'' Alkali manufacture is the process by which an alkali is made. Typical alkalis, produced commercially, include sodium hydroxide, sodium carbonate, potassium hydroxide and potassium carbonate. A number of processes have been proposed for the manufacture of alakali from various metals, the most common being the Leblanc and ammonia-soda processes. == The Leblanc Process == (詳細はNicolas Leblanc around 1790, begins with the decomposition of sodium chloride by sulfuric acid, by which sodium sulfate and hydrochloric acid are produced. The sodium sulfate is afterwards fired with calcium carbonate and coal. Sodium carbonate can be extracted from this mixture by washing the mixture with water. Until the rise of the ammonia-soda process, which has better economics, the Leblanc process was used extensively giving the United Kingdom a lead in alkali production. The UK's production outstripped that of all other producers combined., a trend still evident in modern times. Most of the British alkali works are situated in South Lancashire and the adjoining part of Cheshire, near the mouth of the Tyne and in the West of Scotland. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Alkali manufacture」の詳細全文を読む スポンサード リンク
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