Tags: 'Hazira complex',
GAIL,
'mixture of hydrocarbons',
CST,
'hydrogen sulphide',
ONGC,
'sweetening of gas',
'ST',
'Central Excise Department (CED)',
'excise duty (ED)',
'tariff entry',
'fertilizers',
'power',
petrochemicals,
'central excise notification',
NTPC