Appeal No. 1998-0305
Application 08/385,110
polymerized vinyl chloride resin. Claim 5 is illustrative:
5. A tower for removing residual monomers from a slurry
of vinyl chloride resin which has undergone a polymerization
reaction which comprises the following structural features:
1) the tower has at least upper and lower sections of a
generally cylindrical shape with different inner diameters,
2) the uppermost section of the tower has a port for
introducing a slurry of vinyl chloride resin into the tower,
3) the inner diameter of the uppermost section of the
tower is greater than that of the lower section of the tower,
4) at least one perforated tray is provided at the upper
section of the tower,
5) at least one perforated tray is provided at the lower
section of the tower,
6) a flow-down section for flowing down the vinyl
chloride resin slurry to the lower perforated tray is provided
between the perforated trays,
7) a means for ejecting steam in an upward direction in
the tower is provided at the bottom of the tower,
8) a port for discharging the treated vinyl chloride
resin slurry is provided at the lowermost section of the
tower, and
9) at least one hot water-ejecting device is located
proximate at least one of said perforated tray in the tower.
THE REFERENCES
Ohsol et al. (Ohsol) 2,433,060 Dec. 23,
1947
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