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AssigneeBasell Polyolefine GmbH
InventorsPaulus De Lange, Volker Billert, Bernd Brunner, Werner Ritter, Andreas Deckers
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The invention relates to a method for the production of copolymer based on ethylene by continuous copolymerization of ethylene and comonomer in a reactor in the presence of a catalyst. In this method, in a first step of the copolymerization, a mixture comprising ethylene and comonomer of such a composition that a copolymer-containing coating deposits in the reactor is metered into the reactor and/or generated in the reactor, and, in a second step, the concentration of the comonomer in the metered-in mixture and/or in the mixture generated in the reactor is reduced sufficiently and/or the concentration of the ethylene in the metered-in mixture and/or in the mixture generated in the reactor is increased sufficiently that the coating is removed from the reactor either partially or completely. The method has the advantage that the production of copolymer does not have to be interrupted during cleaning of the reactor.
A method for producing a copolymer based on ethylene having a density of greater than or equal to 0.936 g/cm3 by continuous copolymerization of ethylene and comonomer in a reactor at temperatures of greater than or equal to 94.2° C. in the presence of a catalyst, where, in a first step of the copolymerization, a mixture comprising ethylene and comonomer of such a composition that a copolymer-containing coating deposits in the reactor is metered into the reactor and/or generated in the reactor, and, in a second step, the concentration of the comonomer in the metered-in mixture and/or in the mixture generated in the reactor is reduced and/or the concentration of the ethylene in the metered-in mixture and/or in the mixture generated in the reactor is increased, with the coating being removed from the reactor either partially or completely, even from narrowed regions of the reactor and a discharge system.
Dependencies are inferred from the claim text.