CH4 ------>(lln,1500) C2H2 + H2
HC=HC + HCl-----> (HgCl2, 150-200) CH2-CH
.......................................................................Cl (vinyl clorua)
n CH2-CH ------------>(xt,to,p) -(CH2-CH-)n (poli vinyl clorua PVC)
.............Cl............................................Cl