High-pressure steam distillation with compression (HPSDC) is a wood compression molding technology methodology. Raw material is compressed in a steam autoclave, and the extracted distillate is collected by the instrument. In this study, we applied HPSDC to branches and leaves of Japanese cedar (Cryptomeria japonica) and Japanese cypress (Chamaecyparis obtusa), and investigated the conditions necessary for obtaining both essential oil and solid fuel. The quantity of oil distilled within 40 minutes using HPSDC (13.2-15.6 and 26.4-33.6 g/㎏) was more than that obtained from conventional distillation in after 10 hours (3.80and 11.4 g/㎏). The amount and aromatic quality of the oil obtained at 140℃ (0.4 MPa) was better than that of 180℃ (1.0 MPa) using conventional methods. The bulk density of branch and leaf residue from Japanese cedar and Japanese cypress improved 18 fold (440 ㎏/㎥) and 7 fold (460 ㎏/㎥), respectively. Moreover, these residues satisfied the requirements of refuse derived fuel.

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