Coal gasification, is that when you treat it with heat and waterv apor? That gives the CO-containing gas then?
CO isn't necessarily the last step. Operations can go on to H2
or to hydrocarbons. https://en.wikipedia.org/wiki/Coal_gasification
When I checked the state of the art a few centuries ago, gas-fired power plants burned liquid natural gas in a gas turbine and used the exhaust to heat water send to a vapour turbine, so-called "combined cycle". H2
wouldn't fit easily there, CO less badly, cryogenic or liquid hydrocarbons would be nice.
C3-C4 seems very good, thats just "Gasol"
fraction contains propane, propene, butane, isobutane, butene, isobutene and minor components. Plans to use it are regularly abandoned when oil is cheap, so it uses to be torched at the oil and gas wells, and refineries produce again ethylene and propylene by cracking heavy fractions. Propylene isn't any more a cheap by-product as polypropylene demand has grown. Refineries produce it on purpose and transform ethylene into propylene. So in the present context of prices and embargoes, catching and transporting this fraction from the wells would make sense. It wouldn't even emit more CO2
This fraction is more easily liquefied than methane, it's easier to burn too: denser, lower autoignition. Adaptation from methane is essentially a burner with adapted mix ratio. While gas turbines are more demanding, I hope the adaptation can go in few months and be reversible.
Other uses too are reasonably easy, daily operations of a refinery. The alkylation unit can makes high-octane additives of it. Feeding Diesel and jets is less obvious: they need a low autoignition temperature, hence some straight tails in the molecule, while standard alkylation produces branched molecules. But refineries make long 1-alkenes from ethylene, that's nearer to a synthetic kerosene or gas-oil.
I suggested trialkylamines as a fuel
, easy to produce, good liquid range, tailored combustion properties, there https://www.chemicalforums.com/index.php?topic=56069.msg362592#msg362592 https://www.chemicalforums.com/index.php?topic=103039.msg362089#msg362089
that step would follow the 1-alkene synthesis. Or maybe the complete raw C3-C4 fraction can react with ammonia
, to produce the trialkylamine fuel and leave alkanes useful elsewhere, with easy separation?