Method of polyester manufacturing using crossflow membrane filtr

Details Method of polyester manufacturing using crossflow membrane filtr Method of polyester manufacturing using crossflow membrane filtr

1997-10-01

1999-08-03

Fortuna, Ana

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

210650, 210660, 210663, 210681, B01D 6100

Patent

active

059321059

ABSTRACT:
An improved process for the manufacture of polyester resin from the esterification of an aromatic acid with a glycol followed by polycondensation in the presence of a metal oxide catalyst in which spent glycol is removed during the course of the polycondensation reaction along with insolubles, large particulates, low molecular weight oligomers, metal oxide catalyst, cation impurities and anion impurities, and trace amounts of other impurities in which the temperature of the spent glycol is increased to maintain the monomer dissolved in solution while passing the spent glycol to a crossflow membrane filtration device with sufficient fluid velocity across the crossflow membrane filtration device to maintain turbulent flow. The glycol permeate is recycled to the esterification process while the concentrated insolubles are separated from the purged retentate.

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Encyclopedia of Separation Technology, vol. 2., pp. 1230-1233, 1241-1249 ,D. Ruthven, ed. (John Wiley & Sons, 1997).

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