大豆油氢化反应釜数值模拟及工艺优化

以一级大豆油为液相、Pt/C催化剂为固相,釜体为圆柱体,釜体高度为180 mm,内径为120 mm,液面高度为130 mm,利用FIUENT软件对大豆油氢化反应釜进行液固两相数值模拟,发现倾斜式搅拌桨距反应釜底部高度80 mm、桨叶直径40 mm、搅拌速率300 r/min时流体流动及催化剂分布最佳,并以模拟的主要参数制备了高压反应釜。高压反应釜内一级大豆油添加量90.0 g、Pt/C催化剂添加量0.15%(m/m),充入8 MPa的CO2气体,后充入H2保持反应釜内总压为12 MPa,通过优化得出最佳反应温度97℃、反应时间87 min、搅拌速率285 r/min时,氢化后大豆油的碘值为79.50 g I2/100 g,说明模拟准确,为展示大型设备油脂氢化过程提供理论依据。

Numerical Simulation of Reaction Kettle and Optimization of Reaction Conditions for Soybean Oil Hydrogenation

The hydrogenation of soybean oil in a cylindrical reaction kettle (180 mm high with an internal diameter of 120 mm) with first-grade soybean oil as liquid phase and Pt/C catalyst as solid phase was investigated by numerical stimulation using the FIUENT software. It was found that the fluidity of the liquid phase and catalyst distribution were optimal using a tilting blade 40 mm in diameter 80 mm above the bottom of the reaction kettle at a stirring speed of 300 r/min. A high pressure reaction kettle was developed using the major simulation parameters. After adding 90.0 g of first-grade soybean oil and 0.15% Pt/C catalyst (m/m) to the reaction kettle, CO2 was initially introduced to a pressure of 8 MPa, followed by H2 to a final pressure of 12 MPa. Under the optimized reaction conditions: temperature, 97 ℃; time, 87 min; and stirring speed 285 r/min, the iodine value of hydrogenated oil was 79.50 g I2/100 g. In conclusion, the simulation was accurate and thus could provide the theoretical basis for displaying the hydrogenation process in large equipment.