... existing in PTA solution to water-soluble substance PDC-01 palladium-carbon catalyst is mainly use for hydrogeantion of ... 1000appearanceBlack granuleiron300ppm maxcopper50ppm maxsurfur500ppm maxReference operating conditionsTemperature,260-300Pressure,5.0-8.0Mpa,partial pressure of hydrogen,0.4 ... -0.8MpaSpace velocity, 5-15 hr-1Material,PTA concentration,28%;4-CBA content ...