首页 | 本学科首页   官方微博 | 高级检索  
     检索      


Analysis of thermal and oxidative stability of biodiesel from Jatropha curcas L. and beef tallow
Authors:Erisandro S Silva  Marta M Conceição  Eduardo H S Cavalcanti  Valter J Fernandes Jr  Ana C D Medeiros  Antonio G Souza
Institution:1. Universidade Federal de Campina Grande, CES, Campus de Cuité, CEP 58175-000, Cuité, PB, Brazil
2. Instituto Nacional de Tecnologia, Rio de Janeiro, RJ, Brazil
3. Universidade Federal do Rio Grande do Norte, Natal, RN, Brazil
4. Universidade Estadual da Paraíba, Campina Grande, PB, Brazil
5. Universidade Federal da Paraíba, Jo?o Pessoa, PB, Brazil
Abstract:The oxidation of oils and biodiesels occurs due to several factors: the quantity of double bonds and the presence of allylic and bis-allylic hydrogens. Esters (biodiesel) that have large amounts of unsaturated fatty acids are more susceptible to oxidation than saturated. The aim of this work was to analyze the thermal and oxidative stability of ethyl biodiesel from Jatropha curcas L. and beef tallow by thermogravimetric, pressure differential scanning calorimetry, and PetroOxy methods. The samples of biodiesel from beef tallow present higher oxidation stability compared to biodiesel from J. curcas. In relation to calorimetric curves of biodiesel from J. curcas and beef tallow stored by 60 days without and with antioxidant, there was verified displacement of peak temperature of the transition to higher temperatures, respectively. Just a sample of biodiesel from beef tallow stored for 60 days with 3,000 ppm of antioxidant t-butyl-hydroxyquinone was within the standard established by Brazilian National Agency of Petroleum, Natural Gas, and Biofuels (ANP). The biodiesel from beef tallow was more stable in terms of thermal and oxidative stability than biodiesel from J. curcas. The thermal and oxidative stability of biodiesel depends on its chemical structure; this corroborates the fact that the oils with a predominance of saturated fatty acids are more stable than the unsaturated.
Keywords:
本文献已被 SpringerLink 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号