Basf Aktiengesellschaft

Basf Se Corporation

Manfred Winter

Andreas Kramer

Jacques Dupuis

Hagen Weigl

Michael Kroner

Roland Ettl

Hans-Joachim Haehnle

Claudia Nilz

Thomas Kessler

Andreas Stange

Ekhard Winkler

Rudolf Schuhmacher

Hans-Joachim Hähnle

Torsten Freund

Guenther Grimm

Thomas Knebel

Gerd Saas

Horst Schroeder

Wolfgang Schreieck

Reinhard Hoffmann

Gunther Grimm

Günther Grimm

Process for the preparation of N-vinylcarboxamides by pyrolysis of a compound of the formulaCH&#x2014;CH(CN)&#x2014;N(R)&#x2014;CO&#x2014;R&#x2003;&#x2003;(I),

Process for the preparation of N-vinylcarboxamides

A process for the hydrolysis of polymers comprising vinylcarboxamide units by heating polymers comprising vinylcarboxamide units in an aqueous medium in the presence of acids or bases, wherein an aqueous solution or dispersion of a polymer comprising vinylcarboxamide units and an aqueous solution or a base or acid are fed continuously to a tubular reactor at elevated pressure, from 0.05 to less than one equivalent of a base or acid being used per vinylcarboxamide equivalent and the mixture being passed through the tubular reactor at a temperature of &#x3e;100&#xb0; C. to 250&#xb0; C., depressurized and cooled.

Process for hydrolyzing polymers containing vinylcarboxamide units

A process for removing carbonaceous deposits on surfaces of catalysts and plant parts by treating the deposits with a superheated stream of steam admixed at least temporarily with an oxygenous gas is provided, which involves, in each case monitoring the offgas COcontent after condensation of the steam, at a temperature of at least 300&#xb0; C.: (a) treating the carbonaceous deposits with superheated steam at a temperature of at least 300&#xb0; C. until the COcontent of the offgas has exceeded a maximum; (b) then, with further supply of superheated steam, commencing oxygen supply, the amount of oxygen supplied being adjusted such that the COcontent in the offgas decreases further until it has fallen to a value of &#x3c;1% by volume; and then (c) ending the supply of superheated steam and passing an oxygenous gas over remaining amounts of carbonaceous deposits until the deposits have been virtually removed.

Process for removing carbonaceous deposits on surfaces of catalysts and plant parts

Process for the preparation of sulfuric acid monoesters of aminoalkanols by reacting sulfuric acid with aminoalkanols and removing the water forming in the reaction from the reaction mixture, sulfuric acid and at least one aminoalkanol being mixed and the hot reaction mixture forming being passed with turbulent flow into a container and being quenched therein with a fluid.

Process for preparing sulfuric monoesters from amino alkanols

A process for the preparation of alkyleneimines by subjecting sulfuric acid monoesters of aminoalkanols to an at least two-stage reaction with aqueous bases at a temperature of at least 110&#xb0; C. under pressure, relieving the pressure of the reaction mixture and distilling off the alkyleneimines from the reaction mixture after each reaction stage, wherein the conversion in the first stage is from 40 to 90% and that in the second stage is from more than 90% to 99.99%.

Continuous process for the preparation of alkyleneimines

Alkylketene dimers are prepared by reacting acyl chlorides with tertiary amines in a molar ratio of from 1:1 to 1:1.6 at from 65 to 150&#xb0; C. and with a residence time of from 1 to 30 minutes in the absence of solvents with thorough mixing and isolation of the alkylketene dimers.

Method for producing alkylketen dimers

A molding (catalyst structure) for chemical apparatuses which is formed from at least two closed frames and one or more cross-pieces connecting these frames, where the frames are arranged at a distance from one another in a single plane or in a plurality of parallel planes about an (imaginary) molding (structure) axis which is perpendicular to the plane(s) and passes through the center points of the frames. The molding (catalyst structure) is preferably formed from at least four closed frames and one or more cross-pieces connecting these frames, where the frames are arranged one inside the other at a distance from one another in at least two parallel planes about an (imaginary) molding (structure) axis which is perpendicular to the planes and passes through the center points of the frames, and each plane has at least two frames.

Catalyst structures

Preparation of aqueous solutions of polymers containing vinylamine

A process for the continuous distillation of thermolabile monomers under reduced pressure in a column includes

Continuous distillation of thermolabile monomers

In a process for the continuous distillation of thermolabile monomers under reduced pressure in the presence of formamide in a column,

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Dittelsheim-Hessloch, Germany

Manfred Winter