Patent ID: 7651719

Claim:
A process for the clarification of fermented unfiltered beer, comprising the steps of: providing an aqueous suspension of anionic colloidal silica having a neutral pH, which is stable over time and comprising individualized particles of colloidal silica which are not bound to one another by siloxane bonds, where said aqueous suspension of anionic colloidal silica comprising individualized particles of colloidal silica which are not bound to one another by siloxane bonds and having a basic pH in the range from 8.5 to 11, a specific surface in the range from 20 m 2 /g to 700 m 2 /g, mean particle diameter in the range from 4 nm to 150 nm and having a percentage of silica of ≧5 parts by weight, is mixed with an aqueous suspension of anionic colloidal silica comprising individualized particles of colloidal silica which are not bound to one another by siloxane bonds and having an acid pH in the range from 2 to 3.5, a specific surface in the range from 20 m 2 /g to 700 m 2 /g, a mean particle diameter in the range from 4 nm to 150 nm and having a percentage of silica of ≧5 parts by weight, further where the mean diameter of the particle is unchanged by the process; providing a fermented unfiltered beer; and contacting said aqueous suspension of anionic colloidal silica having a neutral pH with said fermented unfiltered beer.