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- Any form or mixture of gases produced in refineries by distillation, cracking, reforming, and other processes. Principal constituents are methane, ethane, ethylene, normal butane, butylene, propane, propylene, etc. Used as a refinery fuel and as a petrochemical feedstock.
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- Coalbed Methane, Liquefied natural gas (LNG), Liquefied petroleum gas (LPG), Methane (CH4), Natural Gas, Natural gas liquids (NGLs), Pentanes plus, Synthetic natural gas (SNG)