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A method are provided for separating diluents from solid polymers in an effluent extracted from a polymerization reactor. The separation utilizes a two-stage flash involving a first intermediate pressure flash and a second lower pressure flash, with the first intermediate pressure flash occurring in

A method are provided for separating diluents from solid polymers in an effluent extracted from a polymerization reactor. The separation utilizes a two-stage flash involving a first intermediate pressure flash and a second lower pressure flash, with the first intermediate pressure flash occurring in a cyclone vessel having an extended solids reservoir.

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A method of recovering polymer solids from a polymerization effluent extracted from a polymerization zone at a first temperature and a first pressure, said effluent comprising a slurry of said polymer solids in a liquid diluent, comprising the steps of: (a) exposing said effluent to a pressure and t

A method of recovering polymer solids from a polymerization effluent extracted from a polymerization zone at a first temperature and a first pressure, said effluent comprising a slurry of said polymer solids in a liquid diluent, comprising the steps of: (a) exposing said effluent to a pressure and temperature drop from said first pressure to a second pressure and from said first temperature to a second temperature, at least partially, in a first flash zone having the form of a cyclone with an extended solids receiving zone sufficient to allow an amount of polymer solids to collect in said extended solids receiving zone, so that a major portion of said diluent is vaporized to produce diluent vapor; (b) separating said diluent vapor from said effluent in said first flash zone by means of said pressure and temperature drop and by means of cyclonic action induced by the cyclonic shape of said first flash vessel; (c) removing said diluent vapor from said first flash zone; (d) condensing said diluent vapor without compression by heat exchange to produce condensed diluent; (e) recycling at least part of said thus produced condensed diluent to said polymerization zone; (f) passing said polymer solids into said extended solids receiving zone; (g) holding said polymer solids in said extended solids receiving zone until said extended solids receiving zone is at least partially full; and (h) thereafter passing said polymer solids from said extended solids receiving zone into a second flash zone at a third pressure lower than said second pressure wherein residual diluent remaining with said polymer solids is vaporized to residual diluent vapor.