LanzaTech, a competitor in this space, just made a big announcement that they've had excellent results with a scaled up bioreactor that "eats" co2 and makes acetone or isopropanol. They claim a 120L bioreactor (compared to the 1.5L mentioned here) and high yield, both of which they say is an indication they are ready for large scale.

https://www.chemistryworld.com/news/reprogrammed-bacterium-t...