. . . "eratures in the range of about 260 to 320??? C. Solution temperatures in the range of about 260 to 320??? C. using a solvent such as water require that the solution be maintained at an elevated pressure, e.g., a pressure in the range of about 46.9 to 113 bars absolute???bara (680-1640 pounds per square inch absolute (psia). [0039] The terephthalic acid solution is fed to hydrogenation reactor 110" .