Process and apparatus for filtering polymers

Details Process and apparatus for filtering polymers Process and apparatus for filtering polymers

1985-08-05

1987-03-31

Castel, Benoit

Liquid purification or separation

Processes

Separating

210780, 210184, 210401, 210447, B01D 2902, B01D 3518, B01D 3332

Patent

active

046541519

ABSTRACT:
A process and apparatus for filtering a polymer which passes through a heated, high pressure filtering chamber across which a filter members passes and in which sealing plugs made of the substance being filtered are formed within entry and exit zones thereof. A plug removal zone is provided between the entry port for said filter and the outflow aperture of the filtering chamber. The zone is provided with a valve to permit removal of sealing plug material when in a heat-softened state. A cooled, substantially rigid plug of polymer is formed initially. Thereafter, the plug is heated at one end to soften it and to permit displacement of a part of it through the valve by fresh, hot polymer. In alternative embodiments, the plug removal zone is not needed and the plug is permitted to pass into the passage but is then diverted before meeting the main flow of substance being filtered. In some cases, bleeding is not carried out but the plug is heated in the inlet port to melt it and provide melt homogeneity when the substance joins the substance being filtered.

REFERENCES:
patent: 3645399 (1972-02-01), Kalman
patent: 3856674 (1974-12-01), Kalman
patent: 3856680 (1974-12-01), Elmore
patent: 3940335 (1976-02-01), Kalman
patent: 3971721 (1976-07-01), Fogarty, Jr.
patent: 4010391 (1977-03-01), Kalman
patent: 4021346 (1977-05-01), Berthiaume

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