Abstract: Using Pd/C as catalyst,the hydrogenation of condensed soybean lecithin was carried out in the supercritical CO2 state. The optimal pressure of CO2 in the high-pressure reactor, total pressure after adding H2, ratio of dichloromethane to ethanol, reaction temperature, reaction time, stirring speed, amount of catalyst are determined, 5 MPa,9 MPa,2:1,65℃,70 minutes, 220 r/min and 3.5%, respectively. Under the above conditions the product yield is 92%, and iodine value of lecithin after hydrogenation is 35.5g I2/100g. The product is granular and yellowy. Its anti-oxidation is enhanced, which is benificial for processing, transportation and storage. The dispersion of condensed soybean lecithin in feed is also improved.

Key words: soybean lecithin, H2, supercritical CO2, granular, anti-oxidation