Apparatus for stripping residual solvent from polymer pellets

Details Apparatus for stripping residual solvent from polymer pellets Apparatus for stripping residual solvent from polymer pellets

1975-05-16

1976-05-25

Bleutge, Robert L.

Cleaning and liquid contact with solids

Apparatus

Sequential work treating receptacles or stations with means...

134 25R, 134110, B08B 304

Patent

active

039585859

ABSTRACT:
Apparatus for continuous stripping of residual volatiles from polymer pellets, having their surfaces wet with water, by the use of an upwardly moving flow of steam through a downwardly moving column of wetted polymer pellets, moving in plug-flow, which minimizes back-mixing. The apparatus operates with substantially less energy requirements than those of the prior art, and air pollution is eliminated since the apparatus recovers the volatiles by condensing the steam containing the stripped volatiles and recovering them. In the preferred case, back-mixing of the pellets at the bottom of the column is minimized by feeding the pellets to the top of the column over a deflector having a circular base approximately one-half the diameter of the column and by further deflecting the pellets at the base of the column from the center axis toward the wall of the inverted conical base of the column.

REFERENCES:
patent: 2190072 (1940-02-01), Keys
patent: 2278701 (1942-04-01), Karr
patent: 2862511 (1958-12-01), Forsberg
patent: 3081009 (1963-03-01), Cooper
patent: 3200067 (1965-08-01), Levendusky
patent: 3664354 (1972-05-01), Minbiole, Jr. et al.
patent: 3688781 (1972-09-01), Talley, Jr.

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