It's been done before, even in a much simpler way. In the 1920's Viktor Schauberger experimented with water vortex flow in closed containers with carbon dioxide added and he obtained a flammable liquid. And no, it doesn't necessarily take a lot of energy to do it. Water vortex and carbon dioxide atmosphere under pressure will do it after several hours of rotation. The vortex folds the carbon from carbon dioxide right into the water, making hydrocarbons which are fuel…
Audi Has Made Diesel From Water And Carbon Dioxide