Oxea Corporation

Celanese Chemicals Europe Gmbh

Hoechst Aktiengesellschaft

Oq Chemicals Corporation

Kurt Schalapski

Heinz Strutz

Peter Heymanns

Norman Nowotny

Ernst Wiebus

Matthias Eisenacher

Dirk Bermann

Helmut Bahrmann

Guido D Frey

Rainer Lukas

Richard Fischer

Peter Lappe

Hans Bohnen

Carl Dieter Frohning

Wolfgang Greb

Wilhelm Gick

Jürgen Herwig

Wolfgang Zgorzelski

Thorsten Kreickmann

Klaus Bergrath

Leif Johnen

Michael Riedel

Wilfried Fenske

Robert Eckl

Florian Rampf

Wolfgang Zgorzel-Ski

Rolf-Peter Schulz

Sebastian Geisel

Jörg Arnold

Tonia Weber

Donald K Raff

Heinz Kalbfell

Harald Kappesser

Wolfgang Hofs

Christoph Balzarek

Horst Scholz

Dieter Frohning

Gregor Meier

Alexander Kaufmann

Mark Hewlett

Joachim Reimer

Wolfgang Höfs

Norman Nowotney

Thomas Krumrey

Robert Rapier

John Steinbach

Bak Shah

Jan-Henry Rahe

Michael Mertl

Tonia Kretz

Jan Henry Rahe

Marcel Musenbrock

Thomas Hupperich

Gregor Konietzny

The present invention relates to a process for continuous production of C4-C10 Diols from C3-C9 aldehydes comprising the process steps of: a) base-catalyzed addition of formaldehyde onto C3-C9 aldehydes to obtain the corresponding hydroxyaldehydes and b) subsequent hydrogenation of the hydroxyaldehydes to afford the corresponding diols, wherein the hydrogenation of the hydroxyaldehydes is performed continuously in the liquid phase over a Raney™ cobalt catalyst in the presence of hydrogen without workup of the reaction mixture from the process step a).

Method for continuously producing diols from aldehydes by means of Raney cobalt catalysis

The present invention relates to the continuous production of 2-methylene alkanals in a tube reactor, wherein in the 2-position non-branched alkanals are reacted with formaldehyde under acid-base catalysis in the presence of secondary amines and carboxylic acids under laminar flow conditions.

Continuous production method for 2-methylene alkanals

Distillative process for obtaining ditrimethylolpropane from solutions includes separating ditrimethylolpropane from the solution in a first distillation unit into a first tops fraction comprising low-boiling compounds having a lower boiling point than ditrimethylolpropane and a first bottoms fraction; introducing the first bottoms fraction into a second distillation unit having at least 5 theoretical plates, said unit being configured as a thin-film evaporator with a column attachment and drawing off a second tops fraction comprising intermediate-boiling compounds having a lower boiling point than ditrimethylolpropane as well as withdrawing a second bottoms fraction from the second distillation unit and introducing the second bottoms fraction into a third distillation unit having at least 4 theoretical plates, said unit being configured as a thin-film evaporator with a column attachment, such that ditrimethylolpropane is obtained as a third tops fraction and high boilers are removed as a third bottoms fraction.

Method for recovering di-trimethylolpropane by distillation

A method for preparing neopentyl glycol by addition of isobutyraldehyde and formaldehyde in the presence of a tertiary alkylamine as catalyst to give hydroxypivalaldehyde with subsequent hydrogenation at a temperature of 80 to 140&#xb0; C. and at a pressure of 2 to 18 MPa in the liquid phase, is characterized in that the hydrogenation is carried out in the presence of a copper chromite catalyst comprising the activators barium and manganese.

Method for the production of neopentyl glycol

The present invention relates to a continuous, catalytic process for preparing a vinyl ester of the formula R&#x2014;C(O)O&#x2014;CH&#x2550;CHby reaction of a carboxylic acid of the formula R&#x2014;C(O)OH with a transvinylating reagent of the formula R&#x2014;C(O)O&#x2014;CH&#x2550;CH, wherein the reaction is effected at a temperature of 90 to 160&#xb0; C. and at a pressure of 0.5 to 15 MPa without withdrawal of a reactant in the presence of a transition metal catalyst containing at least one transition metal from the group of ruthenium, osmium, rhodium, iridium, palladium and platinum, and then the resulting reaction mixture is separated into its constituents.

