Degussa Aktiengesellschaft

Other

Bayer Aktiengesellschaft

Uhde Gmbh

Deutsche Gold- Und Silber-scheideanstalt Vormals Roessler

Thyssenkrupp Industrial Solutions Ag

E.i. Dupont De Nemours and Company

Evonik Degussa Gmbh

Evonik Operations Gmbh

Degussa - Huls Ag

Momentive Specialty Chemicals Inc.

Thyssenkrupp Uhde Gmbh

Willi Hofen

Thomas Haas

Georg Thiele

Wolfgang Wöll

Bernd Jaeger

Guido Stochniol

Dietrich Arntz

Claudia Brasse

Rudolf Vanheertum

Norbert Ullrich

Joerg Sauer

Helmut Waldmann

Hermann Seifert

Ralf Goedecke

Stephan Rautenberg

Wolfgang Boeck

Rolf Wirthwein

Marc Brendel

J&ouml;rg Sauer

Bärbel Kolbe

Georg Boehme

Gerd Siekmann

Wolfgang W&ouml;ll

Gerd Schreyer

Gunter Prescher

Guenter Prescher

Raymund Sonnenschein

Rainer Siegmeier

Andreas Grund

Wolfgang Taugner

Michael Kleiber

Heinrich Petsch

Karl-Hermann Reissinger

Manfred Bärz

Jürgen Schemel

Hans-Christian Dietz

Percy Kampeis

Robert Franke

Herbert Klenk

Stefan Wieland

Wolfgang Swodenk

Johannes Kowoll

Lukas M Von Hippel

Werner Burkhardt

Christian Lettmann

David Bolz

Otto Weiberg

Manfred Dankowski

Hubertus Eickhoff

Jorg Krekel

Helmut Maurer

Peter Porscha

Werner Pohl

Niels Bredemeyer

Klaus Stadtmueller

Mathias Hoepp

Maik Bernhard

Joerg Lotz

Gunter Wolf

B&auml;rbel Kolbe

Alexander M&ouml;ller

Liane Deusser

Michael Dopfer

Karl-Ludwig Weber

Hans-Peter Ohlinger

Gerald Moroff

José Berges

Dana Pfenning

George Thiele

Wolfgang Woell

Stefan Pilz

Torsten Hahm

Klaus Stadtmuller

Robert Katzer

Karl Ludwig Weber

Guenther Prescher

Jörg Sauer

A process can be used for recovering 1-methoxy-2-propanol and 2-methoxy-1-propanol from an aqueous effluent stream by liquid-liquid-extraction, followed by extractive distillation, distillation of methoxypropanols from the extraction solvent, and distillative separation of the methoxypropanol isomers. Recovered extraction solvent is recycled to the extraction and extractive distillation. Heat transfer from recovered extraction solvent to the extract fed to the extractive distillation reduces energy demand of the process. A facility for this process contains a countercurrent extraction column, an extractive distillation column, a solvent recovery distillation column, an isomer separation distillation column, and a heat exchanger for transferring heat from recovered extraction solvent to the extract fed to the extractive distillation.

Process and facility for recovering methoxypropanols from an aqueous stream

In a process for the epoxidation of propene, comprising continuously reacting a propene feed with hydrogen peroxide in the presence of an epoxidation catalyst in a reaction step, using propene in excess to hydrogen peroxide, to provide a liquid reaction mixture comprising non-reacted propene, extra safety measures caused by the presence of oxygen during work-up of the liquid reaction mixture of the epoxidation reaction can be avoided by stripping liquid reaction mixture from step a) with an inert gas to provide an oxygen depleted stripped liquid reaction mixture and a strip gas stream, selecting the amount of inert gas to provide an oxygen concentration in the strip gas stream in the range of from 0.1 to 10% by weight, separating non-reacted propene from the strip gas stream and recycling it to the reaction step, and separating propene oxide from the stripped liquid reaction mixture.

Process for the epoxidation of propene

In a process for the epoxidation of propene, comprising the steps of reacting propene with hydrogen peroxide, separating propene oxide and a recovered propene stream from the reaction mixture, separating propane from all or a part of the recovered propene stream in a Csplitter column, and passing the overhead product stream of the Csplitter column to the epoxidation step, a propane starting material with a propane fraction of from 0.002 to 0.10 is used, the epoxidation is operated to provide a propane fraction in the reaction mixture of from 0.05 to 0.20 and the Csplitter column is operated to provide an overhead product stream which comprises a propane fraction of at least 0.04 in order to reduce the size and the energy consumption of the Csplitter column.

Propene is continuously reacted with hydrogen peroxide in a tube bundle reactor comprising a multitude of parallel reaction tubes in the presence of a titanium silicalite catalyst arranged as a fixed bed in the reaction tubes. A cooling jacket encloses the reaction tubes, which has a feed point for cooling medium near the entry of the reaction tubes, a withdrawal point for cooling medium near the end of the reaction tubes and at least one additional withdrawal point upstream of the withdrawal point near the end of the reaction tubes. Cooling medium is fed to the feed point for cooling medium, a part of the cooling medium is withdrawn at the at least one additional withdrawal point and the remainder exits at the withdrawal point near the end of the reaction tubes.

