Method and apparatus for polymerizing ethylene at ultra-high pressure

Abstract

The present invention relates to a method and a plant for the preparation of ethylene polymers by free-radical polymerization at ultra-high pressure. The polymerization is carried out in an autoclave reactor in the presence of a free radical initiator. The autoclave reactor is characterized by having one or more elongated partitions (5) secured to the inner reactor wall (12).

Description

technical field [0001] The present invention relates to a method and a plant for the preparation of ethylene polymers by free-radical polymerization at ultra-high pressure. Background technique [0002] LDPE with polar co-monomer (co-monomer) of ethylene and co-monomer can pass through free base polymerization to produce. These reactions are often carried out in thick-walled autoclave reactors specially designed to withstand extreme operating conditions. [0003] In order to control temperature and polymer concentration, vigorous agitation was required to establish uniformity throughout the reactor. If areas within the reactor are not sufficiently agitated, polymerization in such localized areas can rise above that in the rest of the vessel, and the temperature can rise in those areas to form hot spots and cause runaway decomposition. [0004] To improve mixing, radial impeller agitators have been developed. These mixers performed better than previous generation mixers, ...

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Problems solved by technology

Therefore threading the wall bulkhead to the inner surface of the column by studs or bolts is not considered a viable option as even rolled threads (as opposed to cut threads) pose too much risk of cracking and check difficulty

Similarly, welding a wall bulkhead to the inner surface of a column will reduce the integrity of the quenched and forged metal, making it weaker or harder and more prone to cracking

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