The best replacement for propylene is acetylene.

The best alternatives to propylene are rated as following:
★★★★★  acetylene
★★★★★  ethylene glycol
★★★★  ethylene
★★  polypropylene
★  propene
★  mapp gas
  cortislim
  chemtane
  acetylene welding

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Google Trends

Scale is based on the average worldwide traffic of propylene in all years. Click on graph for more.
propylene
acetylene
ethylene glycol