PROCESS FOR CONTINUOUS POLYCONDENSATION OF TEREPHTHALIC ACID AND 1,4-BIS(HYDROXYMETHYL)CYCLOHEXANE

PROCESS FOR CONTINUOUS POLYCONDENSATION OF TEREPHTHALIC ACID AND 1,4-BIS(HYDROXYMETHYL)CYCLOHEXANE

Process for continuous production of polyesters by esterification of terephthalic acid with 1,4-bis(hydroxymethyl)cyclohexane with a split feed in the presence of a titanium catalyst at 265 DEG to 305 DEG C. and 0.8 to 1.5 bar up to a conversion of 98.0% to 99.0%, then performing precondensation at...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: KYBER, MANFRED, SCHMIDT, WOLFGANG, THIELE, ULRICH
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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Zusammenfassung:Process for continuous production of polyesters by esterification of terephthalic acid with 1,4-bis(hydroxymethyl)cyclohexane with a split feed in the presence of a titanium catalyst at 265 DEG to 305 DEG C. and 0.8 to 1.5 bar up to a conversion of 98.0% to 99.0%, then performing precondensation at 290 DEG to 305 DEG C. and 0.01 to 1.5 bar up to a conversion of 99.4% to 99.7% and finally performing polycondensation at 295 DEG to 310 DEG C. and less than 1.5 mbar up to a conversion corresponding to 50% to 95% of the maximum possible viscosity after adding more titanium catalyst.