Abstract: Disclosed are a process and autoclave reactor configured to create, in a polymerization zone of the autoclave reactor, a first mixing current, a second mixing current, and an interface located between the first mixing current and the second mixing current, wherein the interface is offset from a reaction component inlet of the autoclave reactor that introduces a reaction component stream into the polymerization zone.

Abstract: Polymer additive(s) are injected into molten polymer upstream of the hopper that feeds a molten mix of polymer with incorporated polymer additive(s) to a polymer extruder. Additive incorporation into the molten polymer is facilitated by an inlet device positioned inside the hopper, where the inlet device is configured to: i) receive a feed stream comprising a molten polymer, a liquid diluent, a polymer additive, and unreacted monomer, ii) provide one or more solid surfaces for incorporating the polymer additive into the molten polymer, and iii) direct the molten polymer and the polymer additive into the molten polymer pool that is in the hopper.

Abstract: Metal-containing ionic liquids can demonstrate a sharply increased viscosity relative to the same ionic liquids without the metal cation. Metal-containing ionic liquid compositions are disclosed that contain viscosity modifiers that reduce viscosity. Metal-containing ionic liquids are applicable to methods and within systems designed for the purpose of removing and recovering certain components of process streams such as ethylene, isobutane, or both. Methods for removing and recovering ethylene from process streams are also disclosed herein as having increased ethylene removal capacity concurrently with reductions in viscosity without corresponding reductions in metal cation concentrations.

Abstract: Methods for operating a high pressure olefin polymerization reactor include the steps of introducing an initiator stream containing ethylene and an initiator compound through an initiator nozzle into the reactor, introducing an olefin stream containing ethylene and an optional comonomer through an olefin nozzle into the reactor, and polymerizing ethylene and optionally the comonomer in the presence of the initiator stream in the reactor under high pressure polymerization conditions to produce an ethylene polymer. The amount of ethylene in the initiator stream is from 0.01 to 2 wt. % of the amount of ethylene in the olefin stream. An injection nozzle that can be used in conjunction with the high pressure reactor also is described.

Abstract: Methods for operating a high pressure olefin polymerization reactor include the steps of introducing an initiator stream containing ethylene and an initiator compound through an initiator nozzle into the reactor, introducing an olefin stream containing ethylene and an optional comonomer through an olefin nozzle into the reactor, and polymerizing ethylene and optionally the comonomer in the presence of the initiator stream in the reactor under high pressure polymerization conditions to produce an ethylene polymer. The amount of ethylene in the initiator stream is from 0.01 to 2 wt. % of the amount of ethylene in the olefin stream. An injection nozzle that can be used in conjunction with the high pressure reactor also is described.