Method of reducing compressor gas leakage

C - Chemistry – Metallurgy – 08 – F

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C08F 2/00 (2006.01) C08F 10/00 (2006.01) C10M 169/04 (2006.01) F04B 39/02 (2006.01)

Patent

CA 1205947

METHOD OF REDUCING COMPRESSOR GAS LEAKAGE ABSTRACT Gas leakage from a high pressure compressor used in providing olefin monomer feed to a high pressure polymeriza- tion reactor is minimized by the addition of an antioxidant to the cylinder lubrication fluid to provide an antioxidant concentration of from about 3 wt % to about 10 wt %. BACKGROUND OF THE INVENTION The present invention relates to a method of reducing cyl- inder gas leakage from compressors used in high pressure ole- fin polymerization processes and to increase the time intervals between replacements of worn cylinder assemblies. In commercial high pressure polymerization processes, e.g. for the production of low density polyethylene, ethylene-viny acetate copolymers, etc., the monomer feed is conventionally brought to the desired reactor inlet pressure by means of mul- ti stage reciprocating compressors. Because of the high pres- sures involved, i.e., at least about 1000 atmospheres and typ- cally from about 1500 to about 3000 atmospheres, accurate fit- ting of the packing around the periphery of the plunger rod is essential to provide adequate sealing and minimize gas leakage from the compressor cylinder along the plunger to the atmosphere. It is also necessary to provide correct lubrication to minimize frictional wear, and to this end a lubricating li- quid is normally fed to the periphery of the plunger at one or

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