Patent ID: 8333914
Filing Date: 2012-12-18
Classification: B01F,C01B,Y10T

Abstract:
1. A process for producing a dry liquid containing a droplet surrounded by a hydrophobic, pyrogenically prepared silica, which comprises stirring, in a container, the hydrophobic, pyrogenically prepared silica to be passed through a clearly defined, spatially limited shear zone of a rotor stator to avoid or suppress formation of dead zones, wherein the rotor stator has a circumferential velocity of 25 m/s or more, passing a liquid and the hydrophobic, pyrogenically prepared silica from the container through the clearly defined, spatially limited shear zone axially, wherein passage through the clearly defined, spatially limited shear zone results in the liquid being broken up into small droplets surrounded by the hydrophobic, pyrogenically prepared silica, and removing the small droplets from the clearly defined, spatially limited shear zone radially to give the dry liquid having a particle size distribution (cumulative undersize) as follows: