Process for centrifugally removing inorganic compounds from...

Details Process for centrifugally removing inorganic compounds from... Process for centrifugally removing inorganic compounds from...

C - Chemistry, Metallurgy

07

C

C07C 29/80 (2006.01) B04B 1/00 (2006.01) C02F 1/52 (2006.01) C07C 29/76 (2006.01) C07C 31/20 (2006.01)

Patent

CA 2044019

PROCESS OF CENTRIFUGALLY REMOVING INORGANIC COMPOUNDS FROM POLYESTER GLYCOL RECOVERY BOTTOMS ABSTRACT OF THE INVENTION 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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