Method for producing vinyl esters

A continuous method for preparing neopentyl glycol by addition of isobutyraldehyde and formaldehyde in the presence of a tertiary alkylamine as catalyst to give hydroxypivaldehyde with subsequent hydrogenation in the gas phase at a temperature of 125 to 180&#xb0; C., is characterized in that the hydrogenation is carried out in the presence of a copper chromite catalyst comprising the activators barium and manganese and at a superatmospheric pressure of 30 to 120 kPa.

Continuous method for the production of neopentyl glycol

Process for obtaining ditrimethylolpropane and trimethylolpropane-enriched product streams from the high-boiling fractions and residues which are obtained in the distillative purification of trimethylolpropane includes three stage distillation characterized in that second and third stages are configured as thin film evaporators with a column attachment with the second stage facilitating trimethylopropane recovery and the third stage facilitating ditrimethylolpropane recovery.

Method for recovering di-trimethylolpropane and trimethylolpropane-enriched product streams from the side streams of trimethylolpropane production

A continuous process for preparing primary aliphatic amines having 3 to 18 carbon atoms by reacting corresponding aliphatic aldehydes with ammonia and hydrogen in the presence of a hydrogenation catalyst, characterized in that the reaction is carried out without solvent at a molar ratio of aliphatic aldehyde to ammonia of more than 1 to 16, above the critical temperature and above the critical pressure of ammonia.

Continuous method for producing primary aliphatic amines from aldehydes

The invention relates to a continuous method for carrying out a multiphase aldol condensation reaction to obtain mixed &#x3b1;,&#x3b2;-unsaturated aldehydes by reacting a mixture of two aliphatic aldehydes having different numbers of carbon atoms, i.e. 2 to 5, in the molecule in a vertical tubular reactor in a concurrent flow in the presence of an aqueous solution of a basically reacting compound. In said method, the aldehyde mixture is dispersed in the aqueous phase in the form of drops, and the aqueous solution of the basically reacting compound flows through the tubular reactor as a continuous phase in laminar conditions.

Method for carrying out multiphase aldol condensation reactions to give mixed &#x3b1;, &#x3b2;-unsaturated aldehydes

A continuous process for producing primary aliphatic amines having 9 to 18 carbon atoms by reaction of corresponding aliphatic aldehydes with ammonia and hydrogen in the presence of a hydrogenation catalyst in the liquid phase, characterized in that the reaction is carried out solventlessly at a molar ratio of aliphatic aldehyde:ammonia of at least 1:30, at a temperature of 100 to 200&#xb0; C. and at a pressure of 6 to 11 MPa.

Method for producing primary aliphatic amines from aldehydes

The present invention relates to a method of producing neopentyl glycol by addition of isobutyraldehyde and formaldehyde in the presence of a tertiary alkylamine as catalyst to give the hydroxypivalinaldehyde with subsequent liquid phase hydrogenation in the presence of a nickel catalyst at a temperature of 80 to 180&#xb0; C. and at a pressure of 6 to 18 MPa in the presence of an aliphatic alcohol and in the presence of water.

Method of producing neopentyl glycol

The present invention relates to a process for obtaining neopentyl glycol by hydrogenating cracking of high-boilers occurring in the production process in the presence of copper-chromite catalysts. The hydrogenating cracking proceeds in the absence of solvent at a temperature of 140 to 220&#xb0; C. and at pressures of 7 to 28 MPa.

Process for preparing neopentyl glycol by cracking high boilers occurring in the production process

A process for preparing sulfonated arylphosphines by reaction of arylphosphines with oleum, wherein, after reaction of the arylphosphines with oleum, the sulfonation mixture is firstly diluted with water, an inert gas stream is then passed through the diluted sulfonation mixture until SOis no longer liberated from the diluted sulfonation mixture and the latter is then worked up further in a customary manner and its use.

Process for preparing sulfonated arylphosphines

The invention relates to a hydroformylation method, whereby the homogeneous liquid reactor discharge is first supplied to a gas/liquid separator and then run through an extraction column with a counter-current of synthesis gas and finally fed to an evaporator. The invention is characterised in that the homogeneous liquid mass flow is supplied to the upper section of the extraction column at a temperature above 90&#xb0; C.

Method for the production of aldehydes

According to the invention, rhodium is recovered from hydroformylation products (feed material) by thermally processing the feed material in the presence of an adsorbent and, optionally, with the additional action of hydrogen.

Method for recovering rhodium from hydroformylation products

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Oberhausen, Germany

Kurt Schalapski