Abstract:

Patchouli is not only a Chinese herb, but also a natural perfume plant. Patchouli concrete and oil can be extracted from the plant.Single factor experiments and orthogonal experiments were adopted to investigate the effects of extraction pressure, extraction temperature, carbon dioxide flow rate and extraction time on the yield of the concrete of patchouli stem and leaf with supercritical carbon dioxide fluid.The optimum technical parameters of obtaining the concrete of patchouli stem were extraction pressure 15 MPa, extraction temperature 42℃, carbon dioxide flow rate 37 L·h^-1, extraction time 3.5 h.The yield of the concrete of patchouli stem was 1.28%.The optimum technical parameters of obtaining the concrete of patchouli leaf were extraction pressure 18 MPa, extraction temperature 39℃, carbon dioxide flow rate 37 L·h^-1, extraction time 3.5 h.The yield of the concrete of patchouli leaf was 2.53%.