Patent ID: 6627257
Filing Date: 2003-09-30
Classification: B01J

Abstract:
A process for coating the flow channels in a monolithic, cylindrically shaped catalyst carrier with a coating dispersion, wherein the carrier has two end faces which are connected to each other by flow channels arranged parallel to the axis of the cylinder, comprisingvertically aligning the axis of the cylindrical carrier, placing a predetermined amount of coating dispersion on the upper end face of the carrier and drawing the dispersion through the flow channels under suction, removing excess coating dispersion from the flow channels by emptying the flow channels under suction, and fixing the dispersion coating by calcination, wherein the coating dispersion is drawn through the flow channels under suction at a rate of flow of 0.1 to 1 m/s and that after completion of passage under suction the excess coating dispersion is removed from the flow channels by applying a suction impulse from below, wherein the suction air is drawn through the flow channels under suction at a decreasing rate of flow that begins at a rate of greater than 5 m/s and up to 40 m/s and ends at a lower rate between 40 m/s and 1 m/s and the excess coating dispersion discharged with the air stream is separated from the air stream within a time of less than 100 ms after discharge from the catalyst carrier and the excess coating dispersion is collected in a collection vessel that is not in contact with the air stream.