Basf Aktiengesellschaft

Basf Akteingesellschaft

Basf Se Corporation

Technische Universitat Kaiserslautern

Ome Technologies Gmbh

Ströfer, Eckhard

Eckhard Ströfer

Rolf Pinkos

Bernd Rumpf

Gerd Kaibel

Robert Baumann

Klaus Harth

Torsten Mattke

Markus Weber

Neven Lang

Achim Stammer

Christian Walsdorff

Hans Hasse

Bernd Sachweh

Markus Siegert

Gerhard Olbert

Christoph Sigwart

Joachim Thiel

Martin Sohn

Walter Dobler

Manfred Stroezel

Heiner Schelling

Ulrich Penzel

Ortmund Lang

Peter Pfab

Otto Watzenberger

Michael Bock

Joachim Pfeffinger

Thorsten Johann

Christoph Adami

Gerd-Dieter Tebben

Laszlo Szarvas

Andreas Wölfert

Andrea Haunert

Matthias Eiermann

Carsten Oost

Axel Franzke

Hans Volkmar Schwarz

Christian Müller

Jon S Speier

Radwan Abdallah

Martin Fiene

Thorsten Friese

Filip Deberdt

Franz Niklaus Windlin

Christian Kuhrs

Volker Krase

Volker Scharr

Sergej Blagov

Jan D Jacobs

Carsten Knösche

Karl-Heinz Wostbrock

Steffen Kerth

Bernd Gerber

Jan Jacobs

Jakob Burger

Heinz Krüger

Wilfried Seyfert

Olaf Schweers

Imbridt Murrar

Ludwig E Heck

Matthias Klötzer

Jan Peter Bredehöft

Hans-Jürgen Pallasch

Niklas Schmitz

Klemens Schilling

Gisbert Franzke

Stephan Scholl

Julia Leschinski

Jörn Karl

Jan-Oliver Drunsel

Byoung Yeon Kim

Andreas Schmidt

Häns-Jürgen Pallasch

Michael Ochse

A process for removing trioxane from a use stream I of formaldehyde, trioxane and water, by

Method for separating trioxane from a trioxane/formaldehyde/water mixture by means of pressure change rectification

An arrangement for carrying out chemical reactions comprises at least one distillation column and/or at least one container and at least one circulation evaporator, which are connected to one another via connecting elements, liquid being taken off completely or partly from a tray or from a stacked packing bed or from a dumped packing bed or from a liquid collector of the distillation column or being fed as an external feed stream below the lower tube sheet of the circulation evaporator to said evaporator.

Reaction column in a special combination with a natural circulation evaporator

A process is proposed for the distillation or reactive distillation of a mixture that includes at least one toxic component, the process being carried out in a column containing a structured packing, having at least one packing layer () having a lower end () and an upper end (), the packing layer having an internal geometry varying over its height, in such a manner that in the distillation or reactive distillation, in a first, lower region () of the packing layer () a bubbling layer having a predominantly disperse gas phase can be established and simultaneously in a second, upper region () of the packing layer () a film flow having a predominantly continuous gas phase can be established.

Method for carrying out the distillation or reactive distillation of a mixture containing at least one toxic constituent

A process for preparing formaldehyde by gas-phase oxidation of methanol vapor by means of a gas stream comprising molecular oxygen in the presence of a fixed-bed catalyst comprising iron and molybdenum, wherein the process is carried out in a reactor () having heat-exchange plates () which are arranged in the longitudinal direction of the reactor () and have a spacing between them and through which a heat transfer medium flows, inlet and outlet facilities () for the heat transfer medium to the heat-exchange plates () and also gaps () between heat-exchange plates () in which the fixed-bed catalyst is present and into which the methanol vapor and the gas stream comprising molecular oxygen are passed, is described.

Method for producing formaldehyde

A process for preparing a high-concentration formaldehyde solution by removing water from a lower-concentration formaldehyde solution having a formaldehyde content of from 5 to 50% by weight, in which the lower-concentration formaldehyde solution is fed to a preheater and heated in the preheater, depressurized via a pressure maintenance device and concentrated in a helical tube evaporator to give a vapor stream and the high-concentration formaldehyde solution as bottom stream, wherein the heated lower-concentration formaldehyde hyde solution is depressurized in the pressure maintenance device to give a two-phase mixture which is fed into the helical tube evaporator, is proposed.

Method for producing highly concentrated formaldehyde solution

A process for preparing methylenedianiline by reacting aniline with formaldehyde in the presence of acid catalysts comprising, in a semicontinuous process, introducing aniline with or without acid catalyst, feeding formaldehyde with or without acid catalyst through a mixing element into a circuit in which aniline with or without acid catalyst and with or without previously added formaldehyde is circulated and, after feeding in at least 50% of the total amount of formaldehyde to be fed in, heating the reaction mixture to a temperature above 75&#xb0; C. In addition, the invention relates to a process for preparing polyisocyanates by phosgenation of amines obtainable in this manner and to the polyisocyanates obtainable by this process.

Process for preparing methylenedianiline and methylenebis (phenylisocyanate)

In an aqueous formaldehyde solution comprising formaldehyde in the form of monomeric formaldehyde, methylene glycol and polyoxymethylene glycols in a total concentration x of &#x2267;65% by weight, the mean molar massof the polyoxymethylene glycols is, as a function of the formaldehyde concentration, equal to or less than the values given by equation I: where:

Highly concentrated formaldehyde solution, production and reaction thereof

A process for preparing a salt-free aqueous hydroxylamine solution by reacting an aqueous solution of a hydroxylammonium salt with a base to give a mixture and separating from said mixture by distillation a salt-free aqueous hydroxylamine solution, involving using as a base an aqueous solution of a mixture of NaOH and KOH in a molar ratio Na:Kin the range from 70:30 to 95:5 and with a total concentration of Naand Kin the range from 0.1 to 10 m/m % based on the total amount of the mixture.

Method for producing an aqueous hydroxylamine solution devoid of salt

The invention relates to a method for producing a highly pure, aqueous hydroxylamine solution by distilling an aqueous solution, devoid of salt, of a hydroxyl ammonium salt in a plate column comprising at least two mechanical plates. Said method is characterised in that packing bodies are arranged between at least two plates of the plate column over the cross-section of said column.

A process for preparing chlorine by catalytic gas-phase oxidation of hydrogen chloride over a fixed catalyst bed is disclosed that includes: making available a feed gas stream I with hydrogen chloride and an oxygen-containing feed gas stream II, feeding the feed gas stream I, the feed gas stream II, and, if desired, a recycled stream Ia with hydrogen chloride, an oxygen-containing recycle stream IIa, and a recycled stream III into an oxidation zone and oxidizing hydrogen chloride to chlorine in the presence of a catalyst present in a fixed bed to give product gas stream IV having chlorine, unreacted oxygen, unreacted hydrogen chloride and water vapor, and taking the recycled stream III from the product gas stream IV, without further treatment, and recirculating it to the oxidation zone, leaving a product gas stream IVa.

Fixed-bed process for producing chlorine by catalytic gas-phase oxidation of hydrogen chloride

A process for preparing a salt-free aqueous hydroxylamine solution by distilling an aqueous solution of a hydroxylammonium salt and a base in a tray column having at least two mechanical trays, wherein random or structured packings are located above at least one tray of the tray column over the cross section of the column.

Method for the production of a salt-free aqueous hydroxylamine solution

Process for preparing organic isocyanates, which comprises the steps

Integrated process for preparing isocyanates

Method for producing highly pure aqueous hydroxylamine solutions

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Mannheim, Germany

Eckhard Ströfer