Orthogonal design L9（3^4） was used to investigate the effects of extracting pressure, temperature and extracting time on the yield of irone when orris oil was extracted by supercritieal fluid of carbon dioxide （SCF-CO2）. The optimun parameters obtained were as follows： extracting pressure, 26.0 MPa, extraeting temperature, 55.0℃, extracting time, 2.5 h, when the particle size was 40-60 mesh. The yield of orris oil from orris root was 12.71% under the above eonditions and the content of irone was 39.95% in the preduet. Compared with the co...
