Biobutanol is an advanced biofuel that offers a number of advantages and can help accelerate biofuel adoption in countries around world. It provides greater options for sustainable renewable transportation fuels, reduces dependence on imported oil, lowers greenhouse gas emissions, and expands markets for agricultural products worldwide - Source - Biobutanol fact sheet

Biobutanol – From Wikipedia - Butanol (C4H10O) or butyl alcohol is an alcohol that can be used as a solvent or fuel. Biobutanol refers to butanol that has been produced from biomass. Biobutanol is produced by a microbial fermentation, similar to ethanol and can be made from the same range of sugar, starch or cellulosic feedstocks. Biobutanol production is currently more expensive than ethanol so it has not been commercialized on a large scale. However, biobutanol has several advantages over ethanol and is currently the focus of substantial research and development.

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Dupont, BP to Produce Biobutanol - Butanol as a fuel has been around a long time, but the cost to produce it was never competitive with gasoline. Using plant sugars as a feedstock, DuPont and BP believe they can favorably compete with gasoline

Butanol - An Energy Alternative? - What is butanol? How is it produced? And how should the ethanol community feel about this potential alternative fuel?

Butanol is a 4-carbon alcohol (butyl alcohol). Biobutanol is butanol produced from biomass feedstocks. Currently, butanol's primary use is as an industrial solvent in products such as lacquers and enamels - Source