The best replacement for acetylene is propane.

The best alternatives to acetylene are rated as following:
★★★★★  propane
★★★  mapp
★★  propylene
★★  ethylene
★★  lpg
★  mapp gas
★  propane torch
★  propane cutting
★  oxy acetylene
★  propylene gas
  tig
  oxy-propane torch
  oxy propane torch
  propane hotter
  oxy propane
  map gas
  starr gas

Your alternative for acetylene is not listed? Suggest!
Speaking about acetylene, one probably shouldn't forget about bromine.

Other search terms related to acetylene and their ratings are:
★★★★★ bromine
★★★★ bromine water
★★★★ kmno4
★★ ammoniacal silver nitrate
★ ammoniacal cuprous chloride
You have in mind a companion for acetylene and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of acetylene in all years. Click on graph for more.
acetylene
propane
mapp