纯碱即碳酸钠，与烧碱（氢氧化钠）并称“两碱”，是重要的化工原料，广泛应用于轻工、纺织、冶金、建材、食品、化工等工业部门。两个世纪以来，工业制碱技术经历了一系列的变革，其间中国化工专家侯德榜的贡献尤为世人瞩目。人类很早就使用天然碱，不过产量有限。18世纪中叶 Soda ash, namely sodium carbonate, and caustic soda (sodium hydroxide) and said “two bases”, is an important chemical raw materials, widely used in light industry, textile, metallurgy, building materials, food, chemical and other industrial sectors. Over the past two centuries, industrial-scale alkaline technology has undergone a series of changes. In the meantime, the contribution made by the Chinese chemical expert Hou Debang has attracted worldwide attention. Tropsamine has long been used by humans but its production is limited. Mid-eighteenth century