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    • 12. 发明授权
    • Process for the preparation of cyclic polydiorganosiloxanes
    • 环状聚二有机硅氧烷的制备方法
    • US3989733A
    • 1976-11-02
    • US429272
    • 1973-12-28
    • Haruo OkamotoIsao Yanagisawa
    • Haruo OkamotoIsao Yanagisawa
    • C07F7/08C07F7/21
    • C07F7/0874C07F7/21
    • Cyclic polydiorganosiloxanes, in particular, cyclic trisiloxanes are continuously prepared from mixed polydiorganosiloxane, the starting material, by subjecting them to thermal cracking and rectification in a reactor composed of a column, vertically held, comprising a catalyst zone at the lower part in which the thermal cracking takes place to produce cyclic polydiorganosiloxanes and a rectification zone at the upper part in which the cyclic polydiorganosiloxanes are rectified into several fractions and a still positioned below the column. The cyclic polydiorganosiloxanes have structures different from the starting polydiorganosiloxanes.
    • 环状聚二有机硅氧烷,特别是环状三硅氧烷,通过在由垂直保持的塔构成的反应器中进行热裂解和精馏,从混合的聚二有机硅氧烷连续制备,该反应器在下部具有催化剂区,其中热 发生开裂以生产环状聚二有机硅氧烷和上部的整流区,其中环状聚二有机硅氧烷被整流成几个馏分,并且仍然位于塔的下方。 环状聚二有机硅氧烷具有不同于起始聚二有机硅氧烷的结构。