Showing papers on "Eucalyptus oil published in 1986"

Eucalyptus oil as a component of petrol ethanol fuel blends

Abstract: The use of ethanol as a petrol extender is well known, but small amounts of water in these gasohol blends can cause phase separation in storage tanks and engine fuel lines, resulting in increased corrosion, poor engine performance and starting difficulties. The addition of a small proportion of eucalyptus oil as a cosolvent overcomes these problems under normal conditions, increasing the water tolerance significantly. When this fuel replaces petrol, there is little change in octane rating or engine performance, and emission levels are generally lower (a).

Composition for the external treatment of psoriasis

Abstract: Composition for the external treatment of psoriasis consisting essentially of soap-free syndets, eucalyptus oil and optionally water. It contains 3-20% eucalyptus oil and can contain 10-60% water. For use, the composition is applied as a foam to the skin, left to act for a short time and then rinsed off.

Eucalyptus oil: Sources, analysis and chemical properties

Abstract: A rapid and accurate solvent extraction - gas chromatographic analytical procedure was developed for the combined qualitative and quantitative chemical analysis of terpenoids from the leaves of eucalypts. The solvent extraction method was also applied successfully to the dry weight determination of the plant materials. The proposed method is efficient in time, cost and space. In comparative studies, it was shown to be more reliable than previous techniques. Using the new procedure, leaf oils of naturally occurring eucalypts in Western Australia were analysed systematically for the first time. Eucalyptus Kochii subsp. kochii and E. kochii subsp. plenissima were selected as the outstanding oil producing species yielding up to 8% on a dry weight basis. Analysis of the volatile oil revealed a composition of 90% 1,8-cineole and 5% other monoterpenoids. The significant seasonal trends and intraspecies variation in the essential oil yield were investigated over a two year period. The volatile oil composition patterns of various eucalypts obtained from high resolution capillary gas chromatography were shown to serve as finger prints, providing additional information at species and subspecies level to assist in the more difficult Eucalyptus taxonomic problems. Eucalyptus oil and its main components were investigated as potential cosolvents for aqueous ethanol/petrol fuel mixtures. Results showed that the incorporation of 1 to 3% eucalyptus oil or its main components such as 1,8-cineole increased the water tolerance and long-term phase stability of the fuel mixtures. Eucalyptus-derived fuels were found to have calorific values in the range of 4000 to 4500 kJ/kg similar to those of petroleum fuels. Liquid-liquid equilibrium data for the system unleaded petrol/ ethanol/water/1,8-cineole, and the ternary system ethanol/water/1,8-cineole were investigated isothermally. An apparatus replacing the less sensitive visual observation and facilitating cloud point determination was designed for this purpose. Ternary phase diagrams were determined, complete with tie-lines, thus fully characterizing the two-phase area. The tie-line data were correlated by the methods of Hand and Othmer-Tobias. A brief account of the history, economics and future viability of the eucalyptus oil industry is presented.

Contact Dermatitis Due To Eucalyptus Oil.

Abstract: Out of 6 patients having air-borne-contact dermatitis, 2 showed a positive patch test with eucalyptus oil, while out of 26 patients having contact dermatitis due to other agents such an cosmetics, topical drugs and wearing apparel taken as controls, only one was positive with eucalyptus oil.