Patent ID: 9144750
Filing Date: 2015-09-29
Classification: B01D,C07C

Abstract:
1. A dispersion medium replacement apparatus for replacing a first dispersion medium in a starting slurry composed of the first dispersion medium and crystal terephthalic acid with a second dispersion medium, comprising: (1) a dispersion medium replacement tank, (2) a cyclone-shaped nozzle positioned in an 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 lower end, (3) a feed portion feeding the starting slurry to the cyclone-shaped nozzle, (4) a feed portion of the second dispersion medium located in a lower portion of the replacement tank, wherein the second dispersion medium flows upwardly through the replacement tank, (5) a discharge line discharging a replaced slurry mainly composed of the crystal terephthalic acid and the second dispersion medium from the lower portion of the replacement tank, and (6) a discharge line mainly discharging the first dispersion medium from the upper portion of the replacement tank; wherein: (i) the feed portion of (3) is placed in order that the starting slurry is tangentially fed to the circular portion of the cyclone-shaped nozzle so as to allow the starting slurry to move circularly along an inner wall of the circular portion, and (ii) the starting slurry which moves circularly is flown from the opening of the cyclone-shaped nozzle to contact with the second dispersion medium which flows upwardly through the replacement tank, thereby dispersing the starting slurry in the second dispersion medium.