The invention generally relates to a process for the preparation of water-absorbent polymer particles, comprising the process steps of (i) preparing an aqueous monomer solution comprising at least one partially neutralized, monoethylenically unsaturated monomer bearing carboxylic acid groups (α1) and at least one crosslinker (α3) (ii) optionally adding fine particles of a water-absorbent polymer to the aqueous monomer solution (iii) adding a polymerization initiator or at least one component of a polymerization initiator system to the aqueous monomer solution (iv) optionally decreasing the oxygen content of the aqueous monomer solution (v) charging the aqueous monomer solution into a polymerization reactor (vi) polymerizing the monomers, thereby obtaining a polymer gel (vii) discharging the polymer gel out of the polymerization reactor and optionally comminuting the polymer gel (viii) drying the optionally comminuted polymer gel (ix) grinding the dried polymer gel thereby obtaining water-absorbent polymer particles (x) sizing the grinded water-absorbent polymer particles and (xi) optionally treating the surfaces of the grinded and sized water-absorbent polymer particles wherein in process step (i) preparing the aqueous monomer solution comprises: (i1) providing a first portion of acrylic acid and (i2) contacting the first portion of acrylic acid with a hydroxide in a first contacting step, thereby obtaining a first acrylate phase and (i3) contacting the first acrylate phase with a further portion of acrylic acid in a second contacting step, thereby obtaining the monomer solution.De manière générale, linvention concerne un procédé pour la préparation de particules polymères absorbant leau, comprenant les étapes de procédé (i) de préparation dune solution aqueuse de monomères comprenant au moins un monomère partiellement neutralisé, monoéthyléniquement insaturé, portant des groupes acide carboxylique (alpha 1) et au moins un agent de réticulation (alpha 3) (ii) évent
