Process for the recovery of purified terephthalic acid (PTA)

摘要: A process for the preparation of purified terephthalic acid which comprises first introducing a liquid slurry containing crystalized with impurities into high pressure rotary filter, then filtering filter and collecting at least some solid portion. The typically consists case, pressurized pressure, drum covered by device such as, example, cloth or equivalent device, suitably lower than case. is ideally divided three zones: zone, where mother liquor removed; second washed; third excess washing removed discharged. portion washed, onto drum, additional amounts water. washed transferred to letdown less zone in was collected. After connection between collection sealed, that change will not effect zone. gradually reduced removed. back up so it ready accept from filter.