Department of Chemical Engineering, Anna University Chennai, Chennai, India.
Bioresour Technol. 2011 Aug;102(15):7289-93. doi: 10.1016/j.biortech.2011.04.100. Epub 2011 May 6.
Al(HSO(4))(3) heterogeneous acid catalyst was prepared by the sulfonation of anhydrous AlCl(3). This catalyst was employed to catalyze transesterification reaction to synthesis methyl ester when a mixed waste vegetable oil was used as feedstock. The physical and chemical properties of aluminum hydrogen sulphate catalyst were characterized by scanning electron microscopy (SEM) measurements, energy dispersive X-ray (EDAX) analysis and titration method. The maximum conversion of triglyceride was achieved as 81 wt.% with 50 min reaction time at 220°C, 16:1 molar ratio of methanol to oil and 0.5 wt.% of catalyst. The high catalytic activity and stability of this catalyst was related to its high acid site density (-OH, Brönsted acid sites), hydrophobicity that prevented the hydration of -OH group, hydrophilic functional groups (-SO(3)H) that gave improved accessibility of methanol to the triglyceride. The fuel properties of methyl ester were analyzed. The fuel properties were found to be observed within the limits of ASTM D6751.
采用无水三氯化铝磺化法制备了 Al(HSO(4))(3)多相酸催化剂。以混合废弃植物油为原料，用该催化剂催化酯交换反应合成甲酯。通过扫描电子显微镜 (SEM) 测量、能谱 (EDAX) 分析和滴定法对硫酸铝氢催化剂的物理化学性质进行了表征。在 220°C、甲醇与油摩尔比为 16:1 和催化剂用量为 0.5wt.%的条件下，反应 50min 时，甘油三酯的最大转化率达到 81wt.%。该催化剂具有较高的酸位密度（-OH、布朗斯台德酸位）、疏水性，可防止-OH 基团的水合，具有亲水性官能团（-SO(3)H），可提高甲醇对甘油三酯的可及性，因此具有较高的催化活性和稳定性。分析了甲酯的燃料性能。发现这些燃料性能均在 ASTM D6751 的限制范围内。
