Polymer treatment for separating volatile material

Details Polymer treatment for separating volatile material Polymer treatment for separating volatile material

2007-06-19

2007-06-19

Boykin, Terressa (Department: 1711)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Treating polymer containing material or treating a solid...

C034S287000, C095S266000, C095S267000, C159S003000, C159S046000, C203S010000, C203S011000, C203S019000, C528S481000, C528S483000

Reexamination Certificate

active

10475344

ABSTRACT:
A process for the separation of volatile material from particulate polymer which has been substantially freed from unreacted monomer in an earlier separation step, comprising (a) feeding the particulate polymer to a purge vessel, optionally causing it to move through the vessel in substantially plug-flow mode, (b) heating the particulate polymer in the purge vessel to a temperature greater than 30° C. but insufficiently high to cause the particles to become agglomerated, and/or maintaining the polymer at a temperature in this range in the purge vessel, (c) feeding air to the purge vessel counter-current to the movement of the particulate polymer to remove volatile material therefrom, (d) removing the particulate polymer from the purge vessel. Preferably the particulate polymer fed to the purge vessel is caused to move through the vessel in substantially plug-flow mode. The process is particularly suitable for polyethylene.

REFERENCES:
patent: 3799234 (1974-03-01), Skidmore
patent: 4372758 (1983-02-01), Bobst et al.
patent: 5476622 (1995-12-01), Moorhead et al.
patent: 5955569 (1999-09-01), Dujari et al.
patent: 0 047 077 (1982-03-01), None
patent: 1 272 778 (1972-05-01), None
patent: 05239159 (1993-09-01), None
“Multi-Tray Fluidized Bed Column for Resin Degassing”, Research Disclosure, Kenneth Mason Publications, Hampshire, GB, No. 431, p. 432, (Mar. 2000).

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