Summary
Euphorbia lathyris, a plant which has been proposed as an ‘energy farm’ candidate yields a total of 35% of its dry weight as simple organic extractables. Chemical analyses of the extracts show that 5% of the dry weight is a mixture of reduced terpenoids, in the form of triterpenoids, and 20% of the dry weight is simple sugars in the form of hexoses. The terpenoids can be converted to a gasoline-like substance and the sugars can be fermented to alcohol. Based on a biomass yield of about 25 dry tons ha−1 year−1, the total energy that can be obtained from this plant in the form of liquid fuels is 48 MJ ha−1 year−1, 26 MJ in the form of hydrocarbons and 22 MJ in the form of ethanol. A conceptual process study for the large scale recovery ofEuphorbia lathyris products indicates that this crop is a net energy producer. Several lines of investigation have been started to increase the hydrocarbon yield of this plant. Tissue cultures ofE. lathyris have been established and will be used for selection, with the aim of regenerating a superior plant. Biochemical studies have been initiated to elucidate regulation of terpenoid metabolism. Future plans include eventual genetic engineering to select the most desirable plant for hydrocarbon production.
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References
M. Calvin, Bioscience29, 533 (1979); Naturwissenschaften67, 525 (1980).
R. Sachs, Agronomic Studies withE. lathyris—A Potential Source of Petroleum-like Products, in: Energy from Biomass and Wastes, V. Institute of Gas Technology, in press 1981.
E.K. Nemethy, J.W. Otvos and M. Calvin, J. Am. Oil chem. Soc.56, 957 (1979).
E.K. Nemethy, J.W. Otvos and M. Calvin, Pure appl. Chem., in press (1981).
P.B. Weisz, W.O. Haag and P.G. Rodewald, Science206, 57 (1979).
W.O. Haag, P.G. Rodewald and P.B. Weisz, Catalytic Production of Aromatics and Olefins from Plants Materials. Presented at ACS National Meeting, Las Vegas, Nevada, August 1980.
J.D. Johnson and C.W. Hinman, Science208, 460 (1980).
E. K. Nemethy, J.W. Otvos and M. Calvin, High Energy Liquid Fuels from Plants, in: Fuels from Biomass. Ed. D.L. Klass and G.H. Emert. Plenum Press, New York, in press (1981).
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This work was supported by the Assistant Secretary for Conservation and Solar Energy, Office of Solar Energy, Solar Applications for Industry Division of the US Department of Energy under Contract No. W-7405-ENG-48.
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Calvin, M., Nemethy, E.K., Redenbaugh, K. et al. Plants as a direct source of fuel. Experientia 38, 18–22 (1982). https://doi.org/10.1007/BF01944519
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DOI: https://doi.org/10.1007/BF01944519