Patent ID: 8765898

Claim:
A process for producing water-absorbing polymer particles, comprising polymerization of a monomer solution or suspension, comprising a) at least one ethylenically unsaturated monomer which bears an acid group and may be at least partly neutralized, b) at least one crosslinker, c) at least one initiator, d) optionally one or more ethylenically unsaturated monomer copolymerizable with the monomer mentioned under a) and e) optionally one or more water-soluble polymer, drying, grinding, classifying the resulting polymer gel, and optionally thermally postcrosslinking, handling water-absorbing polymer particles in intermediate silos, storage silos, and/or big bag filing stations, wherein at least one vent line of at least one intermediate silo, storage silo, and/or big bag filing station has at least one bend for changing the direction of the vent line from upward to downward, the bend has a mitered joint and a slope upward and downward each of not less than 30° based on the horizontal.