Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Treating polymer containing material or treating a solid...
Patent
1977-03-30
1981-08-04
Henderson, C. A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Treating polymer containing material or treating a solid...
159 4CC, 159 16S, 528502, C08F 624, C08F 1406
Patent
active
042823480
ABSTRACT:
Unreacted residual monomer is removed from an aqueous slurry of a vinyl chloride polymerizate by a method, according to which the monomer-containing aqueous slurry continuously fed to a plate column from its top runs down by way of a cyclone-type mist separator and through a plurality of perforated plates, coming into counter-current contact with steam which is blown into the column from its bottom and ascends through the same perforated plates, to dissipate the monomer in the form of vapors, and the steam carrying the dissipated monomer vapors having entered the mist separator is subjected to mist separation and heat exchange with the slurry fed, and the resulting steam is discharged out of the column, followed by condensation to recover the monomer. The slurry having reached the bottom of the column is transferred to a flush tank where it is quenched to generate steam which is then blown into the column for recycling.
REFERENCES:
patent: 3622553 (1971-11-01), Cines
patent: 3926927 (1975-12-01), Stookey
patent: 3954910 (1976-05-01), Kropp
patent: 3956249 (1976-05-01), Goodman
Okuno Yoshitaka
Wada Norinobu
Henderson C. A.
Shin-Etsu Chemical Co. , Ltd.
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