I recently saw an article over on Jalopnik mentioning about Audi’s plant in Dresden that is producing e-diesel.
It seems like a simple enough process, however I’m sure that we would need a chemical engineer or two to fully explain the process to us. From a very high level, Audi generates electricity and uses that to break down water at very high temperatures into Hydrogen and Oxygen. The Hydrogen is then fed into a reactor with captured Carbon Dioxide and again using high temperatures, they produce something that they are calling Blue Crude. Blue Crude, which is comparable with crude oil, is then processed into things like e-diesel.
The output of the plant is still small, about 3000 liters per month, but it seems like a step in the right direction.