Aguieiras Erika C G, Veloso Cláudia O, Bevilaqua Juliana V, Rosas Danielle O, da Silva Mônica A P, Langone Marta A P
Escola de Química, Universidade Federal do Rio de Janeiro, Avenida Athos da Silveira Ramos, 149, 21949-909 Rio de Janeiro, RJ, Brazil.
Enzyme Res. 2011;2011:432746. doi: 10.4061/2011/432746. Epub 2011 Jun 20.
Estolides are vegetable-oil-based lubricants obtained from oleic acid or any source of hydroxy fatty acids. In this work, the estolides synthesis from oleic acid and methyl ricinoleate (biodiesel from castor oil), using immobilized commercial lipases (Novozym 435, Lipozyme RM-IM, and Lipozyme TL-IM) in a solvent-free medium was investigated. Acid value was used to monitor the reaction progress by determining the consumption of acid present in the medium. Novozym 435 showed the best performance. Water removal improved the conversion. Novozym 435 was more active at atmospheric pressure. Novozym 435 was reused four times with conversion reaching 15% after the fourth reaction at 80°C. Estolides produced under the reaction conditions used in this work presented good properties, such as, low temperature properties as pour point (-24°C), viscosity (23.9 cSt at 40°C and 5.2 cSt at 100°C), and viscosity index (153).
埃斯托酯是一种以植物油为基础的润滑剂，由油酸或任何羟基脂肪酸来源制得。在这项工作中，研究了在无溶剂介质中使用固定化商业脂肪酶（诺维信435、Lipozyme RM-IM和Lipozyme TL-IM）由油酸和蓖麻油酸甲酯（蓖麻油生物柴油）合成埃斯托酯。通过测定介质中酸的消耗量，用酸值来监测反应进程。诺维信435表现出最佳性能。除水提高了转化率。诺维信435在常压下更具活性。诺维信435重复使用了四次，在80℃下第四次反应后转化率达到15%。在本工作所用反应条件下制备的埃斯托酯具有良好的性能，如低温性能，倾点为-24℃，粘度在40℃时为23.9厘斯，在100℃时为5.2厘斯，粘度指数为153。
