| Non-selective catalyst R（JM9955） and selective catalyst M were used in the hydrogenation of tallow fatty acid in the reactor. The effects of temperature, pressure, catalyst dosage and hydrogenation time on iodine value and octadecadienoic acid value of hydrogenated tallow fatty acid needed to meet the industrial indexes of raw material of SBR emulsifier were investigated. The results revealed that the iodine value and octadecadienoic acid value of hydrogenated tallow fatty acid with better hydrogenation effect were 34.9 g(I)/100 g and 0.8% respectively under the conditions of temperature 155℃, pressure 4 MPa, hydrogenation time 45 min, catalyst dosage 0.075% with R as catalyst; the iodine value and octadecadienoic acid value of hydrogenated tallow fatty acid with the best hydrogenation effect were 37.5 g(I)/100 g. and 0.257% respectively when the temperature was 160℃, pressure was 2.5 MPa, catalyst dosage was 0.15%,hydrogenation time was 45 min and M was used as catalyst, and the product could meet the industrial index requirements of raw material of SBR emulsifier. Catalyst M was more favorable for the selective hydrogenation of tallow fatty acid than catalyst R. |
