There are good and bad sides to biofuels, as Jane Goodall points out. I will explore this in detail in a series of articles that express my opinion and cite scientific reports or discussions. First, a bullet-point summary of key points is given below.

Much of the good/bad duality of biofuels has to do with the following questions:

  • where do the biofuels come from?
  • what are we destroying in order to generate biofuels?
  • what are we consuming in order to generate biofuels?
  • what are we failing to produce in order to generate biofuels?
  • Many (most) of the crops being planted for biofuels are destined to generate biodiesel, not bioethanol.
  • Some plants grown for fuel are intended to produce a type of diesel called straight vegetable oil (SVO).
    • SVOs contain a number of impurities, at least as far as fuel oil is concerned. Even water is an impurity here.
    • Just as an example, you only have to press the oil out of the olives to remove it.
    • Peanut oil and practical coconut oil can be also be collected mechanically, like pressing olives.
  • Biodiesel is more pure than SVO or WVO (if made properly). It is made by chemically splitting animal fat or vegetable oil into two parts, followed by purification.
  • The standard chemical reaction to make biodiesel uses alcohol (methanol or ethanol) and a catalyst.
  • This reaction, called transesterification, generates fatty acid esters and the byproduct known as glycerol.
  • One example that seems to me to have little or no downside is the generation of biodiesel from fish oil:
    • Fish oil is already generated by the fishing industry.
    • Fish oil is potential waste that already exists and may not be used as efficiently as possible.
    • Fish oil conversion to biodiesel still needs to be pushed forward by invention and commercial development.
  • Another example of a method that exhibits great potential is the conversion of all of a plant’s dried matter (known as biomass) into biodiesel:
    • Plant oils are only about 10% of total plant biomass in most cases
    • Using all the biomass to generate biodiesel captures much more of the value of a plant, and the energy that went into growing it, than using only plant oil does
    • Cellulose and lignins are components of typical biomass and are hard to convert into liquid fuel, compared to oils

© James K. Bashkin, 2007

Technorati Tags:, , , , , , , , , , , , , , , , , ,
Generated By Technorati Tag Generator

Advertisements

  1. 1 Biodiesel | GreenEggsandPlanet

    […] subject and to finish the the rest of the report on biodiesel, read James Bashkin’s “Biodiesel” published at Chemistry for a Sustainable […]




Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s



%d bloggers like this: