@hazlin the traditional way of making acetylene is by simply making calcium carbide in an arc furnace and adding water. once upon a time, it was (somewhat) common for people who needed a lot of acetylene to buy calcium carbide pellets in bulk and have their own acetylene generator on the premises, for welding or whatever. acetylene is a pain in the ass to store and transport so generating it on site makes a lot of sense. unfortunately this is basically never done at the end user anymore

they're probably trying to do it in some "environmentally friendly" way with a billion EPA regulations hemming them in