| 摘要 |
The invention generally relates to a process for the continuous preparation of a water-absorbent polymer particle product, comprising the process steps of (i) preparing an aqueous monomer solution; (ii) optionally adding fine particles of a water-absorbent polymer to the aqueous monomer solution; (iii) adding a polymerization initiator or a at least one component of a polymerization initiator system; (iv) optionally decreasing the oxygen content of the aqueous monomer solution; (v) charging the aqueous monomer solution into a polymerization reactor; (vi) polymerizing in the polymerization reactor, thereby obtaining a polymer gel; (vii) discharging the polymer gel out of the polymerization reactor and optionally comminuting the polymer gel; (viii) drying the polymer gel in a first drying device; (ix) grinding the dried polymer gel in a first grinding device, thereby obtaining water-absorbent polymer particles; (x) sizing in a first sizing device; (xi) contacting with a crosslinking composition; (xii) drying in a further drying device; (xiii) sizing in a further sizing device, thereby obtaining a first fraction and a further fraction, (xiv) further grinding at least a part of the first fraction in a further grinding device, thereby obtaining a further ground first fraction; wherein in process step (xii) the further ground first fraction is recycled into the further drying device; wherein the further fraction comprises the water-absorbent polymer particle product. |
