Zinc carboxylic salts used as catalyst in the biodiesel synthesis by esterification and transesterification: Study of the stability in the reaction medium
作者:Deborath M. Reinoso、Daniel E. Damiani、Gabriela M. Tonetto
DOI:10.1016/j.apcata.2012.09.014
日期:2012.12
transesterification of soybean oil with methanol using zinc carboxylic salts as Lewis acid catalysts was studied. The esterification of fatty acids was also researched. In both reactions, the stability of the catalyst in the reaction medium was examined. Zinc carboxylic salts of different chain lengths, Zn(CnH2n+1COO)2 with n = 1, 11, 15, and 17, and Zn(C17H33COO)2 (zinc(II) acetate, laurate, palmitate, stearate
生物柴油是通过可再生资源(例如植物油和动物脂肪)的催化酯交换反应生产的。由于其对环境的好处,它是柴油的有吸引力的替代品。 在这项工作中,研究了使用锌羧酸盐作为路易斯酸催化剂,大豆油与甲醇的酯交换反应。还研究了脂肪酸的酯化。在两个反应中,检查了催化剂在反应介质中的稳定性。 不同链长的羧酸的锌盐,锌(C ñ ħ 2 Ñ 1 COO)2与Ñ = 1,11,15,和17,和Zn(C 17 H ^ 33 COO)2(锌(II)乙酸盐,月桂酸分别制备了棕榈酸酯,硬脂酸酯和油酸酯,并通过X射线衍射,FTIR光谱和热重分析对其进行了表征。 在大豆油在100°C的酯交换反应中测试Zn盐2小时。他们提出了88%至94%的油转化率,脂肪酸甲酯(FAME)的产率在71%至74%之间,并且在三个连续的测试中均保持稳定。乙酸锌不稳定。盐在140°C的反应介质中转化为甘油酸锌(月桂酸锌,棕榈酸锌和硬脂酸锌仅部分存在)。