Patent ID: 8247604
Filing Date: 2012-08-21
Classification: B01D,C07C

Abstract:
1. A method of replacing a dispersion medium with another, comprising the steps of: feeding a starting slurry composed of a first dispersion medium and a terephthalic acid crystal to a cyclone-shaped nozzle disposed in an upper portion of a replacement tank of a dispersion medium replacement apparatus; contacting the starting slurry discharged from the cyclone-shaped nozzle with a second dispersion medium which is fed from a lower portion of the replacement tank and flows upwardly through the replacement tank; and mainly discharging a replaced slurry composed of the terephthalic acid crystal and the second dispersion medium from the lower portion of the replacement tank and mainly withdrawing the first dispersion medium from the upper portion of the replacement tank, the cyclone-shaped nozzle being composed of a circular portion having a vertically extending axis and an opening disposed at a vertically lower end, the starting slurry being tangentially fed to the circular portion so as to allow the starting slurry to move circularly along an inner wall of the circular portion, and the starting slurry which moves circularly being discharged from the opening, thereby dispersing the starting slurry in the second dispersion medium.