Basf Se Corporation

Monte Alan Peterson

Matthias Weismantel

Rüdiger Funk

Norbert Herfert

Ronny De Kaey

Karl Possemiers

Ruediger Funk

Juergen Schroeder

Leo Van Miert

Thomas Pfeiffer

Dieter Hermeling

Oskar Stephan

Dominicus Van Esbroeck

Karl J Possemiers

Filip Mees

Annemarie Hillebrecht

John Perry Guentzel

Gerald Grünewald

Rene Callot

Sylvia Bertha

Norbert Eugen Voll

Carolin Nadine Dücker

Sven Serneels

Tom Catternan

Gerald Gruenewald

Patrick Neal Hamilton

Jeffrey Johnson

Gregory Boykin

Andrea Karen Bennett

Justin Martin

Steven Lippens

Frans Van Dyck

Michael Young

Tom Woodrum

William G-J Chiang

Peter Leunis

The invention relates to a process for producing superabsorbent polymer particles, comprising polymerization of a monomer solution, wherein the monomer solution comprises partly neutralized acrylic acid formed by continuous mixing of acrylic acid and an aqueous solution of a base, the apparatus for preparing the partly neutralized acrylic acid comprises a vessel (B), and the vessel (B) has a cylindrical shape and a torispherical bottom.

Process for producing superabsorbents

The invention relates to a process for producing superabsorbent polymer particles, comprising polymerization of a monomer solution, wherein the monomer solution comprises partly neutralized acrylic acid formed by continuous mixing of acrylic acid and an aqueous solution of a base, the apparatus for preparing the partly neutralized acrylic acid comprises a vessel (B), and the feed line to vessel (B) ends inside vessel (B) below the liquid Level of the partly neutralized acrylic acid.

The invention relates to a process for producing superabsorbent polymer particles, comprising storing acrylic acid in at least one tank (B) at a production site for acrylic acid and in at least one tank (B) at a production site for superabsorbent polymer particles, wherein the at least one tank (B) at the production site for acrylic acid and the at least one tank (B) at the production site for superabsorbent polymer particles are interconnected by one single pipe line () and the flow inside the pipe line () is temporary reversed during interruptions of the production superabsorbent polymer particles.

The invention relates to a process for producing superabsorbent polymer particles, comprising polymerization of a monomer solution, drying the resulting polymer gel and grinding the dried polymer gel with a roll mill, wherein the rolls of the roll mill are cleaned by reducing the feed rate to the roll mill, and if the deflection and/or the power consumption increases above a setpoint, operating the roll mill with reduced feed, and increasing the feed rate to the roll mill.

Process for producing superabsorbent polymer particles

The invention relates to a classification process for superabsorbent polymer particles, comprising classifying the water-absorbent polymer particles in a screen machine under reduced pressure wherein the pressure above the uppermost sieve is from 0 to 4.0 mbar per sieve higher than below the undermost sieve.

Classification process for superabsorbent polymer particles

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.

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 a process for producing water-absorbing polymer particles, comprising the steps of: &#x2022;&#x2014;processing an aqueous polymer gel from polymerization of a monomer solution or suspension, &#x2022;&#x2014;drying the aqueous polymer gel in a conveyer dryer, in particular in a forced air conveyer dryer, wherein &#x2022;&#x2014;the conveyer dryer has a circulating conveyer belt and the aqueous polymer gel is conveyed on the circulating conveyer belt, and wherein &#x2022;&#x2014;the circulating conveyer belt is formed as a circulating plate conveyer belt, comprising a number of belt plates separated by a hinge line of a hinge assembly and each belt plate having a surface for receiving the aqueous polymer gel, wherein said hinge assembly comprises a knuckle joint () with the hinge line in form of a straight hinge line.

Process for producing water-absorbing polymer particles

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, drying the resulting polymer gel on a through circulation belt dryer, crushing the dried polymer gel, pre-grinding, separating of incompletely dried particles with a perforated plate, grinding and classifying the resulting polymer particles.

A method for operating an apparatus with at least one rotating shaft, the at least one rotating shaft comprising functional elements which act on material to be processed in the apparatus, the apparatus comprising a filling orifice and an outlet orifice with an adjustable lower edge, and material being conveyed continuously through the apparatus from the filling orifice to the outlet orifice, said method comprising the following steps:

Method for operating an apparatus with at least one rotating shaft

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.

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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Freeport, TX, United States of America

Monte Alan Peterson