公开(公告)号：BG107233A

公开(公告)日：2003-07-31

申请号：BG10723302

申请日：2002-10-29

Applicant: BASF AG

Inventor： ALLEN PETER M ,  GAHN CHRISTOPH ,  RIEKER CHRISTOPHER W ,  SCHNEIDER HEINZ-WALTER ,  WAGNER ROBERT

IPC: B01D9/02 ,  B01D9/00 ,  B01D

Abstract: The invention relates to a device and to a method for crystallizing substances from solutions of dispersions containing said substances in a crystallizer that comprises a classifying zone (3) and that is further provided with a) an inner (1) and an outer (2) circuit systems, the inner circuit system (1) being disposed in the crystallizer, the inlet of the outer circuit system (2) being linked with the inner circuit system (1) via a classifying zone (3), the outer circuit system (2) being disposed outside the crystallizer, the outlet of the outer circuit system (2) being linked with the inner circuit system (1) of the crystallizers, and a device for dissolving crystals being disposed in the outer circuit system (2) upstream of the outlet; b) a feed line (4) for the solution and/or dispersion on the crystallizer or on the outer circuit system; and c) the outlet (5) for dispersions that is disposed on the crystallizer or on the outer circuit system. The inventive device is especially characterized in that it is additionally provided with a line (8) for returning/guiding the dispersion that interlinks the outer and the inner circuit system (1; 2) and/or with a line (8) for returning/guiding the dispersion whose inlet and outlet are linked with the inner circuit system (1). 7 claims, 5 figures