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    • 8. 发明授权
    • TITANIUM DIOXIDE FINISHING PROCESS
    • 二氧化钛制造工艺
    • EP1954767B1
    • 2012-08-15
    • EP06827118.8
    • 2006-10-31
    • E.I. DU PONT DE NEMOURS AND COMPANY
    • DIEMER, Russell, Bertrum, Jr.EATON, Alan, RogerSUBRAMANIAN, Narayanan, SankaraTAYLOR, Stephen, WilliamSCHURR, George, A.ZIMMERMAN, David, A.
    • C01G23/07C01G23/08C09C1/36
    • C01G23/07B82Y30/00C01G23/075C01G23/08C01P2004/62C01P2004/64C01P2006/80C09C1/3607
    • This disclosure relates to process for producing titanium dioxide (TiO2) pigments, comprising the following steps: a) oxidizing a mixture of titanium tetrahalide and a rutile forming agent, such as aluminum halide, present in the vapor phase and in the presence of a nucleant to form a gaseous suspension comprising titanium dioxide particles; b) passing the gaseous suspension to a cooling conduit; c) introducing scouring material into the cooling conduit; wherein the particles of the scouring material have a diameter in the range of about 0.25 mm to about 12.7 mm; d) separating the vapor phase to form a powder comprising the titanium dioxide particles and the scouring material; and e) simultaneously subjecting the powder to substantially uniform heating at a temperature of about 3000C to about 6000C and reducing the size of the titanium dioxide particles and the particles of the scouring material in the powder to a mean particle size of about 50 nm to about 1000 nm, whereby the titanium dioxide pigment has a chloride content of less than about 500 ppm. The so treated powder may have a residual free chlorine content of less than about 1 ppm. The Figure is a simplified flow diagram of one embodiment of the process of the disclosure wherein feedstreams comprising oxygen, titanium tetrachloride, a nucleant and a rutile forming agent are introduced to an oxidation zone 10 wherein, in the vapor phase, the titanium tetrachloride is oxidized to form a gaseous suspension comprising titanium dioxide particles, the gaseous suspension is transferred to a cooling conduit 12 wherein the gaseous suspension is contacted with scouring material to form a cooled product having a solid phase and a vapor phase. The vapor phase is separated from the solid phase via separator 14 to form a powder comprising titanium dioxide particles and the scouring material which is passed to a particle size reducing unit 16. The powder withdrawn from the unit can be subjected to surface treating in finishing unit 18.
    • 9. 发明公开
    • TITANIUM DIOXIDE FINISHING PROCESS
    • 二氧化钛制造工艺
    • EP1954767A1
    • 2008-08-13
    • EP06827118.8
    • 2006-10-31
    • E.I. DU PONT DE NEMOURS AND COMPANY
    • DIEMER, Russell, Bertrum, Jr.EATON, Alan, RogerSUBRAMANIAN, Narayanan, SankaraTAYLOR, Stephen, WilliamSCHURR, George, A.ZIMMERMAN, David, A.
    • C09C1/36C09C3/04C01G23/047
    • C01G23/07B82Y30/00C01G23/075C01G23/08C01P2004/62C01P2004/64C01P2006/80C09C1/3607
    • This disclosure relates to process for producing titanium dioxide (TiO2) pigments, comprising the following steps: a) oxidizing a mixture of titanium tetrahalide and a rutile forming agent, such as aluminum halide, present in the vapor phase and in the presence of a nucleant to form a gaseous suspension comprising titanium dioxide particles; b) passing the gaseous suspension to a cooling conduit; c) introducing scouring material into the cooling conduit; wherein the particles of the scouring material have a diameter in the range of about 0.25 mm to about 12.7 mm; d) separating the vapor phase to form a powder comprising the titanium dioxide particles and the scouring material; and e) simultaneously subjecting the powder to substantially uniform heating at a temperature of about 3000C to about 6000C and reducing the size of the titanium dioxide particles and the particles of the scouring material in the powder to a mean particle size of about 50 nm to about 1000 nm, whereby the titanium dioxide pigment has a chloride content of less than about 500 ppm. The so treated powder may have a residual free chlorine content of less than about 1 ppm. The Figure is a simplified flow diagram of one embodiment of the process of the disclosure wherein feedstreams comprising oxygen, titanium tetrachloride, a nucleant and a rutile forming agent are introduced to an oxidation zone 10 wherein, in the vapor phase, the titanium tetrachloride is oxidized to form a gaseous suspension comprising titanium dioxide particles, the gaseous suspension is transferred to a cooling conduit 12 wherein the gaseous suspension is contacted with scouring material to form a cooled product having a solid phase and a vapor phase. The vapor phase is separated from the solid phase via separator 14 to form a powder comprising titanium dioxide particles and the scouring material which is passed to a particle size reducing unit 16. The powder withdrawn from the unit can be subjected to surface treating in finishing unit 18.
    • 10. 发明公开
    • SOLID FLOWABLE POWDER WITH HIGH LIQUID LOADING
    • 高液体负载的固体可流动粉末
    • EP1551570A2
    • 2005-07-13
    • EP03783052.8
    • 2003-08-14
    • E.I. DU PONT DE NEMOURS AND COMPANY
    • DALZIEL, Sean, MarkGAI, Pratibha, LaxmanFRIEDMANN, Thomas, EZHAO, Qian, QiuSCHURR, George, A.
    • B05D7/00
    • A61K9/143B01J2/006B82Y30/00
    • A process of manufacturing compositions comprised of carrier particles under 100 nm that have been loaded to a level of greater that 60% by weight with a liquid comprising metering the liquid into a flow restrictor, injecting a gas stream through the flow restrictor to atomize the liquid and create a zone of turbulence at the outlet end of a flow restrictor, and introducing particles through a hopper (28) into the zone of turbulence to mix the particles with atomized liquid thereby loading the particles with the liquid. The hopper (28) includes metering device for accurately metering the particles at a particular ratio to the liquid feed from liquid inlet line (16). The highly-liquid-loaded particles can be further coated or encapsulated with functional coating or encapsulating materials.
    • 制造由100nm以下的载体颗粒构成的组合物的方法,所述载体颗粒用液体加载至大于60重量%的水平,包括将液体计量加入限流器中,通过限流器注入气流以雾化液体 并在限流器的出口端产生湍流区,并通过漏斗(28)将颗粒引入湍流区以将颗粒与雾化液体混合,从而使颗粒与液体一起装载。 料斗(28)包括计量装置,用于以特定比率准确地计量颗粒与来自液体入口管线(16)的液体进料。 载有高度液体的颗粒可以进一步用功能性涂层或封装材料涂覆或包封。