Definitions, Sources and Explanatory Notes

 Category:   Petroleum Refining & Processing
 Topic:   Biofuels Operable Production Capacity


Key Terms Definition
Barrel A unit of volume equal to 42 U.S. gallons.
Hydrogen The lightest of all gases, occurring chiefly in combination with oxygen in water; exists also in acids, bases, alcohols, petroleum, and other hydrocarbons.
Isobutane A normally gaseous branch-chain hydrocarbon. It is a colorless paraffinic gas that boils at a temperature of 10.9º F. It is extracted from natural gas or refinery gas streams.
Isohexane A saturated branch-chain hydrocarbon. It is a colorless liquid that boils at a temperature of 156.2 degrees Fahrenheit.
Isooctane Isooctane (C8H18). A saturated branch-chain hydrocarbon with chemical name 2,2,4 Trimethylpentane. It is a colorless liquid that boils at a temperature of 211 degrees Fahrenheit. It defines the 100 point on the octane rating scale.
Isopentane A saturated branch-chain hydrocarbon obtained by fractionation of natural gasoline or isomerization of normal pentane.
Petroleum Administration for Defense (PAD) Districts Geographic aggregations of the 50 States and the District of Columbia into five districts by the Petroleum Administration for Defense in 1950. These districts were originally defined during World War II for purposes of administering oil allocation. Description and maps of PAD Districts and Refining Districts.
Production Capacity The maximum amount of product that can be produced from processing facilities.
Refinery An installation that manufactures finished petroleum products from crude oil, unfinished oils, natural gas liquids, other hydrocarbons, and oxygenates.

For definitions of related energy terms, refer to the EIA Energy Glossary.


  • Energy Information Administration, Form EIA-819, "Monthly Report of Biofuels, Fuels from Non-Biogenic Wastes, Fuel Oxygenates, Isooctane, and Isooctene".
  • EIA Forms & Instructions .
  • Background, Survey Methodology and Statistical Details .

  •   Explanatory Notes

  • Other Biofuels includes renewable diesel fuel, renewable heating oil, renewable jet fuel, renewable naphtha, renewable gasoline, and other renewable fuels.