Application of Recovering Wastewater from Eucalyptus Oil by Pyrolysis Treatment

The production of noble Eucalyptus oil from Eucalyptus leaves brings a mass of extracting wastewater pollutive to water environment. In order to better utilize and recover the productive wastewater from the Eucalyptus oil, we used pyrolysis-GC/MS to analyze the possible top value-added components of benzene/ethanol extractives of leaves of two Eucalyptus cultivars, i.e. E. dunnii and E. grandis. Relative content of each component was determined by area normalization. 22 compounds representing 92.12% of the benzene/ethanol extractive of E. dunnii leaves were identified, and the main constituents were 5-(acetylaminomethyl)-4-amino-2-methyl-(15.40%), hexadecanoic acid (10.25%), benzaldehyde,4-hydroxy-(8.64%), xylitol (7.57%), cyclopentanol (7.10%), 2-propenoic acid,3-(4-hydroxyphenyl)-(4.41%), eucalyptol (1.38%), etc. 28 compounds representing 98.41% of the benzene/ethanol extractive of E. grandis leaves were also identified, and the main constituents were ethanol,2-butoxy-(21.70%), benzene,methyl(1-methylethyl)-(15.61%), 17-octadecenal (15.25%), 1-hexacosanal (9.45%), 1-eicosanol (6.92%), cyclotetracosane (6.67%), .alpha.-phellandrene (3.75%), etc. The results of function analyses showed that the benzene/ethanol extractives of leaves of both E. dunnii and E. grandis are abundant in materials of noble natural medicines, and also contains constituents which can be developed into top value-added materials of cosmetic, biofuel and industrial solvent.