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Analytical design of tonnage plant for the separation of high purity Nitrogen, Oxygen and Argon from atmospheric air

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  1. Abstract of the study
  2. Introduction
  3. List of nomenclature
  4. The air separation technology and its use
    1. Air booster separation
    2. Air separation
  5. Design of rectification column
  6. Selection of the materials for cryogenic section of air plant
  7. Data analysis
  8. Conclusion
  9. References

Air is a mixture of various gases like as nitrogen, oxygen, argon, hydrogen, helium, neon, krypton, etc. These gases can be separated at cryogenics temperature by liquefying the components at different temperature & pressure. This paper presents the latest technology in bulk production of high purity of nitrogen, oxygen & argon from air, and analytical process design for a 1250 ton / day plant and comparing the data with actual existing plants. The liquefaction of air to produce oxygen was the first engineering application of cryogenics1 and was initially used around the beginning of this century. Today, four-quarters of a century later, it is useful to conduct a review of air separation plant design. This paper summarizes the considerations for analytical design, & materials of construction for air plant design.

[...] AIR BOOSTER SEPARATION It is then cooled in the main heat exchanger (E3116) against a stream of internally compressed liquid oxygen which is, in turn, evaporated and warmed up. To cover the refrigeration requirement of the process, part of the boosted air is taken, after the intercooler, from an intermediate stage of the booster air compressor, transferred to the main exchanger (E3116) and withdrawn from the middle section after having been cooled against returning products. It is then expanded in the expansion turbine (X3471, generator braked), passed through the liquid / gas separator 3432) and fed into the bottom of the low pressure column (T3211). [...]

[...] The liquid argon is pumped from this storage tank to the required product gas pressure and is passed back to the main exchanger (E3116) of the air separation cold box where it is vaporised as product argon gas. DESIGN OF RECTIFICATION COLUMN If the feed mixture contains more than two components, then select two key components from all the components of feed mixture Decide the operating pressure of the distillation column. At the operating pressure, find the vapour-liquid equilibrium data. [...]

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