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    OXIDOS PIROGENOS DOPADOS CON POTASIO.
    23.
    发明专利
    OXIDOS PIROGENOS DOPADOS CON POTASIO. 未知

    公开(公告)号：ES2269275T3

    公开(公告)日：2007-04-01

    申请号：ES01125293

    申请日：2001-10-25

    Applicant: DEGUSSA

    Inventor： MANGOLD HELMUT DR ,  LORTZ WOLFGANG DR ,  GOLCHERT RAINER ,  ROTH HELMUT

    IPC: C01B13/20 ,  C01B13/34 ,  C01B13/24 ,  C01B33/18 ,  C09C1/30

    Abstract: Óxidos de metales o metaloides preparados por vía pirógena, dopados con potasio mediante un aerosol, caracterizados porque el componente de base es un óxido preparado por vía pirógena a modo de la oxidación ígnea o preferiblemente de la hidrólisis ígnea, que está dopado con potasio desde más de 0, 03 hasta 20 % en peso, estando situada la cantidad del dopaje preferiblemente en el intervalo de 500 a 20.000 ppm y siendo el componente de dopaje una sal de potasio, y la superficie según BET del óxido dopado esta situada entre 1 y 1.000 m2/g, y la amplitud de la distribución de tamaños de partículas es por lo menos de 0, 7.

    24.
    发明专利
    未知

    公开(公告)号：DE50110602D1

    公开(公告)日：2006-09-14

    申请号：DE50110602

    申请日：2001-10-25

    Applicant: DEGUSSA

    Inventor： MANGOLD HELMUT DR ,  LORTZ WOLFGANG DR ,  GOLCHERT RAINER ,  ROTH HELMUT

    IPC: C01B13/20 ,  C01B13/34 ,  C01B13/24 ,  C01B33/18 ,  C09C1/30

    Abstract: Pyrogenic oxides (A) of metals or metalloids, are doped with potassium by means of an aerosol. The base component is produced by flame oxidation or, preferably, flame hydrolysis, and is doped with 10 to 20 wt.%, preferably 1-20000 ppm potassium, supplied as a salt. (A) has BET surface area 1-1000 m /g and the width of the particle size distribution is at least 0.7. An Independent claim is also included for a process for preparing (A).

    Pyrogenic oxide, especially silicon di:oxide production
    29.
    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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