Chemistry — The Contact Process

Industrial manufacture of sulfuric acid.

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digraph Contact {
  rankdir=LR;
  node [shape=box, style=rounded];
  "S or sulfide" -> "SO2" [label="burn in air"];
  "SO2" -> "SO3" [label="V2O5, 450C"];
  "SO3" -> "Oleum H2S2O7" [label="absorb in H2SO4"];
  "Oleum H2S2O7" -> "Sulfuric acid H2SO4" [label="+ water"];
}