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    • 34. 发明授权
    • Method for producing sodium tetraborate pentahydrate
    • 五水合四硼酸钠的制备方法
    • US4857286A
    • 1989-08-15
    • US68114
    • 1987-06-29
    • Paolo Mazzinghi
    • Paolo Mazzinghi
    • C01B35/12
    • C01B35/123
    • High-purity sodium tetraborate pentahydrate (Na.sub.2 B.sub.4 O.sub.7.5H.sub.2 O) is produced by:(a) reacting the mineral colemanite (2CaO.3B.sub.2 O.sub.3.5H.sub.2 O) with sodium carbonate (Na.sub.2 CO.sub.3) in an aqueous environment to produce an aqueous solution of sodium tetraborate and sodium hydroxide, with precipitation of solid calcium carbonate;(b) treating the aqueous solution obtained in stage (a), after separating the precipitated calcium carbonate, with boric acid (H.sub.3 BO.sub.3) to neutralize the sodium hydroxide and form a further quantity of sodium tetraborate;(c) separating sodium tetraborate pentahydrate by crystallization from the aqueous solution obtained in stage b.
    • 通过以下方法制备高纯度四硼酸钠五水合物(Na2B4O7.5H2O):(a)在含水环境中使矿物碳酸钙(2CaO.3B2O3·5H2O)与碳酸钠(Na2CO3)反应,生成四硼酸钠和氢氧化钠水溶液 ,固体碳酸钙沉淀; (b)用硼酸(H 3 BO 3)分离析出的碳酸钙后,处理阶段(a)中得到的水溶液中和氢氧化钠,形成更多量的四硼酸钠; (c)通过从阶段b获得的水溶液中结晶分离四硼酸钠五水合物。