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    Method of modifying the surface properties of finely divided metal oxides
    1.
    发明授权
    Method of modifying the surface properties of finely divided metal oxides 失效
    改善细分金属氧化物表面性能的方法

    公开(公告)号：US3924029A

    公开(公告)日：1975-12-02

    申请号：US23851872

    申请日：1972-03-27

    Applicant: DEGUSSA

    Inventor： SCHUTTE DIETER ,  DIETHER JEAN ,  BRUNNER HELMUT

    IPC: C09C1/30 ,  B44D1/02

    CPC classification number: C09C1/309 ,  C01P2004/50 ,  C01P2004/60 ,  C01P2004/62 ,  C01P2006/10 ,  C01P2006/11 ,  C01P2006/12 ,  C01P2006/80 ,  C01P2006/82 ,  C01P2006/90

    Abstract: A process for producing hydrophobic finely divided fume silica which comprises the following steps in the specified sequence: A. FORMING, IN A FIRST REACTION ZONE, PARTICLES OF A FUME SILICA HAVING A SIZE OF LESS THAN APPROXIMATELY 150 MILLIMICRONS BY THERMAL DECOMPOSITION AND HYDROLYSIS IN THE VAPOR PHASE OF A VOLATILE SILICON HALIDE, THE SAID FUME SILICA PARTICLES HAVING AN ACIDITY CORRESPONDING TO A PH of approximately 2.0, and including a hydrogen halide and water adsorbed on their surfaces, B. PASSING THE THUS-PRODUCED FUME SILICA PARTICLES OUT OF THE SAID FIRST REACTION ZONE AND SUBJECTING THEM TO A DEACIDIFICATION AND DEHYDRATION PRETREATMENT TO REDUCE THEIR ACIDITY TO A VALUE CORRESPONDING TO A PH of approximately 4.0 by removing substantially all of the adsorbed hydrogen halide and water therefrom, C. PASSING THE THUS-PRETREATED PARTICLES OF FUME SILICA TOGETHER WITH WATER VAPOR INTO A SECOND REACTION ZONE INTO CONTACT WITH A STREAM OF HOT GASES CONTAINING SUBSTANTIAL PROPORTIONS OF AN ORGANOHALOSILANE WHILE THE SECOND REACTION ZONE IS MAINTAINED AT A TEMPERATURE BETWEEN APPROXIMATELY 400* AND APPROXIMATELY 800* C and the particles therein are maintained in a fluidized state and maintained therein for a period sufficient to convert them to hydrophobic fume silica particles, THE FOREGOING STEP, (C) OF THE PROCESS BEING PERFORMED IN THE ABDENCE OF MOLECULAR OXYGEN, AND D. SEPARATING AND RECOVERING THE HYDROPHOBIC FUME SILICA PARTICLES THUS PRODUCED FROM THE HOT GASES AND HYDROGEN HALIDE FORMED FROM THE ORGANOHALOSILANE WHILE STILL CONTINUING TO EXCLUDE MOLECULAR OXYGEN FROM CONTACT WITH THE PARTICLES UNTIL THE PARTICLES HAVE COOLED TO A TEMPERATURE BELOW 400* C.

    Abstract translation: 一种生产疏水性微粉煤灰的方法，其特征在于包括以下步骤：

    A process for the production of ultra-finely divided oxides
    3.
    发明专利
    A process for the production of ultra-finely divided oxides 未知

    公开(公告)号：GB1121279A

    公开(公告)日：1968-07-24

    申请号：GB5616667

    申请日：1965-07-28

    Applicant: DEGUSSA

    Inventor： BITTNER FRIEDRICH ,  BRUNNER HELMUT ,  SCHUTTE DIETER ,  DIETHER JEAN ,  SCHMITZ FRANZ THEO

    IPC: C01B13/22 ,  C01B33/18

    Abstract: Finely divided metal or silicon oxides are prepared by the vapour phase hydrolytic reaction of volatile metal or silicon halides in a flame into which the halide is introduced in admixture with oxygen and a gas whose combustion is accompanied by the formation of water, in such proportions that the mixture contains enough oxygen for the complete combustion of the flammable gas whilst the amount of water formed is at least sufficient to hydrolyse the volatile halide, said flame burning in an enclosed reaction zone and being surrounded by a gas inert to the reactions in the flame. In the diagram, the mixture of gases is fed to a burner 11 and the flame 12 burns in a flame tube 13 in an atmosphere of nitrogen supplied by a feed pipe 16 via a gauze 15. The air may be supplied to the burner in two streams, primary air supplied direct and supporting air bearing the metal halide.

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