Currently you can revert liquid form plasma (which is condensed gas so to speak) into solid plasma in enough quantity using frost oil, however you cannot reclaim the plasma gas or any gas besides from sucking them up into a canister or expelling them in space.
Ok so what's the suggestion?
My suggestion is that much like how you mix potassium & water for a explosive mixture at heat, gases get the same rework of chemistry as anything else as to create new gas compounds, reclaim gases into solid/liquid matter states or make entirely new products and chemistry trees out of combinations of gases and have some compound reactions.
To do some really ADVANCED reactions, i propose a brand new machine which acts as a chem-master as well as a intermediary injector to mix gases and chemicals using regular beakers (as stablising agent or cryobeakers/blue space beakers would be required) put inside toxins by default. I have a WIP sprite here i've held onto for a while.

This machine is two tiles long, and has a pipe port in its left hand side either to be hooked up directly to a canister secured onto a pad or otherwise fed via pipes.
Holy water & superheated plasma for example created virutually inside this machine, combines to make hellfire, inextinguishable napalm with a orange tinge, wheras freon gas can be heated slightly to become frost oil & works as a catalyst with water for making snow.
But wait, i work on chemistry and dont have a scrubber or any of that stuff!
- Do not be alarmed, i have thought and prepared for this eventuality also, chemistry & toxins (not to mention the CMO) are to be supplied with handheld scrubbing devices that extract and bottle elements in the air straight into a sterilised vaccum essentially a 40-50 miniature limited edition cryobeaker, there is only 1 between departments. This buys enough time to apply sterilizing agent after dispelling some of the contents in the chem master before adding to other beakers.
> The CMO's hyporspray accepts gases directly, should they want to literally inject it into people choking to death instead of ephedrine, either that or directly inject BZ or whatever.
What a load of hot air
Indeed, most reactions with gas are managed with heat, so the specialist equipment of toxins (not to mention the virtually limitless places in maint where there are toxins outlets, not least to making your own lab) are vital using existing assets like normal chem heaters & industrial gas heaters.
Some products of gas chemistry include
> Fizzy drinks - The bartender gets a small carbon dioxide pump on his soft drink dispenser, some fizzy drinks REQUIRE carbon dioxide injected.
> Fireworks via combining black powder with compounds (and then crafting with paper)
> Huge variable bombs & New combination effects to chems
> Substitute some chems for gases all-together (replace the refrigerators in medbay for a small quanity of freon gas in with the active cryoxodone or pre-cool the cryoxodone that it cools the person it is within)
- Reason for toxins to exist and use the test lab equipment rather than just blowing shit up 24/7 not to say that isn't fun and flesh out that area of the profession.
- In addition, away from the direct chemistry results, both the handheld (& a advanced version with better efficency and capacity at high plasma tech) scrubber and a brand new chrome gas plasma tank made out of plastinium are availible from R&D at high tech
Just a small collection of my thoughts, thank you for reading