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    Pyrogenic oxides and a process for their preparation
    1.
    发明专利
    Pyrogenic oxides and a process for their preparation 未知

    公开(公告)号：AU726460B2

    公开(公告)日：2000-11-09

    申请号：AU5270098

    申请日：1998-01-22

    Applicant: DEGUSSA

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

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

    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 ( gamma ) 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 gamma 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)).

    Pyrogenic oxides and a process for their preparation
    7.
    发明专利
    Pyrogenic oxides and a process for their preparation 未知

    公开(公告)号：AU5270098A

    公开(公告)日：1998-07-30

    申请号：AU5270098

    申请日：1998-01-22

    Applicant: DEGUSSA

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

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

    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 ( gamma ) 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 gamma 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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