Abstract: A slurry tray and a method for removing residual vinyl chloride monomer from a polyvinylchloride resin slurry with reduced discoloration of the polyvinylchloride resin is provided. The slurry tray preferably includes partitioned channels that cause the slurry to flow at a velocity that maintains solids contained with the slurry in a liquid suspension and weirs contains holes to allow solids trapped at the bottom of the weir to flow continuously downward to a bottom of the plate tower for removal from the tower. The method preferably includes supplying the slurry towards the top of the tower and a vapor towards the bottom of the tower. The slurry descends the tower, while the steam simultaneously ascends the tower, both through directional valves. The solids trapped upon the surface of the trays travel down the tower through the holes within the weirs for removal from the tower.

Abstract: A hydrocarbon cracking process and apparatus for recovering ethylene from hydrocarbon raw material streams. More particularly, the hydrocarbon cracking process and apparatus of this invention utilizes a furnace with a convection section and a radiant section in which the hydrocarbon feedstream is cracked by heating it to a particular temperature and then is self-quenched.

Abstract: A refrigeration method using a non-aqueous, non-hydrocarbon refrigerant to contact a hydrocarbon composition comprising a hydrocarbon vapor phase and a hydrocarbon liquid phase in order to lower the temperature of the hydrocarbon composition by lowering the partial pressure of the hydrocarbon vapor phase.