Liquid purification or separation – Processes – Separating
Patent
1999-03-25
2000-09-12
Popovics, Robert J.
Liquid purification or separation
Processes
Separating
210774, 2103232, 210340, 210420, 210424, 425199, B01D 3700, B01D 3502, B01D 3530
Patent
active
06117338&
ABSTRACT:
Apparatus for continuously filtering molten polymer comprising: an arbor seated in a fixed support, the arbor having inlet and outlet ports for respectively receiving contaminated and discharging filtered melt, the ports communicating with openings in a pair of housings rotatably mounted on the arbor; a plurality of filter pod assemblies outwardly of and mounted on the rotatable housings, each assembly having a filter for contaminated melt and intake and discharge openings intermittently alignable with the ports on rotation of the housings to position a clean filter in the path of the contaminated melt and to remove the filter from the path when blocked with contaminants; passages associated with the inlet and outlet ports of the arbor and the housings for gradually establishing a flow of melt into a clean filter as it is rotated into filtering position; and thermally dilatable seal between the rotatable housings and the arbor to seal the housings and the arbor during the filtering of contaminated melt by a filter element of a filter pod assembly and to establish a clearance between the housings and arbor as a result of thermal expansion of the thermally dilatable seal to allow rotary movement of each housing to replace a blocked filter with a clean filter. A continuous filter process is provided by operation of the above apparatus.
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Bourcier David P.
Hoagland John C.
Popovics Robert J.
Solutia Inc.
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