Patent ID: 8038906
Filing Date: 2011-10-18
Classification: C01B,C07C,D21C

Abstract:
1. A process for the adjustment of the composition of a synthesis gas produced in a high temperature downflow black liquor gasifier, comprising the steps of (a) generating a gasifier effluent stream from black liquor in said gasifier by means of a blast and optionally an atomising stream; (b) optionally quenching the gasifier effluent stream with a gas stream to form a gas quenched effluent stream; (c) quenching the gasifier effluent of step (a) or the gas quenched effluent gas stream of step (b) with a water stream to form a raw synthesis gas; (d) further cooling and cleaning and separating the raw synthesis gas to form a purified unprocessed synthesis gas with an H (e) partly converting the purified synthesis gas to dimethyl ether in a synthesis section, producing at least a product stream of DME and a hydrogen rich purge stream of processed synthesis gas; (f) splitting and recycling individual or combinations of split streams of the processed synthesis gas from the synthesis section or the unprocessed synthesis gas to step (a) and/or step (b), wherein a by-product stream of CO