The easiest way to produce acetylene - the reaction of calcium carbide with water.I'm sure many children remember how to throw pieces of carbide into puddles.Immediately it began a rapid hiss and Carbide literally "melt" into the foam formed.This reaction is as follows:

CaC2 + 2H2O = C2H2 + Ca (OH) 2
If a technical carbide contaminated with impurities, the reaction is accompanied by an unpleasant odor due to the formation along with acetylene small amounts of toxichydrogen sulphide gas, phosphine etc.
Currently, the main method for industrial production of acetylene - cracking (breaking of bonds to C-C under high temperatures and in the presence of catalysts) of natural gas methane.It is the most
economically and technologically justified because of the presence of readily available and inexpensive raw materials.In two ways: either to pass through the fiery methane electrodes (the temperature of the reaction volume of the order of 1600 degrees), followed by rapid cooling, or by using the heat generated by the partial combustion of acetylene.
In the first case, the reaction is thus:

2SN4 = C2H2 + 3H2
In the second case:

6SN4 + 4O2 = C2H2 + 8N2 + 3SO + CO2 + 3H2O