Process for the preparation of synthesis gas from black liquor

Details Process for the preparation of synthesis gas from black liquor Process for the preparation of synthesis gas from black liquor

C - Chemistry, Metallurgy

01

B

C01B 3/32 (2006.01) C01B 3/02 (2006.01) D21C 11/00 (2006.01)

Patent

CA 2665050

A process for the adjustment of the composition of a synthesis gas produced in a high temperature 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 appropriate H2/CO ratio; (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. (f) splitting and recycling individual or combinations of split streams of the processed or the unprocessed synthesis gas to step a and/or step (b); and recycling a by-product stream of CO2 being further generated in step (e) in part or completely to step (a) and/or step (b).

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