改性大豆油硅胶吸附脱色工艺研究

Bleaching of modified soybean oil by silica gel adsorption

研究了硅胶、活性白土、活性炭作为脱色剂对改性大豆油的脱色效果。从硅胶用量、脱色时间以及脱色温度方面系统考察了硅胶对改性大豆油脱色的最佳条件;此外,还考察了脱色后改性大豆油的运动黏度、酸值、倾点的变化情况。结果表明:相同条件下,硅胶脱色效果最好;在硅胶用量1.0%、脱色温度60℃、脱色时间3 h的条件下,以硅胶为脱色剂对改性大豆油进行吸附脱色,脱色率可达37.5%;脱色后改性大豆油运动黏度(40℃)由123.7 mm^2/s降至117.3 mm^2/s,运动黏度(100℃)由20.9 mm^2/s降至16.8 mm^2/s,倾点由34.3℃降至26.5℃,酸值(KOH)由9.9 mg/g降至9.0 mg/g。

The effects of silica gel, activated clay and activated carbon on the bleaching of modified soybean oil were studied. The optimal bleaching conditions of silica gel were systematically investigated from the aspects of silica gel dosage, bleaching temperature and bleaching time. In addition, the changes of properties of modified soybean oil after bleaching were investigated, including kinematic viscosity, acid value and pour point. The results showed that the bleaching effect of silica gel was the best under the same condition. Under the conditions of silica gel dosage 1.0%, bleaching temperature 60℃ and bleaching time 3 h, the bleaching rate of silica gel could reach 37.5%. The kinematic viscosity of modified soybean oil after bleaching reduced from 123.7 mm^2/s to 117.3 mm^2/s at 40℃ as well as reduced from 20.9 mm^2/s to 16.8 mm^2/s at 100℃, the pour point decreased from 34.3℃to 26.5℃, and the acid value reduced from 9.9 mgKOH/g to 9.0 mgKOH/g.