Patent ID: 7637965
Filing Date: 2009-12-29
Classification: B01D,C07C

Abstract:
1. A process for controlling a hydraulic wash column which has a cylindrical shell ( 1 ) which delimits the column and within which one or more filter tubes ( 2 ) extend through the column parallel to the cylinder axis and have, in the vicinity of the second end of the column, at least one filter ( 3 ) in the filter tube wall which forms the sole direct connection between the filter tube interior under the pressure P 1 and the interior of the column, in which at least one stream of a suspension ( mother liquor ( the mother liquor and, optionally control liquor flow in the column form a crystal bed ( the crystal bed, by virtue of the force resulting from the hydraulic flow pressure drop of the mother liquor and, optionally control liquor flow in the column, is transported ( crystals are removed ( the removed crystals are melted ( the position of the buildup front is controlled with the aid of the flow rate of control liquor conducted into the wash column and/or with the aid of the flow rate of the suspension ( wherein the flow rates of the control liquor and/or suspension (