Radzi Salina Mat, Mohamad Rosfarizan, Basri Mahiran, Salleh Abu Bakar, Ariff Arbakariya, Rahman Mohammad Basyaruddin Abdul, Rahman Raja Noor Zaliha Raja Abdul
Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia.
J Oleo Sci. 2010;59(3):127-34. doi: 10.5650/jos.59.127.
The kinetics of wax ester synthesis from oleic acid and oleyl alcohol using immobilized lipase from Candida antartica as catalyst was studied with different types of impeller (Rushton turbine and AL-hydrofoil) to create different mixing conditions in 2l stirred tank reactor. The effects of catalyst concentration, reaction temperature, and impeller tip speed on the synthesis were also evaluated. Rushton turbine impeller exhibited highest conversion rate at lower impeller tip speed as compared to AL-hydrofoil impeller. A second-order reversible kinetic model from single progress curve for the prediction of fractional conversion at given reaction time was proposed and the corresponding kinetic parameter values were calculated by non-linear regression method. The results from the simulation using the proposed model showed satisfactory agreement with the experimental data. Activation energy shows a value of 21.77 Kcal/mol. The thermodynamic parameters of the process, enthalpy and entropy, were 21.15 Kcal/mol and 52.07 cal/mol.K, respectively.
以南极假丝酵母固定化脂肪酶为催化剂，研究了在2L搅拌釜式反应器中，使用不同类型的搅拌桨（如Rushton涡轮桨和AL-翼型桨）来创造不同的混合条件下，由油酸和油醇合成蜡酯的动力学。同时评估了催化剂浓度、反应温度和搅拌桨叶尖速度对合成反应的影响。与AL-翼型桨相比，Rushton涡轮桨在较低的桨叶尖速度下表现出最高的转化率。提出了一个基于单一进程曲线的二阶可逆动力学模型，用于预测给定反应时间下的转化率，并通过非线性回归方法计算了相应的动力学参数值。使用该模型进行模拟的结果与实验数据显示出令人满意的一致性。活化能为21.77千卡/摩尔。该过程的热力学参数，即焓和熵，分别为21.15千卡/摩尔和52.07卡/摩尔·开尔文。
