Process for the multistage generation of vacuum for polyester pr

Details Process for the multistage generation of vacuum for polyester pr Process for the multistage generation of vacuum for polyester pr

1995-02-09

1995-11-14

Foelak, Morton

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

Synthetic resins

Removing and recycling removed material from an ongoing...

526 67, 5283083, 5283084, 5283087, C08F 200, C08G 8500, C08G 6300

Patent

active

054667763

ABSTRACT:
Process for multi-stage generation of a vacuum and condensation and recycling of the vapors of polycondensation in the production of polyester, where the last stage includes a liquid ring pump compressing to atmospheric pressure, a cooler and a degasifier tank. The process also includes at least two preceding stages each using a glycol vapor jet that is operated with superheated glycol vapor at a pressure in the range of 0.8 to 1.0 bar abs. and a downstream glycol spray condenser whose operating conditions are regulated to condense a maximum quantity of glycol and at the same time causing the low-boiling reaction by-products including water to remain in the gas phase.

REFERENCES:
patent: 3468849 (1969-09-01), Rothert
patent: 4011202 (1977-03-01), Ebner et al.

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