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Chemistry — The Haber Process

Industrial synthesis of ammonia.

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digraph Haber {
  rankdir=LR;
  node [shape=box, style=rounded];
  "N2 + 3H2" -> "Compressor" [label="about 200 atm"];
  "Compressor" -> "Reactor (Fe catalyst)" [label="about 450 C"];
  "Reactor (Fe catalyst)" -> "Condenser" [label="equilibrium mix"];
  "Condenser" -> "Ammonia (liquid)" [label="cooled"];
  "Condenser" -> "Reactor (Fe catalyst)" [label="recycle unreacted gas"];
}