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A process and apparatus for passing a polymerization effluent, comprising solid polymer, unreacted monomer, diluent and minor amounts of contaminants, to a high pressure flash where most of the fluid components are flashed and wherein a slip stream comprising diluent and minor amounts of monomer is

A process and apparatus for passing a polymerization effluent, comprising solid polymer, unreacted monomer, diluent and minor amounts of contaminants, to a high pressure flash where most of the fluid components are flashed and wherein a slip stream comprising diluent and minor amounts of monomer is separated from the bulk of the flashed fluid components. The slip stream is subjected to olefin removal to give an essentially olefin-free stream for recycle to a catalyst mud preparation area. The bulk of the flashed fluid components are recycled directly back to the polymerization zone without expensive olefin removal, although treatment to remove other contaminants can optionally be performed. The polymer and entrained fluid is passed to a low pressure flash zone where the fluids are flashed off, compressed and joined with the flash from the high pressure flash tank. Because the bulk of the fluids are removed in the high pressure flash, compression and cooling of product fluids prior to recycle is kept to a minimum.

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[ That which is claimed is:] [1.]1. A process comprising:introducing an effluent from a polymerization zone, said effluent comprising solid polymer and a fluid comprising diluent, into a flash zone under conditions of temperature and pressure such that a major portion of said fluid flashes overhead

[ That which is claimed is:] [1.]1. A process comprising:introducing an effluent from a polymerization zone, said effluent comprising solid polymer and a fluid comprising diluent, into a flash zone under conditions of temperature and pressure such that a major portion of said fluid flashes overhead to form a flash gas stream;separately withdrawing said solid polymer and remaining fluid as an intermediate product of said process;dividing said flash gas stream into two streams, a main diluent recycle stream which constitutes a major portion of said flash gas stream, and a diluent recycle slip stream which constitutes a minor portion of said flash gas stream;recycling said main diluent recycle stream to said polymerization zone;passing said diluent recycle slip stream through an olefin removal zone to produce a purified recycle diluent slip stream; andpassing said purified recycle diluent slip stream to a catalyst mixing zone.