Coal liquefaction is an oil processing recipe that converts Coal, Heavy oil, and Steam into refined petroleum products in an Oil refinery. It consumes 10 Coal, 25 Heavy oil, and 50 Steam over 5 seconds and produces 90 Heavy oil, 20 Light oil, and 10 Petroleum gas. This recipe is part of the oil processing system and provides a way to turn solid fuel and heavy oil into a broader mix of fluids for further refining and production.