CONTINUOUS PROCESS FOR THE PURIFICATION OF POLYCARBONATE SOLUTIONS

Continuous process for the purification of polycarbonate solutions in organic solvents from process impurities, said process consisting of a series of aqueous washing stages where in each stage the washing was accomplished by emulsifying the organic solution with an aqueous phase of suitable pH comp...

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Bibliographische Detailangaben
Hauptverfasser:	RINALDI, ROBERTO, GOVONI, GABRIELE, VISANI, FRANCESCO
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY COMPOSITIONS BASED THEREON MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-UP
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Beschreibung
Zusammenfassung:	Continuous process for the purification of polycarbonate solutions in organic solvents from process impurities, said process consisting of a series of aqueous washing stages where in each stage the washing was accomplished by emulsifying the organic solution with an aqueous phase of suitable pH comprised between 2 and 14, and by the successive separation of the two phases, characterized in that said separation is carried out by sending the emulsion with a spacial velocity of 0.01 to 2 cm/sec. through a layer of fibres 10-500 mm thick and having an apparent density of 0.2 - 0.7 g/cc, and by then continuously removing the phases that separate in the form of two layers, beyond the layer of fibres.