Axiva Gmbh

Aventis Research & Technologies Gmbh & Co Kg

Matthias Stumpf

R&uuml;diger Knauf

Herbert Neumann

Manfred Wolter

Hermann Berwe

J&uuml;rgen Hess

The invention relates to a process for separating off ethylene from a gas mixture comprising more than 8% by volume of carbon dioxide or oxygen, by gas permeation.

Ethylene treatment by gas permeation

The invention relates to a process for preparing carbonyl compounds from olefins and an oxidizing agent in which the olefin is oxidized in a reactor, a reaction gas mixture which comprises unoxidized olefin being formed, which comprises separating off unoxidized olefin at least in part from the reaction gas mixture by a membrane process.

Preparation of ethylene by gas permeation

The invention relates to a process for cooling polymerization reactors in the preparation of polyolefins, the polymerization being carried out in a first reactor and in at least one further reactor, the further reactor or reactors being connected downstream of the first reactor and each being cooled by an internal cooling circuit in which a cooling medium circulates. The invention comprises feeding cooling medium from the cooling circuit (,) of the first reactor (,) into the cooling circuit (,) of at least one further reactor (,) and taking off the same amount of cooling medium from the cooling circuit (,) of this reactor (,), cooling it and recirculating it into the cooling circuit (,) of the first reactor (,).

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Wiesbaden, Germany

Matthias Stumpf