PURIFICATION OF RECYCLED 1,3-PROPANEDIOL DURING POLYESTER PREPARATION

A process for preparing a 1,3-propanediol-based polyester in which a carbony l- containing 1,3-propanediol stream is purified for reuse of the 1,3- propanediol. The process involves reacting, under condensation polymerizatio n conditions, terephthalic acid and a molar excess of 1,3-propanediol, with...

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Bibliographische Detailangaben
Hauptverfasser:	KELSEY, DONALD ROSS, SCARDINO, BETTY MARROU, ZRONEK, STEVEN CHARLES
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	ACYCLIC OR CARBOCYCLIC COMPOUNDS CHEMISTRY COMPOSITIONS BASED THEREON MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY ORGANIC CHEMISTRY ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-UP
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Beschreibung
Zusammenfassung:	A process for preparing a 1,3-propanediol-based polyester in which a carbony l- containing 1,3-propanediol stream is purified for reuse of the 1,3- propanediol. The process involves reacting, under condensation polymerizatio n conditions, terephthalic acid and a molar excess of 1,3-propanediol, with distillation and condensation of a major portion of the unreacted 1,3- propanediol. To this condensed stream is added a sufficient amount of base t o raise the pH to a value greater than 7, and from this base-containing condensate the 1,3-propanediol is distilled and recycled to the polymerizati on reaction.