Patent ID: 8083818

Claim:
A method of producing synthesis gas by partial oxidation of a carbonaceous stream, wherein the partial oxidation is controlled using an oxygen to carbon ratio, the method comprising at least the steps of: (a) feeding a carbonaceous stream and an oxygen containing stream into a gasification reactor at a selected oxygen to carbon ratio; (b) at least partially oxidising the carbonaceous stream in the gasification reactor, thereby obtaining a gaseous product stream at least containing synthesis gas and a content of CO 2 ; (c) determining the content of CO 2 in the product stream obtained in step (b); (d) comparing the content determined in step (c) with a pre-determined content thereby possibly obtaining a difference value between the content of CO 2 determined in step (c) and the pre-determined content of CO 2 wherein the difference value is expressed as a percentage of the absolute difference between the content of CO 2 in the product stream and the pre-determined CO 2 content relative to the pre-determined CO 2 content; (e) adjusting the oxygen to carbon ratio in step (a) when the difference value obtained in step (d) exceeds a pre-selected value and wherein the pre-selected value is between 0.5% and 5%.