The Factorio Calculator can solve this too: https://kirkmcdonald.github.io/calc.html#data=0-17-60&cp=3&min=4&p=coal&belt=express-transport-belt&dm=s3&items=rocket-fuel:r:225&modules=coal:null:null:null Thanks a lot for posting that link! I did not know the site so far.

Because I kept running low on rocket fuel, I created a coal liquefication setup to turn coal into rocket fuel. The blueprint is an evolution of the setup by @vanatteveldt (https://forums.factorio.com/viewtopic.php?t=51253). Also you can read up on some thoughts about coal to rocket fuel by @iceman_1...