Removing volatile compounds from polymer pellets
AssigneeBorealis Technology Oy
InventorsAmir Karbasi, Esa Korhonen, Ensio Hietanen, Karin H. Knudsen, Kai Hagane, Fred Bergmann, Klaus Nyfors
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Abstract
The invention is directed to a process for the treatment of plastic material comprising a) providing a liquid; b) contacting the plastic material with the liquid; c) keeping the plastic material in the liquid at Tb−25° C. to Tb of the liquid, wherein Tb is the boiling point of the liquid at the applied pressure; and d) removing the plastic material from the liquid. Furthermore, the invention is directed to the use of a liquid for the treatment of plastic material and to a plant for treating plastic material with a liquid.
Claims22
A process for the treatment of plastic material comprising
- a) providing a liquid;
- b) contacting the plastic material with the liquid;
- c) keeping the plastic material in the liquid at Tb−25° C. to Tb of the liquid, wherein Tb is the boiling point of the liquid at the applied pressure;
- and
- d) removing the plastic material from the liquid:
- wherein the liquid is selected from water, ethanol, propanol, isopropanol, butanol and mixtures thereof
- and wherein
- the plastic material is a polyolefin.
(canceled)
(canceled)
A plant for removing volatile components from plastic material comprising:
- (a) an extruder (101) for extruding olefin polymers;
- (b) a pelletiser (102) adjacent to extruder (101);
- (c) a treatment tank (103) or a group of treatment tanks for degassing of the polymer;
- (e) a liquid tank (105) or a group of liquid tanks;
- (f) a conduit (106) or a group of conduits for transporting the pellet slurry, obtained from pelletiser (102) to treatment tank (103) or to the group of treatment tanks;
- (g) a conduit (107) or a group of conduits for connecting the liquid tank (105) or the group of liquid tanks with pelletiser (102)
- (h) pumping means (108) for establishing a liquid flow along conduit (107) or the group of conduits mentioned under (g) above;
- (i) a conduit (109) or a group of conduits for connecting the liquid tank (105) or the group of liquid tanks with the treatment tank (103) or the group of treatment tanks;
- (k) pumping means (110) for establishing a liquid flow along the conduit (109) or the group of conduits mentioned under (i) above;
- (l) a conduit (111) or a group of conduits for the withdrawal of the pellet slurry from the treatment tank (103) or from each of the group of treatment tanks;
- and
- (m) a conduit (112) or a group of conduits for feeding liquid from a liquid source into the liquid tank (105) or the group of liquid tanks.
A plant for removing volatile components from plastic material comprising:
- (a) an extruder (1) for extruding olefin polymers;
- (b) a pelletiser (2) adjacent to extruder (1);
- (c) a liquid separator (4);
- (d) a conduit (3) for transporting the pellets from the pelletiser (2) to liquid separator (4);
- (e) a treatment tank (6) connected to liquid separator (4) through conduit (5);
- (g) a liquid tank (18) connected to the pelletiser (2) via conduit (19) and to liquid separator (4) via conduit (17);
- (h) pumping means (20);
- (k) a conduit (8) for the removal of the pellet slurry from treatment tank (6);
- (l) a liquid separator (9) connected via conduit (8) to treatment tank (6);
- (m) a liquid tank (31) receiving the separated liquid from liquid separator (9) through conduit (28);
- (n) a conduit (33) connecting liquid tank (31) with treatment tank (6);
- and
- (o) pumping means (34).
Dependencies are inferred from the claim text.