C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 63/26 (2006.01) C07C 51/43 (2006.01) C07F 9/46 (2006.01)
Patent
CA 2108268
A process is disclosed for preparation of purified terephthalic acid containing 200 ppmw or less of p-toluic acid. A filter cake of purified terephthalic acid is prepared by filtering, under a differential pressure of about or greater than 0.5 psi over the system pressure and a temperature within the range of from about 100 °C to about 205 °C, an aqueous slurry of purified tereph- thalic acid containing a solution of p-toluic acid. The aqueous solution of p- toluic acid remaining in the filter cake of purified ter- ephthalic acid is displaced from the filter cake by water under a pressure gradient over the system pressure at a temperature with- in the range of from about 100 °C to about 205 °C. Pressure flash evaporation of water remaining in the filter cake occurs upon release of the system pressure to lower pressure with consequent lower temperature. The crystalline terephthalic acid product con- taining 200 ppmw or less p-toluic acid can be dried under atmospheric pressure. Purified terephthalic acid is useful for the manu- facture of polyesters from which clothing and related goods are made.
Graziano Diane J.
Grimm Roger J.
Schiller Sandra K.
Streich Debra J.
Amoco Corporation
Bp Corporation North America Inc.
Gowling Lafleur Henderson Llp
LandOfFree
Improved process for recovery of purified terephthalic acid does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Improved process for recovery of purified terephthalic acid, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Improved process for recovery of purified terephthalic acid will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1561615