Study On Catalytic Hydrogenation Of Pine Gum

Pine gum was hydrogenated on catalyst in a high-pressure agitated autoclave (typeFYX-2G). Quality and quantity of the hydrogenated products were analyzed by gas chromatography. Identified 17 compounds of hydrogenated rosin and 20 compounds of hydrogenated turpentine.The catalytic hydrogenation of pine gum was carried out at the condition of temperature 180C, pressure 8MPa, stirring speed 600r/min and reacted time 120min. Pd/C and Raney-Ni were used as catalysts separately. Compared conversion rate and selectivity of the hydrogenation on these two catalysts. The result showed that the activations of Pd/C and Raney-Ni were similar, but the activation of Raney-Ni was better than Pd/C on selectivity of pinene's hydrogenation.Investigated changes of resin acids, pinene and pinane contents with reacted time at the condition of 170-200C, 8-llMPa and Raney-Ni being as catalyst. It showed that the abietenoic acids and abietanoic acids were produced at the beginning of reaction, the catalytic hydrogenation included parallel reaction and consecutive reaction. Arranged the experiments according to the orthogonal design table at the reacted condition of temperaturel70-200C, pressure 8-llMPa, Raney-Ni content 3-6% (based on pine gum weight) and reacted time 40-100min. Got the order of the affecting factors to reaction: temperature, catalyst content, pressure and time. The optimal process condition of producing hydrogenated rosin was: 200C,10MPa, 6%, lOOmin. The optimal process condition of producing pinane was: 170C, 8MPa, 6%, 40min. Investigated the effects of temperature and pressure to conversion rate and selectivity of the hydrogenation. The result showed that the conversion rate almost reached 100%, the selectivity of producing abietanoic acids increased with the raising of temperature and pressure, but the selectivity of producing cis-pinane decreased. The high quality hydrogenated rosin and pinane could be produced by using series operation condition of temperature (130-200C) and pressure (6-10MPa).