In the high pressure polymerization of ethylene homopolymers or copolymers, conditions in the high pressure recycle system may lead to the build-up of low molecular weight oligomers and waxes. Sequentially draining knock-out pots, located downstream of a high pressure separator, at regular intervals can reduce the build-up of low molecular weight oligomers and waxes during the high pressure polymerization of alpha olefins.

Provided is a method of manufacturing an ethylene-acrylic acid copolymer including the step of (S1) supplying an ethylene monomer and an acrylic acid comonomer to a polymerization reactor to manufacture an ethylene-acrylic acid copolymer; (S2) supplying an acrylic acid comonomer-containing mixture discharged from a front or rear end of the polymerization reactor and a cleaning solvent to a cleaning unit; and (S3) dissolving an polyacrylic acid derived from the acrylic acid comonomer contained in the mixture in the cleaning solvent. The cleaning solvent includes a polyhydric alcohol-based solvent.

A process for polymerizing or copolymerizing ethylene in a slurry polymerization in a reactor system including a polymerization reactor, one or more first heat exchangers located outside the polymerization reactor, and a closed loop of a tempering medium for cooling or heating the first heat exchangers, which closed loop is equipped with second heat exchangers for cooling the tempering medium and third heat exchangers for heating the tempering medium, and wherein, during the polymerization, the slurry is cooled in the first heat exchangers, the temperature of the tempering medium cooling the first heat exchangers is in the range from 20 C. to 50 C., and the tempering medium is cooled in the second heat exchangers by a coolant, having a temperature from 20 to 45 C.

A process for polymerizing or copolymerizing ethylene in a slurry polymerization in a reactor system including a polymerization reactor, one or more first heat exchangers located outside the polymerization reactor, and a closed loop of a tempering medium for cooling or heating the first heat exchangers, which closed loop is equipped with second heat exchangers for cooling the tempering medium and third heat exchangers for heating the tempering medium, and wherein, during the polymerization, the slurry is cooled in the first heat exchangers, the temperature of the tempering medium cooling the first heat exchangers is in the range from 20 C. to 50 C., and the tempering medium is cooled in the second heat exchangers by a coolant, having a temperature from 20 to 45 C.

The present technology relates to a method of introducing a supported antistatic compound that does not comprise a transition-metal-based catalyst component for use in an olefin polymerization reactor. In some embodiments, the methods disclosed herein avoid the formation of polymer agglomerates in the reactor and minimize potentially negative effects on catalyst yield.

The present technology relates to a method of introducing a supported antistatic compound that does not comprise a transition-metal-based catalyst component for use in an olefin polymerization reactor. In some embodiments, the methods disclosed herein avoid the formation of polymer agglomerates in the reactor and minimize potentially negative effects on catalyst yield.

The present technology relates to a method of introducing a supported antistatic compound that does not comprise a transition-metal-based catalyst component for use in an olefin polymerization reactor. In some embodiments, the methods disclosed herein avoid the formation of polymer agglomerates in the reactor and minimize potentially negative effects on catalyst yield.

The present technology relates to a method of introducing a supported antistatic compound that does not comprise a transition-metal-based catalyst component for use in an olefin polymerization reactor. In some embodiments, the methods disclosed herein avoid the formation of polymer agglomerates in the reactor and minimize potentially negative effects on catalyst yield.

Polymerization process having a plurality of processing steps in which an inert gas is used or is provided as a back-up, each of the processing steps being assigned a ranking based on the requirement for an inert gas flow in the processing step. The process, in the event of a process upset, controls with a control system the supply of available inert gas based on the rankings.

Polymerization process having a plurality of processing steps in which an inert gas is used or is provided as a back-up, each of the processing steps being assigned a ranking based on the requirement for an inert gas flow in the processing step. The process, in the event of a process upset, controls with a control system the supply of available inert gas based on the rankings.