Method for manufacturing purified bis(beta-hydroxyethyl)terephthalate
Bis - (beta - hydroxyethyl) terephthalate obtained by reacting terephthalonitrile, ethylene glycol and water is purified by contacting e.g. mixing it with or suspending it in chloroform or passing chloroform through layers of the terephthalate. The terephthalate is separated, for example by pressuri...
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Zusammenfassung: | Bis - (beta - hydroxyethyl) terephthalate obtained by reacting terephthalonitrile, ethylene glycol and water is purified by contacting e.g. mixing it with or suspending it in chloroform or passing chloroform through layers of the terephthalate. The terephthalate is separated, for example by pressurized filtration, suction filtration or centrifugal separation and polymerized by heating it to a temperature higher than the melting point of polyethylene terephthalate produced under substantial vacuum, but not in excess of 300 DEG C., in the presence of known polymerization catalysts such as cadmium, zinc, manganese, cobalt, antimony or lead to produce a practically colourless polymer. Examples are given. |
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