Ec Erdolchemie Gmbh

Bayer Aktiengesellschaft

Bp Koln Gmbh

Ec Erdoelchemie Gmbh

Christian Gabel

Bernhard Schleppinghoff

Jens Herwig

Joachim Grub

Hans-Volker Scheef

Hans-Dieter Kohler

Arnd St&uuml;we

Michael M&uuml;ller

Rolf Dieter Wurtz

Peter M Lange

Alfred Mitschker

Mathias Lux

Arnd St{umlaut Over (u)}we

Bernd Hohmann

Jurgen Linnemann

Reiner Malessa

Hans-Ludwig Niederberger

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

Alkyl tert.-alkyl ethers can be cleaved into the underlying alkanols and tert.-olefins in the presence of strongly acidic substances in a column apparatus, the strongly acidic substance being made available at the foot of the column. A particularly advantageous process design results when a water stream is fed below the top column tray in countercurrent to the tert.-olefin flowing upwards and is taken off again from the column above the bottom circulation; in the case of using an insoluble, strongly acidic substance, the latter is located in a catalyst bed at the foot of the column, and the alkyl tert.-alkyl ether is preferably fed in between the catalyst bed and the bottom circulation evaporator.

Process for cleaving alkyl tert.-alkyl ethers

Tert.-olefins are obtained in high purity by cleavage of their alkyl ethers, when the catalysts used for this purpose are styrene/divinylbenzene resins which contain sulphonic acid groups and have a macroporous structure and the polymer matrix of which has an internal surface area of at least 400 m.sup.2 /g, a pore volume (porosity) of 0.6-2.5 ml/g and a mean pore diameter of 40-1000 .ANG.. These catalysts show long service lives.

Process for the preparation of tert.-olefins

Alkenes having a terminal double bond can be isomerized to give alkenes having an internal double bond if alkenes having a terminal double bond or hydrocarbon feedstock having a content of alkenes of this type having a terminal double bond are subjected to treatment, in the presence of hydrogen, over a macroporous or gel-like cation exchanger in the H.sup.+ form which contains 0.001 to 10 g of one or more metals of the VIth and/or VIIth and/or VIIIth sub-group of the periodic system of the elements in elementary form per liter of dry cation exchanger and which has a degree of crosslinking of 2 to 65% and a specific surface area of 5 to 750 m.sup.2 /g of dry exchange resin. The treatment is carried out in the liquid phase at a temperature from 0.degree. to 120.degree. C.

Process for the isomerization of alkenes having a terminal double bond

Tert.-Amyl alcohol (TAA) can be prepared in an advantageous manner by hydrating of i-amylenes on an acid cation exchanger by carrying out the reaction in the vicinity of the boiling point of the i-amylenes under the appropriate reaction pressure. A higher content of TAA is thereby obtained in the reaction mixture.

Process for the preparation of tert.-amyl alcohol (TAA)

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Dormagen, Germany

Christian Gabel