Process and reactor for the epoxidation of propene

The invention relates to a method for the production of epichlorohydrin, wherein a chloropropane-containing ally chloride in excess is reacted in a first reaction stage with hydrogen peroxide. The non-reacted ally chloride is separated and returned to the reaction, wherein part of the separated ally chloride is added to a second reaction stage and reacted with hydrogen peroxide, wherein the hydrogen peroxide quantity is selected in the second reaction stage such that the ally chloride is largely reacted. The chloropropanes are separated from the reaction mixture of the second reaction stage by means of distillation and removed from the process.

Method for the production of epichlorohydrin

A process for the catalytic epoxidation of olefins in the presence of a titanium containing zeolite catalyst and a polar solvent whereby the deactivation of the catalyst upon recycling of the solvent has been considerably reduced. In the process one or more nitrogen containing compounds are introduced at some stage, a solvent stream is recovered, treated to contain less than 50 wppm nitrogen in the form of organic nitrogen compounds and at least a part of it is recycled to the epoxidation step. Also disclosed is a process for the catalytic epoxidation of propene which integrates the treatment and recycle of the solvent into the workup of the reaction mixture.

Process for the epoxidation of olefins

A process for recovering methanol from mixtures containing methanol and water, comprising multistage evaporation with heat integration, wherein the pressure is reduced from each stage to the next, and a downstream series of distillation stages with heat integration, wherein the pressure is increased from each stage to the next. The process reduces the amount of energy required for methanol recovery.

Process for recovering methanol

A process for the epoxidation of olefins which includes

The invention relates to a process for increasing the selectivity of the hydrogenation of 4,4'-diaminodiphenylmethane (4,4&#x2032;-MDA) to diaminodicyclohexylmethane (4,4&#x2032;-HMDA) by catalytic hydrogenation of a mixture containing 4,4&#x2032;-MDA as the main component and its mono-N-methyl derivative as a secondary component. According to the invention, the hydrogenation is terminated before a conversion of 4,4&#x2032;-MDA to 4,4&#x2032;-HMDA of 99% is achieved. Under these conditions, a substantially smaller proportion of the N-methyl-4,4&#x2032;-MDA is hydrogenated to N-methyl-4,4-HMDA.

Process for increasing the selectivity of the hydrogenation of 4,4'-diaminodiphenylmethane to 4,4&#x2032;-diaminodicyclohexylmethane in the presence of an N-alkyl-4,4&#x2032;-diaminodiphenylmethane

A process for the purification of a crude propene oxide containing methanol and acetaldehyde by a continuously operated extractive distillation using an extraction solvent lowering the volatility of methanol and feeding a compound containing an unsubstituted NHgroup capable of reacting with acetaldehyde to a distillation column at a point above the feeding point of the crude propene oxide to give a purified propene oxide containing less than 100 ppm methanol and less than 100 ppm acetaldehyde. There is also disclosed a process for the catalytic epoxidation of propene that includes this purification stage.

Process for the purification of crude propene oxide

A process for the continuous epoxidation of propene with hydrogen peroxide in the presence of a titanium silicalite catalyst and a methanol solvent, wherein the catalyst is periodically regenerated by washing with a methanol solvent at a temperature of at least 100&#xb0; C. and the epoxidation reaction is carried out for periods of more than 300 h between two regeneration steps.

A continuous process for the epoxidation of olefins with hydrogen peroxide in the presence of a heterogeneous catalyst promoting the epoxidation reaction, whereby the aqueous reaction mixture contains i) an olefin; ii) hydrogen peroxide; iii) less than 100 wppm of alkali metals, earth alkali metals, both irrespective whether in ionic, complex or covalently bonded form, bases or cations of bases having a pkof less than 4.5, or combinations thereof; and, iv) at least 100 wppm of bases or cations of bases having a pkof at least 4.5 or combinations thereof, whereby the wppm are based on the total weight of hydrogen peroxide in the reaction mixture.

A process for the recovery of combustible components of a gas stream containing the combustible components and oxygen by selective absorption of the combustible components in a solvent, whereby during the absorption the gas phase is dispersed in a continuous liquid phase of the solvent. In a preferred embodiment the process is applied to give a process for the epoxidation of propene with hydrogen peroxide in the alcoholic solvent in presence of a catalyst, wherein a gas stream including unreacted propene, propene oxide and oxygen from the decomposition of the hydrogen peroxide is separated from the epoxidation reaction mixture and the combustible components in said gas stream are recovered using the process as described above.

Process for the recovery of combustible components of a gas stream

The invention described herein relates to a process for the catalytic epoxidation of olefins with hydrogen peroxide in a continuous flow reaction system, wherein a gaseous phase containing an olefin and a liquid phase containing the hydrogen peroxide is present in the reaction system and the gaseous phase flows in countercurrent to the liquid phase.

Process for the expoxidation of olefins

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Rodenbach, Germany

Willi Hofen