Methylation of wood fatty and resin acids for production of biodiesel

► Biodiesel from the wood oil of Oriental spruce (Spruce orientalis) with non-catalytic supercritical methanol transesterification. ► Separation of wood fatty and resin acids. ► Methylation of resin acids with diazomethane. ► Methylation of resin acids with supercritical methanol. ► Crude tall oil from sulfate soaps by Kraft pulping process. Crude tall oil is separated from recovered black liquor in the Kraft pulping process. ► Separation of crude tall oil to fatty and resin acids. ► Crude tall oil was fractioned to fatty acids, rosin and pitch like residue. ► Temperature, molar ratio of methanol, time, free fatty acid content and water content are variables.