you can make it into ammonium water if you want those properties for heat transfer, otherwise you can make it into nitric acid, which can then be boiled or frozen into hydrogen and polluted oxygen, otherwise you just store it or vent it to space
when you get to using the oil processing its an infinite resource

@vectrobe, thanks! I didn't know about the nitric acid! I use that in my ball crusher mill.

its heat capacity varies wildly from state to state so do with that what you will