Chapter 7 · 7 questions · Graded in-browser · Saved locally

Final review — explain the whole mechanism as one loop

Tie individual pieces of knowledge together through case-based practice, and be able to say where equilibrium, rate, separation, recycle, and feed conditioning each come in.

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At the end, explain it as "the whole loop," not just "the reaction equation"

Once you have come this far, being able to state N₂ + 3H₂ ⇌ 2NH₃ is not enough. The goal is to walk through, as one flow, where you look at equilibrium, where you look at rate, and where you think about separation, recycle, and purge.

In the case problems that follow, we start by asking "where does it break?" Working backward from trouble makes the role of each unit easier to remember.

Comprehension check for this chapter

Cases 33–34

Tell purge trouble and catalyst-poison trouble apart.

A Inerts build up and the partial pressures drop B The catalyst is automatically refreshed C The equilibrium disappears entirely D NH₃ becomes lighter than nitrogen

A The synthesis catalyst B The color of the product tank C The exterior walls of the plant building D The coefficients in the reaction equation

Comprehension check for this chapter

Cases 35–36

Check the green-ammonia transition and a summary of the full picture.

A The central reaction N₂ + 3H₂ ⇌ 2NH₃ B The chemical symbol for nitrogen C The concept of catalyst poisons D All of A–C

A The central reaction is reversible B The catalyst affects rate C Recycling unreacted gas is important D Purge is used to hold back inert accumulation

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Final review — explain the whole mechanism as one loop

At the end, explain it as "the whole loop," not just "the reaction equation"

Cases 30–32

Q30. A teammate proposes, "Let's sharply drop the temperature to raise the equilibrium yield." What is the most appropriate response?

Q31. If the N₂ : H₂ feed ratio drifts to 1 : 2, which problem shows up first?

Q32. If post-reaction cooling and separation fail to take enough NH₃ out, what tends to happen in the loop as a whole?

Cases 33–34

Q33. If the feed contains argon and the purge valve is closed almost completely, what should you be most concerned about?

Q34. If upstream desulfurization breaks down and sulfur compounds reach the reactor, which unit should you worry about first?

Cases 35–36

Q35. Suppose a steam-methane-reforming-based plant is converted to green ammonia using renewable-electrolysis H₂. What basically does not change?

Q36. Select all correct statements about the big picture of the Haber–Bosch process.

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