Assess the potential of ethanol as an alternative fuel and discuss the advantages and disadvantages of its use
There are both great advantages and great disadvantages associated with the use of ethanol as an alternative fuel to petroleum.
- Unlike petroleum, ethanol is a renewable resource
- Ethanol burns more cleanly in air than petroleum, producing less carbon (soot) and carbon monoxide
- The use of ethanol as opposed to petroleum could reduce carbon
dioxide emissions, provided that a renewable energy resource was used
to produce crops required to obtain ethanol and to distil fermented
- Ethanol has a lower heat of combustion (per mole, per unit of volume, and per unit of mass) that petroleum
- Large amounts of arable land are required to produce the crops required
to obtain ethanol, leading to problems such as soil erosion,
deforestation, fertiliser run-off and salinity
- Major environmental problems would arise out of the disposal of waste fermentation liquors.
- Typical current engines would require modification to use high concentrations of ethanol
A dual-fuel gas station (ethanol and petroleum) in Sao Paulo, Brazil