Abstract: Improved utilization of organosilicon compounds in hydrophobicizing finely divided particulate solids is accomplished by metering a partial amount of unreacted solids with organosilicon containing offgases derived from admixing and reacting a major portion of solids with organosilicon compounds and admixing the offgas-treated solids with the major portion of solids to be treated.

Abstract: Improved utilization of organosilicon compounds in hydrophobicizing finely divided particulate solids is accomplished by metering a partial amount of unreacted solids with organosilicon containing offgases derived from admixing and reacting a major portion of solids with organosilicon compounds and admixing the offgas-treated solids with the major portion of solids to be treated.

Abstract: Particles having a relative viscosity or thickening effect ?relof more than 2, measured in a liquid medium having a viscosity of 1 Pas at a temperature of 25° C. and measured at a shear gradient of 10 s?1. The particles can form beds having a porosity ?>0.5 in a dry form.

Abstract: A large scale process for preparing fumed silica with consistent product parameters wherein a silica precursor compound is fed to a burner at ?100 Kg/h along with a combusting gas at ?300 m3/h and a combustible gas at ?100 m3/h, with a nozzle gas velocity between 10 and 200 m/s, and a radially symmetrical, homogenous gas velocity and gas temperature.

Abstract: A large scale process for preparing fumed silica with consistent product parameters wherein a silica precursor compound is fed to a burner at ?100 Kg/h along with a combusting gas at ?300 m3/h and a combustible gas at ?100 m3/h, with a nozzle gas velocity between 10 and 200 m/s, and a radially symmetrical, homogenous gas velocity and gas temperature.

Abstract: Particles having a relative viscosity or thickening effect ?rel of more than 2, measured in a liquid medium having a viscosity of 1 Pas at a temperature of 25° C. and measured at a shear gradient of 10 s?1. The particles can form beds having a porosity ?>0.5 in a dry form.

Abstract: A container with a top edge, a bottom edge and a rear side provided with a door, containing an inliner, wherein the inliner comprises at least two layers located one above the other, an inner layer consisting of uncoated, air-permeable fabric and an outer layer being coated so as to be dust-tight and to provide a moisture barrier, these layers being connected to one another by a special seam such that dust-free venting of the receptacle is possible only through this seam, the inliner being fastened in a reversible manner in the container and having at least one filling opening and an emptying opening.

Abstract: A silylated silica having an SiOH density per nm2 of less than 0.6, based on the BET-method surface area (DIN 66131 and 66132), is prepared by silylating silica in a process where loading, reacting, and purifying are performed in separate steps.

Abstract: A silylated silica having an SiOH density per nm2 of less than 0.6, based on the BET-method surface area (DIN 66131 and 66132), is prepared by silylating silica in a process where loading, reacting, and purifying are performed in separate steps.

Abstract: A large drum for containing high dispersion, high air content solids for repeated filling and emptying by means of vacuum filling plants and a method for filling them. The drums consist of at least two layers, an inner layer consisting of uncoated air-permeable fabric and an outer layer being coated so as to be dust tight and provide a moisture barrier. These layers being connected to one another by means of a special seam, so that it is possible for the drum to be deaerated solely through this seam. The seam includes an air-permeable dust-retaining filter strip material disposed between the drum layers.

Abstract: A process for preparing finely divided silica by reaction of gaseous or vaporizable silicon compounds in a mixture with gases forming water on combustion with air or oxygen in a flame includes producing discharges of gas in the combustion chamber by means of at least one gas gun. The apparatus for carrying out this process has applied to the outside of the combustion chamber wall at least one gas gun which produces a discharge of gas via an opening in the combustion chamber wall, preferably in conjunction with a nozzle on the inside of the combustion chamber wall.

Abstract: A method for the multiple filling and emptying of a receptacle with pourable product having low bulk density. The method comprises the following features:a) providing a flexible and air-permeable fabric container with at least one access port as a receptacle;b) filling the fabric container with product by applying a negative pressure to the fabric container and sucking the product through an opened access port into the fabric container, until a predetermined filling weight is reached, and closing the access port;c) emptying the fabric container, by connecting an access port to a discharge device and opening the access port and sucking the product into a conduit system or a reservoir until the fabric container is evacuated and has folded up; andd) closing the access port.