CH4 ⇒⇒C2H2⇒⇒C6H6
CH4⇒⇒CH3Cl C6H6 + CH3Cl ⇒ C6H5-CH3 + HCl
C6C5-CH3 + 3Cl2 ⇒ C6H5-CCl3 + 3HCl
C6H5-CCl3 + 2H2O ⇒ C6H5-COOH + 3HCl
teoretic : nCH4 = 7·nC6H5-COOH
nC6H5-COOH = 61/122 ·100/70 = 5/7 kmoli nCH4 = 7·5/7 = 5 kmoli
V CH4 pur = 5·22,4 = 112m³
V CH4 impur = 112·100/80 = 140m³