Ec Erdolchemie Gmbh

Bayer Aktiengesellschaft

Bp Koln Gmbh

Hans-Jurgen Bister

Arnd Stuwe

Jens Herwig

Werner Struver

Rudolf Wagner

Joachim Grub

Axel Gohrt

Herbert Tschorn

Alexander Gammersbach

Stefanie Konig

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

A catalytic agent for etherifying, hydrogenating and isomerizing crude C.sub.4 -C.sub.8 -- hydrocarbon mixtures having a sulfur content, comprising a macroporous or gel cation exchanger having SO.sub.3 H groups and being charged with a mixture of a metal selected from the group consisting of Pd, Ru, Rh and Pt with a metal selected from the group consisting of Fe, Co, Ni, Cu, Ag and W.

Catalyst agent for etherifying, hydrogenating and isomerizing crude      .

The i-butene present in a C.sub.4 raffinate I is subjected in a first step to a first hydroisomerization. The hydroisomerization product is subjected to fractional distillation, with essentially 2-butene and n-butane being obtained as bottom product and i-butene and i-butane being obtained as overhead product. The overhead product is condensed and the condensate is divided into two parts. One part is subjected to a second hydroisomerization and the second hydroisomerate is recycled to the upper third of the fractionation column. The other part of the condensed overhead product is fed to the oligomerization. The condensed overhead-product of the fractionation column is divided in such a manner that, based on 1 part by volume of condensate conducted to the oligomerization, 1-5 parts by volume are fed to the second hydroisomerization.

Process for oligomerizing I-butene comprising hydroisomerizing portion

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Neuss, Germany

Hans-Jurgen Bister