Lesson 2, Topic 4
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Heuristics‐Recycle System

Abdulaziz July 8, 2020
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Some heuristics for recycle system from Seider et al.:
• Introduce purge streams to provide exits for species that enter as impurities in feed or are formed in irreversible side reactions, when these are in trace amounts and/or are difficult to separate.
• Lighter species leave via vapour purge, heavier species via liquid purge.
• Do not purge valuable, toxic or hazardous species (even in small quantities for latter two). Add separators for valuable species and reactors, if possible, to eliminate toxic and hazardous species.
• By‐products that are produced in reversible reactions, in small quantities, are usually recycled to extinction rather than purged or separated.

Young hardworking heavy industry worker in protective suit and helmet using tablet and screwing valve.

// Example: Ammonia production from N2 and H2

The process involves the following reaction at high pressures (200‐400 atm)

N2 + 3H2 ↔ 2NH3

Trace amount of argon accompany nitrogen feed, which is recovered from air, and trance amounts of methane accompany hydrogen, which is produced by steam reforming (CH4 + H2O ↔ 3H2 + CO).

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Valves at gas plant