Environmental Engineering Reference
In-Depth Information
33.2.9 r EnEwaBlE d iESEl
In addition to biodiesel (mono-alkyl esters of vegetable oils and animal fats), through a hydrotreating
process similar to the processing of petroleum mixtures compositionally resembling petroleum-
based diesel fuel can be obtained from vegetable oils (for example, see Rantanen et al. 2005). This
kind of process has been described for various vegetable oils and could also apply to the feedstocks
discussed in this chapter.
33.3 conclusIons and Future ProsPects
The fact that all biodiesel feedstocks combined do not have the potential to provide sufficient
amounts of biodiesel for replacing all petroleum-based diesel fuel has been a major factor in the
search for additional feedstocks. This search is reflected in the use of vegetable oils as energy
sources summarized in this and other chapters. It is likely that this search will continue in the
future. However, issues such as yield improvement, sustainability, and acceptable fuel properties
will influence the use of any potential feedstock. For many of the emerging feedstocks, these issues
have not been sufficiently determined. Therefore, it remains to be seen which feedstocks will be
able to partially meet the need of yielding fuels that can replace fossil fuels.
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