Chemistry — Catalytic Cracking

{
  "elements":[
    {"data":{"id":"crude","label":"Crude oil"}},
    {"data":{"id":"frac","label":"Fractional distillation"}},
    {"data":{"id":"heavy","label":"Long-chain fractions"}},
    {"data":{"id":"cat","label":"Catalytic cracking (zeolite)"}},
    {"data":{"id":"petrol","label":"Petrol (alkanes)"}},
    {"data":{"id":"alkene","label":"Alkenes (for polymers)"}},
    {"data":{"source":"crude","target":"frac"}},
    {"data":{"source":"frac","target":"heavy"}},
    {"data":{"source":"heavy","target":"cat"}},
    {"data":{"source":"cat","target":"petrol"}},
    {"data":{"source":"cat","target":"alkene"}}
  ],
  "layout":{"name":"breadthfirst","directed":true}
}