Method for generating gas mixtures comprising carbon monoxide and carbon dioxide for use in synthesis reactions
A method for the generation of a gas mixture comprising carbon monoxide, carbon dioxide and optionally hydrogen for use in hydroformylation plants or in carbonylation plants, including mixing an optional steam with carbon dioxide in the desired molar ratio, feeding the resulting gas to a solid oxide electrolysis cell (SOEC) or an SOEC stack at a sufficient temperature for the cell or cell stack to operate while effecting a partial conversion of carbon dioxide to carbon monoxide and optionally of steam to hydrogen, removing some or all the remaining steam from the raw product gas stream by cooling the raw product gas stream and separating the remaining product gas from a liquid, and using said gas mixture containing CO and CO 2 for liquid phase synthesis reactions utilizing carbon monoxide as one of the reactants while recycling CO 2 to the SOEC or SOEC stack.
1 . A method for the generation of a gas mixture comprising carbon monoxide, carbon dioxide, and hydrogen for use in hydroformylation plants or in carbonylation plants, comprising the steps of:
evaporating water to steam,
mixing the steam with carbon dioxide in a desired molar ratio to form a resulting gas, and
feeding the resulting gas to a solid oxide electrolysis cell (SOEC) or an SOEC stack at a sufficient temperature for the SOEC or SOEC stack to operate while supplying an electrical current to the SOEC or SOEC stack to effect a partial conversion of carbon dioxide to carbon monoxide and of steam to hydrogen forming a raw product gas comprising CO, H 2 , and CO 2 on a cathode side of the SOEC or SOEC stack, and forming anode side gas comprising O 2 on an anode side of the SOEC or SOEC stack,
removing some of or all remaining steam from the raw product gas by cooling the raw product gas allowing for condensation of at least part of the steam as liquid water and separating a remaining product gas comprising CO, H 2 , and CO 2 from the liquid water, and
using the remaining product gas for a liquid phase er carbonylation, the carbonylation utilizing carbon monoxide as a reactant in the carbonylation, while utilizing the CO 2 to form a CO 2 -expanded liquid (CXL) reaction medium for carbonylation, wherein
the SOEC or SOEC stack is operated to perform a reverse water gas shift (RWGS) reaction within pores of a cathode of the SOEC or SOEC stack converting CO 2 and H 2 to CO and H 2 O.
2 . The method according to claim 1 , wherein a molar ratio between steam and carbon dioxide in the resulting gas is in the interval 0-3.
3 . The method according to claim 1 , wherein the temperature, at which CO is produced by electrolysis of CO 2 in the SOEC or SOEC stack, is around 700° C.
4 . The method according to claim 1 , wherein a molar ratio between steam and carbon dioxide in the resulting gas is in the interval 0-2.
5 . The method according to claim 1 , wherein a molar ratio between steam and carbon dioxide in the resulting gas is in the interval 0-1.5.
6 . The method according to claim 1 , further comprising recycling CO 2 remaining from after the carbonylation to the SOEC or SOEC stack.
7 . The method according to claim 1 , comprising utilizing carbon monoxide and hydrogen as reactants in hydroformylation.
8 . The method according to claim 1 , wherein the liquid phase carbonylation is a liquid phase hydroformylation.