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    ALUMINIUM OXIDE POWDER PRODUCED BY FLAME HYDROLYSIS AND HAVING A LARGE SURFACE AREA
    1.
    发明公开
    ALUMINIUM OXIDE POWDER PRODUCED BY FLAME HYDROLYSIS AND HAVING A LARGE SURFACE AREA 有权
    具有大表面的热解法氧化铝粉末HERGESTELLES

    公开(公告)号：EP1694602A2

    公开(公告)日：2006-08-30

    申请号：EP04803356.7

    申请日：2004-11-30

    申请人： Degussa AG

    发明人： SCHUMACHER, Kai ,  GOLCHERT, Rainer ,  SCHILLING, Roland ,  BATZ-SOHN, Christoph ,  MÖRTERS, Martin

    IPC分类号： C01F7/30

    CPC分类号： C01F7/302 ,  C01P2002/01 ,  C01P2002/02 ,  C01P2002/72 ,  C01P2004/50 ,  C01P2006/10 ,  C01P2006/12 ,  C01P2006/19

    摘要： Aluminium oxide powder produced by flame hydrolysis and consisting of aggregates of primary particles, having a BET surface area of from 100 to 250 m2/g, a dibutyl phthalate absorption of from 50 to 450 g/100 g of aluminium oxide powder, which powder shows only crystalline primary particles in high-resolution TEM pictures. It is prepared by vaporising aluminium chloride, transferring the vapour by means of a carrier gas to a mixing chamber and, separately therefrom, supplying hydrogen, air (primary air), which may optionally be enriched with oxygen and/or may optionally be pre-heated, to the mixing chamber, then igniting the mixture of aluminium chloride vapour, hydrogen, air in a burner and burning the flame into a reaction chamber that is separated from the surrounding air, subsequently separating the solid material from the gaseous substances and then treating the solid material with steam and optionally with air, the discharge rate of the reaction mixture from the mixing chamber into the reaction chamber being at least 10 m/s, and the lambda value being from 1 to 10 and the gamma value being from 1 to 15. It can be used as an ink-absorbing substance in ink-jet media.

    PURIFICATION OF FINELY DIVIDED, PYROGENICALLY PREPARED METAL OXIDE PARTICLES
    3.
    发明公开
    PURIFICATION OF FINELY DIVIDED, PYROGENICALLY PREPARED METAL OXIDE PARTICLES 有权
    提纯精细分离的金属氧化物颗粒（PYROGENICALLY PREPARED METAL OXIDE PARTICLES）

    公开(公告)号：EP1656324A1

    公开(公告)日：2006-05-17

    申请号：EP04740148.4

    申请日：2004-06-22

    申请人： Degussa AG

    发明人： SCHUMACHER, Kai ,  FLESCH, Jürgen ,  HAMM, Volker

    IPC分类号： C01B33/18 ,  C01G23/07 ,  C01B13/14

    CPC分类号： C01F7/021 ,  C01B13/145 ,  C01B33/18 ,  C01G23/075 ,  C01P2006/12 ,  C01P2006/22 ,  C01P2006/80 ,  C01P2006/90

    摘要： Process for removing halide compounds adhering to finely divided metal oxide particles by means of steam, wherein the metal oxide particles are applied to the upper part of an upright column and migrate downwards by means of gravity, the steam is applied at the bottom end of the column, the metal oxide particles and the steam are fed counter-currently, the metal oxide particles freed of halide residues are removed at the base of the column, steam and halide residues are removed at the head of the column, wherein the column is heated in such a manner that the temperature difference Tbottom - Ttop between the lower part and the upper part of the column is at least 20°C and a maximum temperature of 500°C prevails in the column, and the metal oxide particles have a residence time in the column of from 1 second to 30 minutes.

    摘要翻译： 通过蒸汽去除附着于细碎的金属氧化物颗粒的卤化物的方法，其中金属氧化物颗粒被施加到立柱的上部并通过重力向下移动，蒸汽施加在立柱的底部 柱中，金属氧化物颗粒和蒸汽逆流进料，不含卤化物残余物的金属氧化物颗粒在塔底被除去，蒸汽和卤化物残余物在塔顶被除去，其中塔被加热 以这样的方式，塔的下部和上部之间的温度差Tbottom-Ttop至少为20℃，塔中的最高温度为500℃，并且金属氧化物颗粒具有停留时间 在1秒至30分钟的列中。

    TITANIUM DIOXIDE COATED WITH SILICON DIOXIDE
    4.
    发明公开
    TITANIUM DIOXIDE COATED WITH SILICON DIOXIDE 审中-公开
    与二氧化硅涂覆的二氧化钛

    公开(公告)号：EP1576061A2

    公开(公告)日：2005-09-21

    申请号：EP03813555.4

    申请日：2003-12-02

    申请人： Degussa AG

    发明人： SCHUMACHER, Kai ,  BATZ-SOHN, Christoph ,  HASENZAHL, Steffen

    IPC分类号： C09C1/36

    CPC分类号： C09C1/3661 ,  C01G23/07 ,  C01P2004/03 ,  C01P2004/84 ,  C01P2006/12 ,  C01P2006/90 ,  Y10T428/2993

    摘要： Powder consisting of particles with a core of titanium dioxide and a coating of silicon dioxide, which powder has a content of silicon dioxide of between 0.5 and 40 wt.%, a BET surface of between 5 and 300 m2/g, and which consists of primary particles that have a coating of silicon dioxide and a core of titanium dioxide. The powder is produced according to a process in which a vaporisable silicon compound and a vaporisable titanium compound are mixed corresponding to the subsequently desired ratio of SiO2 and TiO2 in the product, are vaporised at temperatures of 200°C or less, and conveyed by means of an inert gas stream together with hydrogen and air or with oxygen-enriched air to the central pipe (core) of a known burner, the reaction mixture is ignited at the mouth of the burner and introduced together with secondary air, is combusted in a cooled flame pipe, following which the titanium dioxide powder coated with silicon dioxide is separated from the gaseous reaction products and if necessary is freed in moist air from adhering hydrogen chloride, the ratio of primary air to secondary air being greater than 0.3, the ratio of core hydrogen to secondary air being greater than 1, and the ratio of titanium dioxide precursor to secondary air being greater than 0.5. Sunscreen agent containing the powder in an amount of between 0.01 and 25 wt.%.

    PYROGENICALLY PRODUCED SILICA
    5.
    发明公开
    PYROGENICALLY PRODUCED SILICA 无效
    气相二氧化硅

    公开(公告)号：EP1572586A1

    公开(公告)日：2005-09-14

    申请号：EP03767810.9

    申请日：2003-12-16

    申请人： Degussa AG

    发明人： MÖRTERS, Martin ,  JACOBSEN, Hauke ,  SCHUMACHER, Kai

    IPC分类号： C01B33/00

    CPC分类号： C01B33/183 ,  C01B33/12 ,  C01P2004/50 ,  C01P2004/62 ,  C01P2006/11 ,  C01P2006/12 ,  C01P2006/19 ,  C01P2006/90

    摘要： Pyrogenically produced silica powder with a BET surface of 30 to 90 m²/g, a dibutyl phthalate number of at least 80 and a tamped density of no more than 110 g/l. It is produced in that at least one vaporous silicon compound, a gas containing free oxygen and a combustible gas are mixed together in a closed burner and then burnt in a flame in the flame tube of the burner, the solid obtained is separated from the gas mixture and optionally purified, wherein the oxygen content of the gas containing free oxygen is adjusted such that the lambda value is greater than or equal to 1, and the gamma value is between 1.2 and 1.8. It can be used in toner applications.