Abstract: An apparatus and method for continuously removing polymer from a pressurized loop olefin polymerization reactor containing a slurry of polymer particles and fluids. The slurry is continuously discharged from polymer-rich zones of the reactor and enters one or a series of non-cyclonic flash vessels, in which the particles separate from the fluid. The flash vessel has a conical bottom in which a minimum level of polymer is maintained for a dynamic seal between the inlet and outlet.

Abstract: A method for curing particulate arylene sulfide polymer in which the particulate polymer is preheated from ambient temperature to a skin temperature within the range of about 230.degree. to about 260.degree. C. by agitating the particulate polymer in a polisher apparatus, transferring the preheated particles to a curing vessel, and further heating the preheated particulate polymer in the curing vessel for a time and at a temperature to produce cured polymer having a pre-selected melt flow range. Preferably, preheating is carried out continuously with the heated polymer delivered to alternative curing vessels wherein the curing is carried out batch wise.

Abstract: Uniformity of flow rate through an extrusion or pelleting die is provided through each of a plurality of orifices of substantially equal cross sectional area by providing a die in which the length of a narrowed portion of a downstream passageway associated with each orifice is chosen to provide the desired flow characteristics.

Abstract: By cooling the barrel of a devolatilizing extruder rather than by heating it, both the solvent removal rate and the polymer feed rate could be increased furthermore, the power surging of the motor driving the extruder was largely reduced or even eliminated by the process of this invention.

Abstract: By cooling the barrel of a devolatilizing extruder rather than by heating it, both the solvent removal rate and the polymer feed rate could be increased; furthermore, the power surging of the motor driving the extruder was largely reduced or even eliminated by the process of this invention.