US 11,053,517 B2
Intermittent electrolysis streams
Robert John Conrado, Skokie, IL (US); Sean Dennis Simpson, Skokie, IL (US); and Christophe Daniel Mihalcea, Skokie, IL (US)
Assigned to LanzaTech, Inc., Skokie, IL (US)
Filed by LanzaTech, Inc., Skokie, IL (US)
Filed on Apr. 2, 2019, as Appl. No. 16/373,071.
Claims priority of provisional application 62/660,298, filed on Apr. 20, 2018.
Prior Publication US 2019/0323042 A1, Oct. 24, 2019
Int. Cl. C12P 7/26 (2006.01); C12P 5/02 (2006.01); C25B 15/08 (2006.01); C12M 1/00 (2006.01); C25B 1/02 (2006.01); C12P 7/04 (2006.01); C12N 1/20 (2006.01)
CPC C12P 7/26 (2013.01) [C12M 21/12 (2013.01); C12P 5/026 (2013.01); C12P 7/04 (2013.01); C25B 1/02 (2013.01); C25B 15/08 (2013.01)] 17 Claims
 
1. A method of operating a fermentation process with a bioreactor containing a bacterial culture in a liquid nutrient medium, the method comprising:
a. passing a C1 feedstock comprising one or both of CO and CO2 from an industrial process to the bioreactor, wherein the C1 feedstock has a cost per unit;
b. passing a gaseous CO2-containing substrate and/or a water stream to an electrolyzer process to produce an electrolyzer feedstock comprising CO and/or H2;
c. determining if the cost per unit of the electrolyzer feedstock is less than or greater than the cost per unit of the C1 feedstock and if the cost per unit of the electrolyzer feedstock is less than the C1 feedstock cost per unit, passing at least a portion of the electrolyzer feedstock from the electrolyzer process to the bioreactor, to displace at least a portion of the C1 feedstock wherein the electrolyzer feedstock has a cost per unit with respect to H2 given by an equation

OG Complex Work Unit Math
where z represents the cost of power, x represents the electrolysis efficiency, and y represents the yield of ethanol and with respect to CO by an equation

OG Complex Work Unit Math
where z represents the cost of power, x represents the electrolysis efficiency, and y represents the yield of ethanol; and
d. fermenting the culture to produce at least one fermentation product comprising ethanol, wherein the ethanol has a value per unit.