Patent ID: 6376404
Filing Date: 2002-04-23
Classification: B01J,C01B

Abstract:
Process for the production of shaped high-performance adsorbents, from spherically pre-formed materials whose fixed carbon solids content with regard to dry substance is at least 12%, by means of steam activation under an inert gas in an indirectly heated rotary tunnel kiln, characterised in that the spherically pre-formed materials are pre-dried in a rotary tunnel dryer with 4-fold product turnover per kiln rotation and with a space/time ratio of from 1 to 2.5 m3/h using hot gas to a residual moisture content of 25%, the pre-dried semi-finished articles are carbonised in batches with 6-fold product turnover per kiln rotation and with a space/time ratio of from 5 to 10 m3/h and with a reduced pressure on the flue-gas side of 1.5-3.0 mm water column in an inert-gas flow in an indirectly heated rotary tunnel kiln to a fixed carbon content of from 80 to 97%, and the carbonised semi-finished articles are then activated in batches with 8-fold product turnover per kiln rotation and with a space/time ratio of from 1 to 5 m3/h with a reduced pressure on the flue-gas side of 0.05-1.0 mm water column with the addition of from 0.2 to 0.3 kg/h.kg of steam in an inert-gas flow in an indirectly heated rotary tunnel kiln.