Basf Aktiengesellschaft

Basf Coatings Ag

Basf Aktiengellschaft

Basf Se Corporation

Eberhard Fuchs

Tom Witzel

Rolf Hartmuth Fischer

Peter Bassler

Werner Schnurr

Gunther Achhammer

Johann-Peter Melder

Hermann Luyken

Frank Ohlbach

Karl-Otto Westphalen

Helmut Walter

Gerhard Hamprecht

Franz Merger

Rainer Becker

Matthias Gerber

Klaus Joachim Mueller-Engel

Boris Breitscheidel

Rolf-Hartmuth Fischer

Guido Voit

Klemens Flick

Dieter Baumann

Josef Ritz

Volker Hildebrandt

Hans Martan

Ralf Mohrschladt

Horst Zimmermann

Gerhard Nestler

Heinz-Peter Rink

Gunter Pipper

Karsten Eller

Klaus Joachim Müller-Engel

Stefan Rittinger

Claus-Ulrich Priester

Werner-Alfons Jung

Horst Neuhauser

Lutz Hilprecht

Guenther Achhammer

Bernd Fiege

Gu/ Nther Achhammer

Klaus P Stadler

Horst Nauhauser

Wolfgang Straehle

In a process for preparing water-absorbent resins based on acrylic acid, crude acrylic acid is firstly isolated from the reaction gases from the catalytic gas-phase oxidation of propane, propylene and/or acrolein. This is treated with an aldehyde scavenger and pure acrylic acid is separated by distillation from the treated crude acrylic acid, and this pure acrylic acid can be subjected directly to a free-radical polymerization.

Method for producing water-absorbent resins

A process prepares an aqueous alkali metal acrylate solution by distillatively removing acrylic acid from a mixture as vapors and taking up the vapors immediately from the gas phase into an aqueous alkali solution.

Method for producing an aqueous alkali acrylate solution

Preparation of caprolactam

Process for producing caprolactam

Shaped materials useful as catalyst for preparing cyclic lactams by reacting aminocarbonitriles with water in the liquid phase in a fixed bed reactor and which have no soluble constituents under the reaction conditions, comprising pyrogenic titanium dioxide as essential constituent, these compositions being obtainable by shaping the pyrogenic titanium dioxide into shaped articles and, before or after the shaping, treating the pyrogenic titanium dioxide with from 0.1 to 30% by weight, based on the pyrogenic titanium dioxide, of an acid in which pyrogenic titanium dioxide is sparingly soluble.

Pyrogenic titanium dioxide

The invention relates to polycondensation resins which are prepared by polycondensation of compounds having a low molecular weight and separation of small molecules in the presence of at least one hetergeneous catalyst. The invention also relates to polyaddition resins which are prepared by polyaddition in the presence of at least one heterogeneous catalyst. The invention further relates to the use of said polycondensation resins and polyaddition resins for the preparation of moulded parts, adhesives and coating materials.

Polycondensation resins and polyaddition resins produced by heterogeneous catalysis

In a process for producing polyamides by polymerization of lactams in the presence of metal oxides as heterogeneous catalysts, the metal oxides are used in a form which permits mechanical removal from the reaction mixture and are removed from the reaction mixture in the course of or on completion of the polymerization.

Method for producing polyamides

Continuous preparation of polyamides from aminonitriles

The disclosure is a process for preparing cyclic lactams of the formula I:

Method for producing cyclic lactams

Cyclic lactams are prepared by reacting aminocarbonitriles with water in the liquid phase in a fixed bed reactor in the presence of a catalyst which comprises a catalytically active oxide, which has no soluble constituents under the reaction conditions and which consists of shaped articles obtainable by shaping the oxide into shaped articles and, before or after said shaping, treating the oxide with from 0.1 to 30% by weight, based on the oxide, of an acid in which the oxide is sparingly soluble.

Caprolactam production process

A process for preparing a secondary or tertiary 2-methyl-1,5-pen-tanediamine of the formula I

Preparation of secondary and tertiary 2-methyl-1, 5-pentanediamines

Method for hydrogenating compounds from the group of imines or enamines

Process for simultaneously preparing caprolactam and hexamethylene

Carboxylic acid derivative preparation process

Growing community of inventors

Frankenthal, Germany

Eberhard Fuchs