Basf Se Corporation

Basf Aktiengesellschaft

The Procter Gamble Company

Matthias Weismantel

Rüdiger Funk

Uwe Stueven

Marco Krüger

Ulrich Riegel

Thomas Daniel

Wilfried Heide

Stefan Blei

Monte Alan Peterson

Ruediger Funk

Juergen Schroeder

Leigh R Blair

Kevin D Heitzhaus

Volker Seidl

Reinhold Schwalm

Ulrich Hammon

Dominicus Van Esbroeck

Ronny De Kaey

Thomas Pfeiffer

Karl J Possemiers

Leo Van Miert

Jürgen Schröder

Annemarie Hillebrecht

Dennis Lösch

Karl Possemiers

Oskar Stephan

Dennis Loesch

Filip Mees

Volker Frenz

Gerald Grünewald

Sylvia Bertha

Fritz Engelhardt

Bernd Siegel

Mark Elliott

Francisco Javier Lopez Villanueva

Markus Braun

Thomas Gieger

Marco Krueger

Bruce Storey

Dieter Hermeling

Michael De Marco

Ulrich Schröder

Markus Linsenbühler

John Joseph Louden

Rene Callot

Norbert Herfert

Stefan Bruhns

John Perry Guentzel

Friedrich Engelhardt

Michael A Mitchell

Andreas Daiss

Thomas Jaworek

Antje Ziemer

R&uuml;diger Funk

Ann Becker

Andreas Popp

Koen Deboel

Giovanni Carlucci

Klemens Massonne

Brian Francis Gray

Rainer Dobrawa

Volker Braig

Achille Di Cintio

Martin Wendker

Monica Haag

Volker Klock

Kai Michael Exner

Andreas Brockmeyer

Roland Krauss

Holger Barthel

Klaus Dieter Hörner

Markus Linsenbuehler

Sven Serneels

Carolin Nadine Dücker

Norbert Eugen Voll

Gerald Gruenewald

Patrick Neal Hamilton

Meinhard Nitschke

Tom Catternan

Michael Fastner

Justin Martin

Frans Van Dyck

Domien Van Esbroeck

Louis Claessens

Karl-Friedrich Schneider

Jeffrey Johnson

Gregory Boykin

Sandra Engelhardt

Andrea Karen Bennett

Timo Baumgaertner

Peter Leunis

Michael Mitchell

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

A process for producing superabsorbent particles by polymerizing a monomer solution or suspension, comprising drying of the resultant aqueous polymer gel in an air circulation belt dryer, grinding, classifying, and optionally thermal surface postcrosslinking, wherein the aqueous polymer gel is introduced into the air circulation belt dryer by means of an oscillating conveyor belt and that guide devices are located at the edges of the conveyor belt.

Method for producing superabsorbent particles

A process for producing superabsorbent particles by polymerizing a monomer solution, comprising the steps of continuously polymerizing the monomer solution on the continuous belt of a belt reactor, comminuting the polymer gel obtained, rinsing the polymer gel obtained on the underside of the belt reactor into a separation unit with water, separating the polymer gel from the water in the separation unit and recycling the polymer gel into the comminution, wherein the polymer gel has a swelling capacity in water of at least 100 g/g, the dwell time of the polymer gel in the rinse water is less than 40 minutes, and the separation unit has openings with a clear width of at least 1 mm.

Method for the production of 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.

A process for producing superabsorbent particles by polymerizing a monomer solution or suspension, comprising the steps of continuously preneutralizing a monomer while cooling and partly recycling the preneutralized monomer into the preneutralization, continuously heating the preneutralized monomer by means of a heat exchanger and continuously postneutralizing the heated monomer, wherein the monomer solution or suspension prior to entry into the polymerization reactor is at a temperature of 70 to 99° C. and the temperature of the heating medium used in the heat exchanger is less than 160° C.

Method for the production of superabsorbers

A process for producing superabsorbent particles, comprising drying of a polymer gel, removal of incompletely dried polymer particles, comminution of the polymer particles removed, recycling of the comminuted polymer particles and storage of the recycled polymer particles.

Method for producing super absorber particles

A process for producing superabsorbent particles by polymerizing a monomer solution or suspension, comprising drying of the resultant aqueous polymer gel in an air circulation belt drier, grinding, classifying, and optionally thermal surface postcrosslinking, wherein the aqueous polymer gel is introduced into the air circulation belt drier by means of an oscillating conveyor belt, the underside of the revolving conveyor belt is freed of adhering polymer gel by means of at least one stripper device, and the underside of the revolving conveyor belt is sprayed with water.

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 heat exchanger for heating gas to a temperature in the range from 150 to 400° C., wherein the gas is heated by indirect heat transfer and all the surfaces of the walls of the heat exchanger which come into contact with the gas have been hot dip galvanized and the surfaces which come into contact with the gas, after the hot dip galvanization, have been heat treated at a temperature in the range from 400 to 750° C. The invention further relates to the use of the heat exchanger.

Heat exchanger for heating gas and use of the heat exchanger

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 belt drier arrangement for drying an aqueous polymer gel and for comminuting the dried polymer gel to give dried polymer particles, comprising:

Belt drier arrangement for drying an aqueous polymer gel and for comminuting the dried polymer gel to give dried polymer particles and process for drying an aqueous polymer gel and for comminuting the dried polymer gel to give dried 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.

A process for producing superabsorbents, comprising polymerization, drying, crushing, pneumatic conveying, comminuting and classifying, wherein the gas temperature at the end of the pneumatic conveying is from 50 to 95&#xb0; C.

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Jossgrund-Oberndorf, Germany

Matthias Weismantel