Coal liquification

[caffeinated21]

Would be really cool to be able to liquify coal into petroleum. Imagining a building that takes a small amount of hydrogen and coal and outputs petroleum, making your late game hatch-coal production useful for space travel. 

[Alfons100]

There is liquified coal (Carbon) in the game, perhaps it requires liquified coal instead of solid coal to add an extra step. The issue is that it melts ingame at 3551*C, maybe it gets toned down to compensate. Coal doesn't have a whole ton of uses lategame other than Ceramics and Steel, so I like this change.

[caffeinated21]

I’m imagining something more like this: https://en.m.wikipedia.org/wiki/Coal_liquefaction

rather than burning coal into refined carbon and liquefying it, this is a chemical process to convert coal hydrocarbons to petrol