Ec Erdolchemie Gmbh

Bp Koln Gmbh

Bayer Aktiengesellschaft

Joachim Grub

Jens Herwig

Christian Gabel

Axel Gohrt

Stefan Kaminsky

Michael M&uuml;ller

Rolf Dieter Wurtz

Arnd St&uuml;we

Alexander Gammersbach

Arnd Stuwe

Hans-Joachim Kramer

Hans-Jurgen Bister

Werner Volprecht

Matthias Baum

Brian Schwegler

Stefanie Konig

Alfred Reimer

Arnd St{umlaut Over (u)}we

Stephan Muller

Bernd Hohmann

Jurgen Linnemann

Tertiary alcohols can be prepared by the hydration of tertiary olefins having the same number of carbon atoms on an acidic ion exchanger using special structured multi-purpose packings for heterogeneous reactive rectification. An excellent yield and purity of the alcohol and an extended service life of the catalyst are achieved.

Process for the preparation of tertiary alcohols by the hydration of tertiary olefins in a reactive rectification using a structured multi-purpose packing

The invention relates to a process for preparing diisobutylene (DIB) from an i-butene-containing C raffinate I, in which the C stream is passed through a first hydroisomerization reactor (A) and a fractionation column (B) and is thus largely freed of 1-butene and 2-butene. It is subsequently dimerized over an acidic catalyst installed in a reactive column (E). The feed stream to this reactive column contains not only i-butene but also butanes which make the reaction temperature in the fixed bed controllable by removal of the heat of reaction. In the fractionation column (B), a side stream can be subjected to a further hydroisomerization in a reactor (C).

Process for the selective preparation of DIB from an i-butene-containing C4 stream

A process is provided which makes it possible to separate off cyclic acetals from wastewater streams to a substantial extent, by passing the wastewater stream over a heterogeneous acid catalyst.

Process for removing cyclic acetals from wastewater streams

Process for isolating cyclopentane and/or cyclopentene

The production of 1,2-butadiene in purities of at least 85% becomes possible by means of a process in which a polymerization-inhibitor-containing C,hydrocarbon fraction is subjected to at least one fractional distillation.

Process for the production of 1, 2-butadiene

The present invention relates to silver-containing and optionally promoter-containing supported catalysts and catalyst intermediates, processes for their preparation and their use for preparing alkylene oxides by oxidation of alkenes with oxygen. The catalysts are prepared by treatment of a support with a lactic acid containing silver ions, nitrate ions and optionally promoter metal ions, drying, predecomposition in a virtually oxygen-free atmosphere and subsequent activation by heating in an oxygen-containing atmosphere while precisely controlling the temperature conditions and the feeding-in of oxygen. The catalyst intermediates obtainable by treatment, drying and only predecomposition can be activated in a temporally and physically separate process step to form the actual catalysts. Suitable promoters are alkaline earth metal compounds and/or alkali metal compounds. High activities and high selectivities are achieved when using the catalysts of the invention for preparing alkylene oxides.

Silver-containing supported catalysts and catalyst intermediates,

The effluent arising in the production of acrylonitrile can be purified by adjusting it to a pH value from 4 to 9 and then subjecting it to reverse osmosis at a membrane at a temperature from 10.degree. to 50.degree. C. and a differential pressure of 10 to 80 bar. The flow velocity at the membrane is adjusted to a value from 0.5 to 4 m/second. The concentrate is recycled into the acrylonitrile production process.

Process for purifying acrylonitrile effluent

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Dormagen, Germany

Joachim Grub