松脂基生物柴油制备条件的优化

Optimization of the reaction conditions for the preparation of biodiesel from oleoresin

为了优化超临界甲醇与松脂制备松脂基生物柴油的反应条件,采用均匀设计和回归分析方法,以松脂酯化率和蒎烯转化率为指标,考察了松脂与松节油质量比、松脂与甲醇质量比、反应温度及反应时间对松脂酯化率、蒎烯转化率的影响,经优化筛选得到最佳反应条件为:松脂与松节油的质量比为10∶8,反应温度为350℃,反应时间为4.0 h,松脂与甲醇质量比为10∶7,松脂酯化率和蒎烯转化率分别为94.68%、99.71%;并对反应产物进行理化性能检测,得到结果:酸值为4.06 mgKOH/g,密度(20℃)为956 kg/m3,黏度(40℃)为9.421 mm2/s,灰分为0.001%,十六烷值指数为32,硫含量为0.016%,闪点为47℃,产物理化性能与柴油理化性能相近,与0#柴油复配后其主要理化性能指标达到现行轻柴油国家标准技术要求。

In order to optimize the reaction conditions for the preparation of oleoresin-based biodiesel from supercritical methanol and oleoresin, influencing factors on the esterification yield of oleoresin and conversion of pinene were determined by uniform design and regression analysis algorithm. The optimal conditions obtained were： the mass ratio of oleoresin to turpentine 10： 8, temperature at 350 ~C, reaction time 4. 0 h and the mass ratio oleoresin esterification fraction and pinene up of oleoresin to methanol 10： 7. At these conditions, to 94. 68% and 99.71%, respectively, were ob- rained. The physicochemical properties for the reaction products were analyzed. The acid value of the reaction products was 4. 060 mgKOH/g, the density at 20 ℃ was 956 kg/m3 , dynamic viscosity at 40 ℃ was 9. 421 mm2/s, carbon residue was 0. 001% , cetane index was 32, sulfur content was 0. 016% , flash point was 47 ~C. The products mixture is similar to the diesel. Besides, when the products were mixed with 0# diesel, the mixture achieved the biodiesel standard.