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    Method for producing hydrophobic silica fine powder
    1.
    发明公开
    Method for producing hydrophobic silica fine powder 有权
    Verfahren zur Herstellung eines feinen crowben Siliziumdioxidpulvers

    公开(公告)号：EP1184425A1

    公开(公告)日：2002-03-06

    申请号：EP01307404.2

    申请日：2001-08-31

    申请人： SHIN-ETSU CHEMICAL CO., LTD.

    发明人： Nozawa, Yasuaki, c/o Gunma Complex ,  Shirasuna, Kiyoshi, c/o Gunma Complex ,  Uehara, Hidekazu, c/o Gunma Complex ,  Shibata, Keiji, c/o Gunma Complex ,  Ueno, Susumu, c/o Gunma Complex

    IPC分类号： C09C1/30

    CPC分类号： C09C1/3081 ,  C01B33/18 ,  C01P2006/12 ,  C01P2006/80 ,  C01P2006/90 ,  Y10T428/2993

    摘要： Hydrophobic silica fine powder is produced by pyrolyzing a silane compound to form a silica fine powder and hydrophobizing the silica fine powder with an organohalosilane as hydrophobizing agent in a fluidization vessel. A portion of the silica fine powder is bypassed to a waste gas line from the fluidization vessel and collected with a cyclone and bag filter, and the collected powder is fed to the fluidization vessel where it is hydrophobized. The amount of unreacted organohalosilane in the waste gases is reduced, alleviating the burden on waste gas treatment. The silica having the unreacted organohalosilane borne thereon is fed back to the fluidization vessel, increasing the reaction efficiency of organohalosilane.

    摘要翻译： 疏水性二氧化硅细粉末是通过将硅烷化合物热解形成二氧化硅细粉末，并将二氧化硅细粉末与作为疏水化剂的有机卤硅烷在流化槽中疏水化而制造的。 将二氧化硅细粉末的一部分从流化槽旁路到废气管线，并用旋风分离器和袋式过滤器收集，并将收集的粉末进料到流化槽中进行疏水化。 废气中未反应的有机卤代硅烷的量减少，减轻了废气处理的负担。 将其上承载有未反应的有机卤代硅烷的二氧化硅反馈给流化槽，提高有机卤代硅烷的反应效率。