Process for treating a polyolefin discharged from an olefin...

Details Process for treating a polyolefin discharged from an olefin... Process for treating a polyolefin discharged from an olefin...

2007-07-10

2007-07-10

Teskin, Fred (Department: 1713)

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

Synthetic resins

Treating polymer containing material or treating a solid...

C526S067000, C526S068000

Reexamination Certificate

active

10882231

ABSTRACT:
Process for treating polyolefin discharged from an olefin polymerization reactor which comprises steps of discharging from a polymerisation reactor a slurry comprising polyolefin and diluent; submitting said slurry to a pressure release such that the diluent is evaporated and a polyolefin/gas mixture is formed; discharging said polyolefin/gas mixture into a collecting vessel; controlling a level of settled polyolefin in the collecting vessel; discontinuously transferring the polyolefin/gas mixture in the collecting vessel into a concentrating vessel; and discharging said concentrator vessel in such a way that said polyolefin/gas mixture is transferred into the hydrocarbon purge bin.Embodiments also comprise the use of two interconnected concentrator vessels and the optimized recovery of the diluent from the purge bin.

REFERENCES:
patent: 4501885 (1985-02-01), Sherk et al.
patent: 5769927 (1998-06-01), Gottschlich et al.
patent: 6271319 (2001-08-01), Baker et al.
patent: 6858682 (2005-02-01), Kendrick et al.

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