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World Energy Outlook 2007

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Coal-bed Methane<br />

Methane found in coal seams. Coal-bed methane is a source of unconventional<br />

natural gas.<br />

Coal-to-Liquids<br />

Coal-to-Liquids (CTL) refers to both coal gasification, combined with Fischer-<br />

Tropsch synthesis to produce liquid fuels, and the less-developed direct coal<br />

liquefaction technologies.<br />

Condensates<br />

Condensates are liquid hydrocarbon mixtures recovered from non-associated<br />

gas reservoirs. They are composed of C4 and higher carbon number<br />

hydrocarbons and normally have an API between 50° and 85°.<br />

Dimethyl Ether<br />

Clear, odourless gas currently produced by dehydration of methanol from<br />

natural gas, but which can also be produced from biomass or coal.<br />

Ethanol<br />

Ethanol is an alcohol made by fermenting any biomass high in<br />

carbohydrates. Today, ethanol is made from starches and sugars, but secondgeneration<br />

technologies will allow it to be made from cellulose and<br />

hemicellulose, the fibrous material that makes up the bulk of most plant<br />

matter.<br />

Gas<br />

Gas includes natural gas (both associated and non-associated with petroleum<br />

deposits but excluding natural gas liquids) and gas-works gas.<br />

Gas-to-Liquids<br />

Fischer-Tropsch technology is used to convert natural gas into synthesis gas<br />

(syngas) and then, through catalytic reforming or synthesis, into very clean<br />

conventional oil products. The main fuel produced in most GTL plants is<br />

diesel.<br />

Hard Coal<br />

Coal of gross calorific value greater than 5 700 kcal/kg on an ash-free but moist<br />

basis. Hard coal can be further disaggregated into anthracite, coking coal and<br />

other bituminous coal.<br />

B<br />

Annex B - Abbreviations, Definitions and Conversion Factors 635

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