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Liquefaction of gases? Answered

After separating Hydrogen and Oxygen from water (through electrolysis), how should I go about Liquefying and storing these gases? One method of liquefaction that I've come across is here ( http://1.bp.blogspot.com/_OGu0H7TFUno/SLI8QOVkemI/AAAAAAAAABk/Y0fenD3BvbE/s1600-h/ln2_generator.jpg ), and another is here (http://www.gizmology.net/liquid_air.htm) Both of these include compression, but the latter cools the gas by expanding the room-temperature gas, and therefore cooling it. Which method is best? Are there any others?



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10 years ago

You'll probably need liquid nitrogen, at least, cooling the equipment before you have much of a chance of liquifying either H2 or O2. Creating LN2 is much easier, and since you're going to need it I'd recommend you start there and move to the others only after you've got this under control. It also has the advantage that it is much, Much, !!MUCH!! safer, from both temperature and reactivity points of view. BTW, the details vary somewhat but most refrigerant systems operate by compressing the refrigerant, letting the heat of compression escape, then letting it expand (which will draw heat from its surroundings). If you separate the compression and expansion heat exchangers, you've moved heat from one place to another. For purposes of liquifying gas, you need to set things up so the whole machine gets progressively colder until it reaches the point where the gas will liquify at reasonable pressure.