Method of cooling a gas without liquid evaporation for Sci-fi novel

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user2765977

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user2765977 Asks: Method of cooling a gas without liquid evaporation for Sci-fi novel
sorry for the amateur question here.

I know little about science, but regardless am writing a fictional amateur novel that deals with a lot of chemistry stuff, especially gasses.

My protagonist needs a clever method of cooling a gas. He has access to several gasses (CO2, O2, H2, nitrogen) in varying temperatures (70c and up). Unfortunately no water (at least not more than a few bottles). The atmosphere he is working under (planet atmosphere) is in the range of 150c and at a pressure of roughly 150kpa in the novel.

He also has access to sci-fi style manufacturing machines that can simply 'make' parts, like pipes, valves, pumps, that sort of thing.

I am looking for a clever way or really any way at all, that he can use to cool down some O2 to at least under 40c in such a situation.

My amateur reading online suggests the main way, is via liquid evaporation, but I doubt that would work in the above scenario easily.

Does anybody have any ideas? Is this even possible?

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