Improved process for preparing poly(ethylene terephthalate)

Details Improved process for preparing poly(ethylene terephthalate) Improved process for preparing poly(ethylene terephthalate)

1977-04-14

1978-08-29

Phynes, Lucille M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Removing and recycling removed material from an ongoing...

560 90, 528308, C08G 6318

Patent

active

041103165

ABSTRACT:
A continuous process is disclosed for direct esterification of terephthalic acid with ethylene glycol, followed by low-pressure polymerization in a continuous polymerizer and in a finisher polymerizer to produce polyester suitable for melt-spinning into yarn for textile uses. Vapors from the polymerizers are condensed in spray condensers to recover glycol liquid, which is recycled to the direct esterification reaction. Efficient operation of the spray condensers at absolute pressures of less than 60 millimeters of mercury is achieved by addition of substantially dry ethylene glycol to lower the water content of condensate used in the sprays.

REFERENCES:
patent: 2973341 (1961-02-01), Hippe et al.
patent: 3506622 (1970-04-01), Higgins
patent: 4011202 (1977-03-01), Ebner et al.

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