Borealis Ag

Weickert, Günter

Günter Weickert

Klaus Nyfors

Erik A Eriksson

Vasileios Kanellopoulos

Erno Elovainio

Michiel Bergstra

Eric-Jan Prinsen

The present invention relates to a method for improving the cooling capacity of a gas solids olefin polymerization reactor by splitting the fluidization gas and returning part of the fluidization gas to the reactor into the bottom zone of the reactor and another part of the fluidization gas directly into the dense phase formed by particles of a polymer of the at least one olefin suspended in an upwards flowing stream of the fluidization gas in the middle zone of the reactor.

Method for improving the cooling capacity of a gas solids olefin polymerization reactor

The present invention relates to a process for polymerizing olefin monomer(s) in a gas solids olefin polymerization reactor wherein the fluidization gas is split and returned to the reactor into the bottom zone of the reactor and directly into the dense phase formed by particles of a polymer of the olefin monomer(s) suspended in an upwards flowing stream of the fluidization gas in the middle zone of the reactor.

Method of splitting the return fluidization gas in a gas solids olefin polymerization reactor

The invention relates to a reactor assembly for the production of polymers including a fluidized bed reactor () comprising a bottom zone (), a middle zone () and an upper zone (), an inlet () for the fluidization gas located in the bottom zone (), an outlet () for the fluidization gas located in the upper zone (); the outlet () for the fluidization gas being coupled with the fluidized bed reactor () via inlet (); the equivalent cross-sectional diameter of the bottom zone () being monotonically increasing with respect to the flow direction of the fluidization gas through the fluidized bed reactor; the middle zone () having an essentially constant equivalent cross-sectional diameter with respect to the flow direction of the fluidization gas through the fluidized bed reactor; the equivalent cross-sectional diameter of the upper zone () being monotonically decreasing with respect to the flow direction of the fluidization gas through the fluidized bed reactor; wherein that the ratio of the height of the fluidized bed reactor to the equivalent cross-sectional diameter of the middle zone of the fluidized bed reactor is from 2 to 10; and wherein there is an unobstructed passageway in the direction of flow of the fluidization gas through the fluidized bed reactor from the bottom zone () to the upper zone ().

Flexible reactor assembly for polymerization of olefins

Reactor assembly for the production of polymers including a fluidized bed reactor () comprising a bottom zone (), a middle zone () and an upper zone (), an inlet () for the fluidization gas located in the bottom zone (), an outlet () for the fluidization gas located in the upper zone (); the outlet () for the fluidization gas being coupled with the fluidized bed reactor () via inlet () via a gas circulation line; means for separation of solids from gas () being connected to said gas circulation line; the equivalent cross-sectional diameter of the upper zone () being monotonically decreasing with respect to the flow direction of the fluidization gas through the fluidized bed reactor; the middle zone () having an essentially constant equivalent cross-sectional diameter with respect to the flow direction of the fluidization gas through the fluidized bed reactor; the equivalent cross-sectional diameter of the bottom zone () being monotonically increasing with respect to the flow direction of the fluidization gas through the fluidized bed reactor; characterized in that the ratio of the height of the fluidized bed reactor to the equivalent cross-sectional diameter of the middle zone of the fluidized bed reactor is from 2 to 10; and whereby said upper zone () is directly connected to said middle zone ().

Growing community of inventors

Ahaus, Germany

Günter Weickert