木质甾醇分子蒸馏废弃物的催化酯化及柱层析精制植物蜡研究OA

Using lignosterol molecular distillation waste as raw material,a green process route for the synthesis of high-purity plant wax based on directional catalytic conversion of fatty acids was developed.The plant wax was refined by column chromatography and the performance of the refined plant wax was analyzed.The results showed that the catalytic esterification process conditions optimized by single-factor and orthogonal experiments were as follows:20 g raw material,3 g p-toluenesulfonic acid,10 g docosanol,reaction temperature of 100℃and reaction time of 5 h.Under these conditions,the purity of crude plant wax product reached 80.15%.After further purification by silica gel column chromatography,the purity of plant wax product was as high as 94.10%,the acid value of product was reduced from 123.44 mg/g of raw material to 0.40 mg/g,the saponification value was reduced from 154.5 mg/g of raw material to 60 mg/g,and the deacidification rate was more than 99%.And the obtained product exhibited a white color and excellent thermal stability.Compared with other commercial waxes,the refined plant wax possessed comprehensive advantages of extremely low acid value(0.4 mg/g),white color,moderate melting point(45℃),suitable hardness(0.5 HA),and low volatile content(0.22%).