Patent ID: 8563640

Claim:
A process for deaerating gas-containing aqueous fiber-containing liquid suspensions which are obtained in pulp production, and contain at least 70% by weight of water, comprising: adding to the liquid 0.0001 to 1.0% by weight based on the weight of the aqueous fiber-containing liquid suspensions of a mixture of 100 parts by weight of polypropylene glycol(s) having a mean molar mass (number average M n ) of 1000 to 8000 g/mol, and 1 to 200 parts by weight of branched polyether-polysiloxane copolymers in which the polyether radicals are SiC-bonded laterally to linear siloxane chains via hydrocarbyl radicals and where these linear siloxane chains are bonded to one another via lateral organic bridges.