Production of spherical (hetero)polysiloxane beads for support e.g. in catalysis

Continuous production of spherical beads of polysiloxanes and hetero-poly:siloxanes comprises injecting drops of a precursor mixture at the top of a vertical reactor into a reaction medium; maintaining a suspension of moving in the direction of gravity by controllable flow of the reaction medium; an...

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Bibliographische Detailangaben
Hauptverfasser:	WITOSSEK, HERBERT, 80939 MUENCHEN, DE, BRATZ, ERNST., 82275 EMMERING, DE
Format:	Patent
Sprache:	eng ; ger
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G CHEMISTRY COMPOSITIONS BASED THEREON GENERAL PROCESSES OF COMPOUNDING MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-UP WORKING-UP
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Beschreibung
Zusammenfassung:	Continuous production of spherical beads of polysiloxanes and hetero-poly:siloxanes comprises injecting drops of a precursor mixture at the top of a vertical reactor into a reaction medium; maintaining a suspension of moving in the direction of gravity by controllable flow of the reaction medium; and then separation as granular solid at the bottom of the reactor. Countercurrent flow of ducts and products and hence collision of drops at very different stages of polycondensation are avoided.