Basf Se Corporation

Karl Possemiers

Matthias Weismantel

Rüdiger Funk

Monte Alan Peterson

Robert Bayer

Oskar Stephan

Ronny De Kaey

Rudolf Schliwa

Jürgen Freiberg

Thomas Pfeiffer

Marco Krüger

Andreas Daiss

Dominicus Van Esbroeck

Leo Van Miert

Ruediger Funk

Gerald Gruenewald

Norbert Herfert

Stephan Bauer

Uwe Stueven

Filip Mees

Marco Krueger

Gerald Grünewald

Sylvia Bertha

Rene Callot

John Perry Guentzel

Sven Serneels

Norbert Eugen Voll

Juergen Freiberg

Markus Muehl

Tom Catternan

Koen Deboel

Jeffrey Johnson

Justin Martin

The invention relates to a process for producing superabsorbent polymer particles, comprising surface postcrosslinking, classifying the surface postcrosslinked superabsorbent polymer particles, deagglomerating the separated oversize fraction using a roll crusher and recycling the disintegrated oversize fraction before or into the classification of the surface postcrosslinked superabsorbent polymer particles.

Process for producing superabsorbent polymer particles

A process for producing superabsorbents, comprising the steps of i) classifying the superabsorbent particles by means of one or more sieves and ii) removing metallic impurities by means of one or more magnetic separators, wherein classification is accomplished using sieves made of a wire mesh, the wires of the wire mesh consist of a steel composed of at least 70% by weight of iron, at least 10% by weight of chromium and less than 2.5% by weight of nickel, and the throughput of superabsorbent particles in the magnetic separator is in the range from 2.0 to 6.5 g/s per cmof free cross-sectional area.

Method for the production of superabsorbers

The invention relates to an apparatus for producing pulverulent poly(meth)acrylate, comprising a reactor for droplet polymerization having an apparatus for dropletization of a monomer solution for the preparation of the poly(meth)acrylate having holes through which the monomer solution is introduced, an addition point for a gas above the apparatus for dropletization, at least one gas withdrawal point on the circumference of the reactor, a fluidized bed and an apparatus for product discharge from the fluidized bed. The apparatus for product discharge comprises a discharge apparatus, with a backup segment () disposed above the discharge apparatus.

Device for producing poly(meth)acrylate in powder form

A production process for production of water-absorbing polymer particles including drying an aqueous polymer gel in a belt drier with a conveyor belt. The belt drier is formed with a drier setup substantially comprising the conveyor belt and an air recycling conduit downstream of the drier setup for air recycling, where recycled air is withdrawn from the drier setup and fed back to the drier setup via the air recycling conduit.

Production method for producing water-absorbing polymer particles and belt dryer

An apparatus for addition of droplets of a monomer solution for production of poly(meth)acrylate to a reactor for droplet polymerization, comprising at least one channel or a dropletizer head having, at its base, holes through which the solution is dropletized into the reactor, at least one of the following features being fulfilled:

Apparatus for addition of droplets of a monomer solution to a reactor

An apparatus for introducing droplets of a monomer solution for production of poly(meth)acrylate into a reactor for droplet polymerization, comprising at least one channel or a dropletizer head, the channel or the dropletizer head being sealed at its base by a dropletizer plate, the dropletizer plate having holes through which the monomer solution is introduced into the reactor, and the dropletizer plate being configured such that holes that, in an axially symmetric dropletizer plate or in an annular dropletizer plate or in one configured as a ring segment, are not on a center line of the dropletizer plate or, in the case of a circular dropletizer plate, are not at the center of the dropletizer plate are aligned such that monomer solution is introduced through the holes into the reactor at an angle to the vertical, and the holes in the case of a radial alignment of axially symmetric dropletizer plates being aligned such that the angle at which the monomer solution is introduced into the reactor decreases in the direction of the axis of the reactor and, in the case of dropletizer plates arranged parallel to one another or of concentrically arranged dropletizer plates, each being aligned on a line parallel to the center line or line running concentrically about the center, such that the angle at which the monomer solution is introduced into the reactor is constant.

Apparatus for introduction of droplets of a monomer solution into a reactor

The present invention relates to a process for producing water-absorbent polymer particles by polymerizing droplets of a monomer solution in a surrounding heated gas phase in a reactor comprising a gas distributor (), a reaction zone () and a fluidized bed (), the gas leaving the reactor is treated in a condenser column () with an aqueous solution, the treated gas leaving the condenser column () is recycled at least partly to the fluidized bed (), wherein the gas leaving the condenser column () comprises from 0.05 to 0.3 kg steam per kg dry gas and the steam content of the gas entering the gas distributor () is less than 80% of the steam content of the gas leaving the condenser column ().

Process for producing water-absorbent polymer particles by polymerizing droplets of a monomer solution

A process for classifying water-absorbing polymer particles, wherein screens having different mesh sizes are used before and after surface postcrosslinking to remove the undersize (fines).

Process for classifying water-absorbing polymer beads

The invention relates to a process for producing water-absorbing polymer particles, comprising polymerization and drying the resulting polymer gel on a through-circulation belt dryer having at the end of the belt in transport direction a means for guiding the dried polymer gel down towards a means for crushing the dried polymer gel.

Process for producing water-absorbing polymer particles

A process for continuously preparing water-absorbing polymer beads, comprising the drying of a polymer gel on a forced-air belt dryer, the water content of the polymer gel being used to control the forced-air belt dryer during or after the drying.

Method for the continuous production of water absorbent polymer particles

A process for producing water-absorbing polymer particles by polymerizing an aqueous monomer solution in a polymerization reactor with at least two axially parallel rotating shafts, wherein the polymerization is performed in the presence of an inert gas and under positive pressure.

Process for producing water-absorbing polymer particles in a polymerization reactor with at least two axially parallel rotating shafts

The invention relates to a process for producing water-absorbing polymer particles, comprising thermal postcrosslinking in a contact dryer having external heated outer surfaces.

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Speyer, Germany

Karl Possemiers