Second-generation biofuels

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The term "second-generation" biofuel has been used to designate multiple meanings:

  • The customary usage of the term designates a biofuel obtained from a feedstock that cannot be used except through some novel, intermediate process. An example of this is cellulosic ethanol, the production of ethanol from woody materials for which the long chains of cellulose must be broken down before conversion to ethanol. Another important example are BTL-fuels (biomass-to-liquids) that are produced from different types of biomass by gasification and synthesis of the fuel from the obtained gas. (The "first generation" of biofuels, in this sense, are therefore those made more readily and traditionally, such as ethanol -- ethyl alcohol -- distilled from grains, sugarcane, potatoes and fruit, in which the shorter starch molecules are more directly converted to ethanol through fermentation.)
    • "Second generation biofuel technologies are able to manufacture biofuels from biomass."Wikipedia definition
  • Because of the difficulty in making new technologies, such as producing ethanol from grasses, technologically and economically feasible, the term "second generation" biofuels has by extension also come to be used for biofuel technologies that are sufficiently advanced or experimental in nature as of the present.
    • This definition was used by Galp Energia, a Portuguese oil and natural gas company [1]

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Liquid biofuels edit
Oils & fats: Biodiesel | Pure plant oil (PPO)/Straight vegetable oil (SVO) | Renewable diesel
Oil feedstocks: Animal fat, oil palm, rapeseed, soybeans, etc.
Alcohols: Bio-ethanol | Biobutanol - Alcohol feedstocks: cellulosic, sugarcane, corn, sugarbeets, etc.
Biomass-to-Liquids (BTL): Pyrolysis oil | Methanol | Dimethyl ether (DME) - Biomass feedstocks

Other: ETBE | biokerosene


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