Chemistry — The Contact Process

Industrial manufacture of sulfuric acid.

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digraph ContactProcess {
  rankdir=LR;
  node [shape=box, style=rounded];
  "S + O2" -> "SO2" [label="burn sulfur"];
  "SO2" -> "SO3" [label="V2O5 catalyst, 450 C"];
  "SO3" -> "Oleum (H2S2O7)" [label="absorb in H2SO4"];
  "Oleum (H2S2O7)" -> "H2SO4" [label="add water"];
}