Abstract:
A process/apparatus is disclosed for continuously separating a liquid medium comprising diluent and unreacted monomers from a polymerization effluent comprising diluent, unreacted monomers and polymer solids, comprising a continuous discharge of the polymerization effluent from a slurry reactor through a discharge valve and transfer conduit into a first intermediate pressure flash tank with a conical bottom defined by substantially straight sides inclined at an angle to that of horizontal equal to or greater than the angle of slide of the slurry/polymer solids and an exit seal chamber of such diameter (d) and length (1) as to maintain a desired volume of concentrated polymer solids/slurry in the exit seal chamber such as to form a pressure seal while continuously discharging a plug flow of concentrated polymer solids/slurry bottom product of the first flash tank from the exit seal chamber through a seal chamber exit reducer with inclined sides defined by substantially straight sides inclined at an angle to that of horizontal equal to or greater than the angle of slide of the polymer solids which remain after removal of about 50 to 100 % of the inert diluent therefrom to a second flash tank at a lower pressure.
Abstract:
This invention is related to a polyethylene resin particularly suitable for large parts by blow molding and/or sheet extrusion/thermoforming procedures, wherein the resin is made by a process using an activated chromium and titanium-based catalyst.
Abstract:
A process for converting a loop reactor having at least 8 vertical legs into multiple loop reactors. The multiple loop reactors are used in a continuous slurry polymerization process.
Abstract:
A process/apparatus is disclosed for continuously separating a liquid medium comprising diluent and unreacted monomers from a polymerization effluent comprising diluent, unreacted monomers and polymer solids, comprising a continuous discharge of the polymerization effluent from a slurry reactor through a discharge valve and transfer conduit into a first intermediate pressure flash tank with a conical bottom defined by substantially straight sides inclined at an angle to that of horizontal equal to or greater than the angle of slide of the slurry/polymer solids and an exit seal chamber of such diameter (d) and length (1) as to maintain a desired volume of concentrated polymer solids/slurry in the exit seal chamber such as to form a pressure seal while continuously discharging a plug flow of concentrated polymer solids/slurry bottom product of the first flash tank from the exit seal chamber through a seal chamber exit reducer with inclined sides defined by substantially straight sides inclined at angle to that of horizontal equal to or greater than the angle of slide of the polymer solids which remain after removal of about 50 to 100 % of the inert diluent therefrom to a second flash tank at a lower pressure.
Abstract:
The present invention relates to the removal of hydrocarbon residues from a catalyst and more specifically the air activation of a catalyst containing hydrocarbon residues and also related to extruded pipe resins comprising polyethylene and to a polyethylene resin particularly suitable for large parts by blow molding and/or sheet extrusion/thermoforming procedures, wherein the resin is made by a process using an activated chromium and titanium-based catalyst.
Abstract:
The present invention relates to the removal of hydrocarbon residues from a catalyst and more specifically the air activation of a catalyst containing hydrocarbon residues and also related to extruded pipe resins comprising polyethylene and to a polyethylene resin particularly suitable for large parts by blow molding and/or sheet extrusion/thermoforming procedures, wherein the resin is made by a process using an activated chromium and titanium-based catalyst.
Abstract:
This invention is related to conduit resins comprising resins comprising ethylene made using an activated chromium and titanium-based catalyst.
Abstract:
The present invention relates to the removal of hydrocarbon residues from a catalyst and more specifically the air activation of a catalyst containing hydrocarbon residues.
Abstract:
A slurry loop reactor for polymerization comprising a discharge conduit (8C) extending a distance into the loop reactor, the conduit (8C) having a longitudinal axis and an opening (325) inside the loop reactor. At least a portion of the conduit is curved along its longitudinal axis inside the reactor. The opening (325) substantially faces the flow of the slurry (318). Preferably, the discharge conduit is located within a curved portion of the loop reactor.