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    PRODUCTION OF OXIDE BY THERMAL DECOMPOSITION METHOD, SUCH OXIDE AND ITS USE
    1.
    发明专利
    PRODUCTION OF OXIDE BY THERMAL DECOMPOSITION METHOD, SUCH OXIDE AND ITS USE 失效

    公开(公告)号：JPH10212118A

    公开(公告)日：1998-08-11

    申请号：JP1114498

    申请日：1998-01-23

    Applicant: DEGUSSA

    Inventor： MANGOLD HELMUT DR ,  PLAMBECK-FISCHER PEER DR ,  PAULI INGO DR ,  JANZON KARLHEINZ DR

    IPC: C01G1/02 ,  C01B33/18 ,  C09K3/14

    Abstract: PROBLEM TO BE SOLVED: To obtain an oxide having improved polishing ability by specifying the amts. of hydrogen and oxygen in a gaseous starting material mixture in a central tube for producing an oxide by a thermal decomposition method. SOLUTION: When an oxide is produced by a thermal decomposition method, hydrogen existing in starting material or fed from the outside into a gaseous mixture for a burner is allowed to react with chlorine from a silicon-halogen compd. existing in the gaseous mixture to remove the chlorine as gaseous HCl. In order to attain this reaction, the ratio of hydrogen fed into the burner to stoichiometrically required hydrogen is regulated to

    Pyrogenic oxide, especially silicon di:oxide production
    3.
    发明专利
    Pyrogenic oxide, especially silicon di:oxide production 未知

    公开(公告)号：DE19756840A1

    公开(公告)日：1998-07-30

    申请号：DE19756840

    申请日：1997-12-19

    Applicant: DEGUSSA

    Inventor： MANGOLD HELMUT DR ,  PLAMBECK-FISCHER PEER DR ,  PAULI INGO DR ,  JANZON KARLHEINZ DR

    IPC: C01G1/02 ,  C01B33/18 ,  C09K3/14 ,  C01B33/14 ,  C09G1/02

    Abstract: A process for pyrogenic oxide production by high temperature flame hydrolysis employs a central tube raw material gas mixture which has a hydrogen ratio ( psi ) of less than 1 (preferably 0.7-0.9) and an oxygen ratio ( lambda ) of optionally less than 1 (preferably 0.7-0.9), where psi is the ratio of supplied hydrogen (including hydrogen from the raw materials) to the stoichiometrically required hydrogen and lambda is the ratio of supplied oxygen to the stoichiometrically required oxygen. Also claimed are: (i) a pyrogenic metal or metalloid oxide (preferably silicon dioxide) produced under the above conditions; (ii) a pyrogenic silicon dioxide produced by the above process and having a BET surface of 30-150 m /g and, when in the form of a 19% aqueous suspension, a viscosity of less than 2500 (preferably less than 1000) mPa.secs.; and (iii) a pyrogenic silicon dioxide produced by the above process and having a BET surface of 30-150 m /g and a fractal BET dimension of less than 2.605 (as determined by N2 adsorption in the pressure range p/p0 = 0.5 to 0.8, according to the fractal BET theory for multilayer adsorption by the method of Pfeifer, Obert and Cole, Proc. R. Soc. London, A 423, 169 (1989)).

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