Vinyl chloride is a gas, mainly used as a precursor for Polyvinyl Chloride, or PVC. Its chemical formulae is C2H3Cl.
HCl + C2H2 -> C2H3Cl
Hydrogen chloride is produced from the direct reaction of Chlorine and Hydrogen:
Cl2 + H2 → 2 HCl
Chlorine gas is the byproduct of the production of caustic soda, or Sodium Hydroxide (NaOH). Caustic soda is produced by the electrolysis of sodium chloride(NaCl-table salt) using the Chloralkali process.
Hydrogen can be obtained by electrolysis of water.