Column system process for polyester plants

Details Column system process for polyester plants Column system process for polyester plants

1979-03-26

1981-03-03

Sever, Frank

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

Synthetic resins

Removing and recycling removed material from an ongoing...

159 31, 203 28, 203 71, 203DIG6, 528272, 528309, C07C 6982

Patent

active

042542464

ABSTRACT:
A new process for use with continuously operated plants for the production of polyester polymers suitable for producing fibers, bottles and film, by reacting ethylene glycol and terephthalic acid in the presence of a catalyst so that the vapour by-products from the esterification, prepolycondensation and polycondensation stages are continuously rectified in two in-line columns yielding ethylene glycol of high purity (99.85%) which is returned to the process, waste water with 400 ppm ethylene glycol, and a heavy fraction containing oligomers, diethylene glycol, etc.
Moreover, an improvement in the quality of the esterified product is attained as it contains less than 0.6% diethylene glycol without the use of diisopropylamine, a poisonous additive.

REFERENCES:
patent: 3367847 (1968-02-01), Pierson
patent: 4146729 (1979-03-01), Goodley et al.

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