摘要
本文以油酸和甲醇为原料,对甲苯磺酸/甲基三苯基溴化鏻形成的低共熔溶剂为催化剂,考察醇酸摩尔比、催化剂用量、反应时间及反应温度等因素对油酸甲酯收率的影响,并通过响应面分析法优化生物柴油的制备工艺。结果表明,对苯甲磺酸与甲基三苯基溴化鏻摩尔比为2:1时所形成的低共熔溶剂(DES-2)具有最好的催化活性;以DES-2为催化剂时,生物柴油的最佳合成条件为:催化剂用量为油酸质量的1.08%,醇酸摩尔比5.8:1,反应时间2.8 h,温度373 K,此条件下,生物柴油的收率达97.3%,该结果与模型预测值基本相符。优化条件下,生物柴油合成反应的活化能为34.98 kJ/mol,动力学方程为:r=-(dC_A)/(dt)=1.44×10~3exp(34.98/t)C_A^(1.23)。
Methyl oleate was synthesized from oleic acid and methanol with deep eutectic solvent prepared from p — toluenesulfonic acid with the methyltriphenylphosphonium bromide as catalysts. The effects of alcohol/acid molar ratio, the amount of catalyst, reaction time and reaction temperature were also investigated. Meanwhile, the optimum conditions were obtained by response surface methodology( RSM). Higher catalytic activity was obtained when the molar ratio of p — toluenesulfonic acid to methyltriphenylphosphonium bromide was 2:1. Accordingly, optimum reaction conditions were found with catalyst amount of 1. 08 wt% of oleic acid, methanol/oleic acid molar ratio of5.8:1,reaction time of 2. 8 h at a temperature of 373 K, contributing to a maximum biodiesel yield of 97. 3%. Moreover, these values were in close agreement with the mathematical model. Under optimized conditions, the active energy was 34.98 kJ/mol, and the kinetic equation isr =(dCA)/(dt) = 1. 44 × 103 exp(34.98)/T)CA1.23.
作者
李佳敏
寿飞艳
颜诗婷
李芳浩
鲁艮春
姚兰英
韩晓祥
Li Jiamin;Shou Feiyan;Yan Shiting;Li Fanghao;Lu Genchun;Yao Lanying;Han Xiaoxiang(Department of Applied Chemistry,Zhejiang Gongshang University,Hangzhou 310018)
出处
《中国粮油学报》
EI
CAS
CSCD
北大核心
2019年第2期79-86,共8页
Journal of the Chinese Cereals and Oils Association
关键词
低共熔溶剂
生物柴油
响应面法
动力学
deep ectectic solvent(DES)
biodiesel
response surface methodology
kinetic study
作者简介
李佳敏,女,1999年出生,本科,应用化学;通信作者:姚兰英,女,1979年出生,实验师,食品化学。
