Method and apparatus for preparing and supplying catalyst slurry to a polymerisation reactor

Abstract

The present invention relates to an apparatus for preparing and supplying catalyst to an ethylene slurry loop polymerisation reactor and to an apparatus for controlling the injection of catalyst slurry in a polymerization reactor wherein polyethylene is prepared. The present invention a Iso relates to a method for optimising catalyst supply to a polymerisation reactor. The diluted catalyst is transferred to the reactor (1) using a membrane pump (5) controllable in function of the concentration of a reactant in said reactor (1).

Description

technical field [0001] The present invention relates to catalytic reactions. In a first aspect, the invention relates to an apparatus for preparing a catalyst slurry and supplying a polymerization reactor to a polymerization reactor. The invention also relates to a device for controlling the feed of catalyst to a polymerization reactor. In another aspect, the invention relates to a method for optimizing the supply of catalyst to a polymerization reactor. In another aspect, the invention relates to a method for controlling the feed of catalyst to a polymerization reactor. Background technique [0002] Polyethylene (PE) is polymerized by ethylene (CH 2 =CH 2 ) monomers and optionally higher 1-alkenes such as 1-butene, 1-hexene, 1-octene or 1-decene. Polyethylene polymers are used in many fields because polyethylene is cheap, safe, stable to most environments, and easy to process. According to the synthesis method, polyethylene can generally be classified into several typ...

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Problems solved by technology

[0013] However, although the above-mentioned methods of preparing dilute catalysts improve the control of the catalyst flow, they have the disadvantage that the catalyst flow rate cannot be adjusted reliably as a function of the reaction conditions in the polymerization reactor

In the latter case, however, attention is paid to the fact that the catalyst system used has maximum activity at the start of the polymerization, which may make it difficult to avoid a runaway reaction easily involving the formation of hot spots and formation of knots of molten polymer. piece

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