PURIFICATION OF RECYCLED 1,3-PROPANEDIOL DURING POLYESTER PREPARATION

A PROCESS FOR PREPARING A 1, 3-PROPANEDIOL-BASED POLYESTER IN WHICH A CARBONYL-CONTAINING 1, 3-PROPANEDIOL STREAM IS PURIFIED FOR REUSE OF THE 1, 3-PROPANEDIOL. THE PROCESS INVOLVES REACTING UNDER CONDENSATION POLYMERIZATION CONDITIONS, TEREPHTHALIC ACID AND A MOLAR EXCESS OF 1, 3-PROPANEDIOL, WITH...

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Hauptverfasser:	STEVEN CHARLES ZRONEK, BETTY MARROU SCARDINO, DONALD ROSS KELSEY
Format:	Patent
Sprache:	eng
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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Zusammenfassung:	A PROCESS FOR PREPARING A 1, 3-PROPANEDIOL-BASED POLYESTER IN WHICH A CARBONYL-CONTAINING 1, 3-PROPANEDIOL STREAM IS PURIFIED FOR REUSE OF THE 1, 3-PROPANEDIOL. THE PROCESS INVOLVES REACTING UNDER CONDENSATION POLYMERIZATION 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 TO 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 POLYMERIZATION REACTION.