Continuous process for the manufacture of bis(2-hydroxyethyl) terephthalate and lowmolecular weight polymers thereof

摘要

A continuous process for producing a bis(hydroxyalkyl)terephthalate by the catalytic reaction of a terephthalate of a C1- 8 alkanol with a C2- 10 polymethylene glycol is characterized by a static hold-up of at least 25% of the reactants in the reaction zone; the product may be converted to a polymethylene terephthalate of 8-16 degrees of polymerization by passing it through a heated zone in the form of a thin film.