Method for the production of highly pure nitric acid
    1.
    发明申请
    Method for the production of highly pure nitric acid 审中-公开
    生产高纯硝酸的方法

    公开(公告)号:US20050074389A1

    公开(公告)日:2005-04-07

    申请号:US10473212

    申请日:2002-03-27

    IPC分类号: C01B21/46 C01B21/44

    CPC分类号: C01B21/46

    摘要: In a new and improved process for preparing high-purity nitric acid by distillation or rectification of nitric acid, crude nitric acid or mixtures thereof in a column, 85-95% strength by weight nitric acid, crude nitric acid or a mixture thereof is distilled at from 70 to 110° C. and a pressure of from 0.1 to 2 bar.

    摘要翻译: 在一个新的和改进的方法中,通过蒸馏或精馏硝酸,粗硝酸或其混合物在塔中制备高纯度硝酸,蒸馏85-95%重量浓度的硝酸,粗硝酸或其混合物 70至110℃,压力为0.1至2巴。

    Material and method for lubricating the metal surfaces of an earth-pressure tunnel boring machine
    2.
    发明授权
    Material and method for lubricating the metal surfaces of an earth-pressure tunnel boring machine 失效
    用于润滑土压力隧道掘进机金属表面的材料和方法

    公开(公告)号:US06287052B1

    公开(公告)日:2001-09-11

    申请号:US08860624

    申请日:1997-05-28

    IPC分类号: E21D987

    摘要: A method of boring a tunnel with a tunnel boring machine comprising injecting into the formation to be bored just before the cutting tools of the boring machine and optionally into the internal discharge chamber of the boring machine, an aqueous foam containing at least one clay, at least one surfactant and at least one gas in proportion to produce a good quality, stable foam with the formation material and discharging the material from the tunnel via the discharge of the boring machine.

    摘要翻译: 一种用隧道掘进机钻孔隧道的方法,包括在钻孔机的切割工具之前喷射到要钻孔的地层中,并可选地进入钻孔机的内部排放室,含有至少一种粘土的含水泡沫, 至少一种表面活性剂和至少一种气体,以便产生与形成材料质量良好且稳定的泡沫体,并通过钻孔机的排放将材料从隧道排出。