Abstract
The production of oxygen is commercially limited to three different types of supply:1. Delivery and storage of liquid oxygen 2. Vacuum swing adsorption (VSA) system for on-site supply 3. Cryogenic air separation system on-site supplyFigure 3.1 shows the approximate product application ranges of each of these technologies. In general, liquid supply is good when small quantities of product are required. The liquid oxygen produced at a central facility is distributed to a customer’s storage tank. When needed, the liquid oxygen (LOX) is vaporized and warmed up to ambient conditions. The advantage of this type of supply is that there is no major capital investment. The disadvantage is that the unit price of the LOX is relatively high since it includes not only the production costs to make the LOX but also the distribution costs. Even at a high unit cost, liquid supply is generally economical for small supplies or even larger amounts for short duration. Commercial grade LOX is available at 99.5% purity, which is applicable through the range of use purities.
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