Basf Aktiengesellschaft

Basf Se Corporation

Juergen Schroeder

Matthias Weismantel

Ulrich Hammon

Ruediger Funk

Klaus Ebel

Joachim Thiel

Karl Possemiers

Volker Diehl

Volker Schliephake

Monte Alan Peterson

Ulrich Jaeger

Marco Krueger

Thomas Pfeiffer

Klaus Joachim Mueller-Engel

Gerhard Nestler

Ronny De Kaey

Albrecht Dams

Steffen Rissel

Hugues Vandenmersch

Rene Callot

Gerhard Wagenblast

Rüdiger Funk

Toni Dockner

Otto Machhammer

Sylke Haremza

Claus Hechler

Harald Keller

Uwe Stueven

Hans Rupert Merkle

Bernd Eck

Dominicus Van Esbroeck

Christoph Adami

Hans Martan

Frank Hoefer

Cedric Dieleman

Peter Zurowski

Carsten Groening

Michael Blechschmitt

Charles Schommer

Christian Rein

John Perry Guentzel

Matthias Geisendoerfer

Dimitrios Markopoulos

Tile Gieshoff

Filip Crauwels

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 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

A process for classifying water-absorbing polymer beads, wherein the polymer beads are separated into n particle size fractions by means of at least n screens and n is an integer greater than 1.

Method for grading water-absorbent polymer particles

A separating column containing a sequence of mass transfer trays that are supported by at least one covered double-T support and/or covered U-shaped support.

Thermal separating process

A process for rectificatively separating at least one (meth)acrylic monomer-containing fluid by feeding the fluid into a rectification column containing at least one sieve tray without a runoff segment, wherein

Method for the rectifying separation of fluids containing (meth)acryl monomers

A thermal separating process for removing a stream containing enriched (meth)acrylic monomers from a mixture containing (meth)acrylic monomers, in which the liquid phases retained in the separating space at high temperature and high (meth)acrylic monomer content are minimized.

Thermal separating process for removing at least one stream containing enriched (meth) acrylic monomers

A process for rectificatively separating fluids including (meth)acrylic monomers in a rectification column by directly cooling the vapor including (meth)acrylic monomers rising to the top of the rectification column to form top condensate including (meth)acrylic monomers, the condensation space at the top of the column being separated from the region of the rectification column containing the separating internals only by at least one chimney tray from which the top condensate formed is removed from the rectification column, which includes effecting the direct cooling of the vapor in the condensation space in at least two spray zones which are spatially successive and are flowed through by vapor by spraying supercooled top condensate including added polymerization inhibitor, and the temperature of the sprayed supercooled top condensate becoming lower from spray zone to spray zone in the flown direction of the vapor.

Rectificative separation of fluids comprising (meth) acrylic monomers

In process for cleaning tray columns which are used for the purposes of rectifiying liquids comprising (meth)acrylic compounds, a basic liquid is conveyed downward through the tray column and a gas is passed through the column in countercurrent to the basic liquid at an average gas phase differential pressure over all trays of at least 0.5 mbar/tray.

Cleaning of tray columns which have been used for rectificatively treating liquids comprising (meth)acrylic acid and/or esters thereof

A column for the thermal treatment of mixtures which contain one or more polymerizable compounds is proposed, which column has dual-flow trays with openings whose diameter is constant within a dual-flow tray, the dual-flow trays having openings of decreasing diameter with increasing distance from the feed of the mixture to be treated.

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Ludwigshafen, Germany

Juergen Schroeder