Patent ID: 8470291
Filing Date: 2013-06-25
Classification: C10J,C10K

Abstract:
1. A process to prepare a gas mixture of hydrogen and carbon monoxide from an ash containing carbonaceous feedstock comprising the following steps, (i) partial oxidation of an ash containing carbonaceous feedstock with an oxygen containing gas thereby obtaining liquid ash and a gas mixture comprising hydrogen, carbon monoxide and solids, (ii) separating more than 90 wt % of the liquid ash from the gas mixture before reducing the temperature of the gas mixture, (iii) reducing the temperature of the gas mixture, in the absence of the separated ash, to obtain a cooled gas mixture, (iv) scrubbing the cooled gas mixture by contacting with liquid water to obtain a scrubbed gas and a water effluent containing ash, and (v) separating the ash from the water effluent by means of a decanter centrifuge thereby obtaining a wet ash and a stream of water poor in ash; wherein steps (i) and (ii) are performed in a reactor vessel provided with horizontally firing burner nozzles, which nozzles discharge a gas mixture comprising hydrogen, carbon monoxide and solids into a gasification chamber as present in the reactor vessel, and wherein liquid ash is present on the interior wall of the gasification chamber, wherein the gas mixture is discharged through an opening at the upper end of the gasification chamber and the liquid ash is discharged via an opening at the lower end of the gasification chamber.