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Patent Searching and Data


Title:
METHODS AND APPARATUS FOR REMOVING RESIDUAL MONOMERS
Document Type and Number:
WIPO Patent Application WO/1998/029460
Kind Code:
A1
Abstract:
A method and an apparatus for removing residual monomers from a slurry containing polyvinyl chloride while preventing degradation of polyvinyl chloride and the drop of its quality. The apparatus comprises a cylindrical column main body (46), a plurality of porous plates (32 to 38) disposed in a vertical direction inside the column main body, a plurality of chambers defined on the porous plates by using these porous plates as their bottom surfaces, slurry introduction portions (19 to 24) provided to at least two of these chambers, flow-down portions (13 to 18) disposed between the porous plates so as to allow the slurry to sequentially flow down from the porous plates of the upper chambers to the porous plates of the lower chambers, a steam inlet (10) disposed at the bottom of the column main body, a vent (11) disposed at the top of the column main body, a slurry discharge port (12) disposed in a chamber below a chamber having a slurry inlet, and hot water injection means (25 to 31) disposed immediately below the porous plates in such a manner as to face at least the lower surfaces of the porous plates, wherein a slurry introduction pipe (48) is connected to the slurry inlet (50) through an on/off valve (49) and the inner diameter of the slurry introduction pipe (48) is progressively expanded towards the slurry inlet (50) up to at least 1.2 times.

Inventors:
MATSUDA ETSURO (JP)
ITO YUICHI (JP)
KURAZONO TOSHINOBU (JP)
Application Number:
PCT/JP1997/004789
Publication Date:
July 09, 1998
Filing Date:
December 24, 1997
Export Citation:
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Assignee:
CHISSO CORP (JP)
MATSUDA ETSURO (JP)
ITO YUICHI (JP)
KURAZONO TOSHINOBU (JP)
International Classes:
C08F6/00; C08F6/10; C08F14/06; (IPC1-7): C08F6/24
Foreign References:
JPH06107723A1994-04-19
Other References:
See also references of EP 0949276A4
Attorney, Agent or Firm:
Kawakita, Takenaga (3-6 Nihonbashi-kayabacho 2-chom, Chuo-ku Tokyo 103, JP)
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