| US 7,546,747 B2 | ||
| Process for production of a dried carboxylic acid cake suitable for use in polyester production | ||
| Kenny Randolph Parker, Afton, Tenn. (US); Robert Lin, Kingsport, Tenn. (US); and Philip Edward Gibson, Kingsport, Tenn. (US) | ||
| Assigned to Eastman Chemical Company, Kingsport, Tenn. (US) | ||
| Filed on Jan. 15, 2004, as Appl. No. 10/758,676. | ||
| Prior Publication US 2005/0159616 A1, Jul. 21, 2005 | ||
| Int. Cl. C07C 51/42 (2006.01); C07C 51/16 (2006.01) | ||
| U.S. Cl. 62—486 [562/416] | 22 Claims |
| 1. A process for producing a dried carboxylic acid cake, said process comprising:
(a) oxidizing in an oxidation zone an aromatic feedstock to produce a carboxylic acid slurry;
(b) removing in a liquor exchange zone impurities from said carboxylic acid slurry to form a water-wet carboxylic acid cake,
a mother liquor stream, a solvent mother liquor stream, and a solvent/water byproduct liquor stream; wherein at least one
solvent is, added counter current to the flow of said carboxylic acid slurry; wherein said liquor exchange zone comprises
one solid-liquid separation device capable of performing the removal of said impurities from said carboxylic acid slurry and
producing said water-wet carboxylic acid cake from said carboxylic acid slurry; wherein said solvent comprises acetic acid,
and
(c) drying said water-wet carboxylic acid cake in a drying zone to form said dried carboxylic acid cake; wherein said water-wet
cake maintains the form of a cake between step (b) and (c).
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