Welcome to our April issue, which casts a critical eye over that mainstay of industrial gas production, air gases. It has been an interesting 12 months. The story of air separation units (ASUs), which make most of the world’s air gases, is one that’s tied up with energy – its cost and its sourcing. That’s because ASUs are huge uses of electrons, around the clock and all over the world. So even if the ASU tech that separates out air gases is stable and well-understood and generally predictable, the energy side of the equation is anything but.
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