Process of centrifugally removing inorganic compounds from polye

Details Process of centrifugally removing inorganic compounds from polye Process of centrifugally removing inorganic compounds from polye

1990-06-11

1992-10-27

Bascomb, Jr., Wilbur

Distillation: processes, separatory

With chemical reaction

Including step of adding catalyst or reacting material

203 35, 203 37, 203 38, 203 47, 203 72, 203 73, 423 76, 423 84, 568868, 568871, B01D 310, B01D 4512, C07C 2980

Patent

active

051586517

ABSTRACT:
A process for removing inorganic compounds from glycol recovery still bottoms resulting from the manufacture of poly(ethylene terephthalate), the novel process using a small amount of phosphoric acid to precipitate the antimony and then removing the titanium dioxide and antimony compound by a centrifuge. The novel process for removing the inorganic compounds from the recovery polyester bottoms includes the steps of distilling ethylene glycol from the spent glycol until the remaining bottoms have a solids concentration from about 15% to about 45%; adding phosphoric acid to the bottoms to form an antimony compound and removing the antimony and titanium precipitates from the bottoms by a centrifuge.

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