A METHOD FOR PRODUCING SYNGAS USING CATALYTIC REVERSE WATER GAS SHIFT

The present invention relates to a method for producing syngas using a catalytic reverse water gas shift (RWGS) reaction, the method at least comprising the steps of: a) providing a feed stream (10) comprising at least hydrogen (Hz) and carbon dioxide (CO2); b) heating the feed stream (10) provided in step a) in a first heat exchanger (3) thereby obtaining a first heated feed stream (20); c) introducing the first heated feed stream (20) into a first RWGS reactor (2) and subjecting it to a first catalytic RWGS reaction, thereby obtaining a first syngas containing stream (30); d) cooling the first syngas containing stream (30) obtained in step c) in the first heat exchanger (3) against the feed stream (10) provided in step a), thereby obtaining a first cooled syngas stream (40); e) separating the first cooled syngas stream (40) obtained in step d) in a first gas/liquid separator (6) thereby obtaining a first water-enriched stream (60) and a first water-depleted syngas stream (50); f) heating the first water-depleted syngas stream (50) obtained in step e) in a second heat exchanger (13) thereby obtaining a heated first water-depleted syngas stream (70); g) introducing the heated first water-depleted syngas stream (70) obtained in step f) into a second RWGS reactor (12) and subjecting it to a second catalytic RWGS reaction, thereby obtaining a second syngas containing stream (80); h) cooling the second syngas containing stream (80) obtained in step g) in the second heat exchanger (13) against the first water-depleted syngas (50) stream obtained in step e), thereby obtaining a second cooled syngas stream (90); i) separating the second cooled syngas stream (90) obtained in step h) in a second gas/liquid separator (16) thereby obtaining a second water-enriched stream (110) and a second water-depleted syngas stream (100); j ) separating the second water-depleted syngas stream (100) obtained in step i) in a CO2 removal unit (8) thereby obtaining a CO2-enriched stream (120) and a CO2- depleted syngas stream (130); k) combining the CO2-enriched stream (120) obtained in step j) with the feed stream (10) provided in step a) and/or the first water-depleted syngas stream (50) obtained in step e); wherein the temperature of the first syngas containing stream (30) obtained in step c) and the second syngas containing stream (80) obtained in step g) is kept below 600°C, preferably below 550°C; and wherein the first and the second RWGS reactors (2,3) each comprise a multi-tub