Patent ID: 6830607
Filing Date: 2004-12-14
Classification: B01D,C08F

Abstract:
A slurry tray for removing residual vinyl chloride monomer from a polyvinylchloride resin slurry with reduced discoloration of the polyvinylchloride resin in a plate tower, the slurry tray comprising:at least one channel formed upon the slurry tray that allows the polyvinylchloride resin slurry to flow along a top surface of the slurry tray; at least one baffle disposed upon the slurry tray that separates each channel and guides the polyvinylchloride resin slurry to flow in the channel at a velocity greater than about one foot per second to maintain solids contained within the polyvinylchloride resin slurry in liquid suspension; at least one downcomer to direct the polyvinylchloride resin slurry to the next slurry tray and to prevent flooding on each slurry tray, the at least one downcomer being void of any dead spaces thereby ensuring plug flow through the at least one downcomer; at least one weir including at least one hole to allow solids trapped at the bottom of the weir to flow continuously downward to a bottom of the plate tower and to allow a portion of a minimum flow required to prevent flooding on the slurry tray to flow into the downcomer and down to the next slurry tray, the downcomer providing a minimum space between the at least one weir and a wall of the plate tower so that a large enough volume and weir length exists to provide a sufficient volume of polyvinylchloride resin slurry to pass through the downcomer to maintain solids contained within the polyvinylchloride resin slurry in liquid suspension; and a plurality of openings disposed upon the slurry tray to allow the polyvinylchloride resin slurry to flow down the plate tower and to allow a second warmer material to rise upward through the plate tower countercurrently contacting the polyvinylchloride resin slurry flowing down the plate tower.