Abstract
► 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.
The purpose of the present paper is to evaluate the potentiality of the wood oil of Oriental spruce (Spruce orientalis) for biodiesel production. Two methods have been applied for obtained wood oil with and without solvent such as separation of crude tall oil from sulfate soaps by Kraft pulping process. Production of biodiesel from wood oil follows two steps, first extraction of oil using a solvent (acetone) and then base catalyzed (KOH) or non-catalytic supercritical methanol transesterification. This paper studied the effect of temperature on transesterification of wood oil to find the optimum temperature of maximum biodiesel yield. Transesterification of the wood oils were performed in a 100-mL cylindrical autoclave using supercritical methanol. In a typical run, the autoclave was charged with a given amount of the wood oil (20–25g) and alcohol (20–50g) with changed molar ratios at 500, 525, 550 and 575K. The yield of the biodiesel produced under optimal condition is 96–98%.