The aim of this study was the determination of optimal conditions of free fatty acid esterification by methanol using acid catalyst, and the calculation of the kinetic parameters of this process.It was found that the reaction rate depends on the amount of the catalyst and the acidity of the reaction mixture. The reaction rate changes also depending on the reaction duration, especially during the first 15 min.Establishing the above mentioned parameters proved the effect of the agents on the reaction rate. Such dependence is characteristic to many heterogeneous processes. The data suggest that having excluded diffusion, the reaction order is about 1. Within the limits of the experimental conditions (free fatty acids 0.162 mol//L-1.948 mol/L, temperature 20-60 7C, constant mixing speed -850 min-1, 1% of catalyst (H 2 SO 4 )) the apparent energy of activation E t is < 13.3 kJ/mol, while pre-exponent A = 1.27. These parameters allow the assumption that diffusion restrictions are characteristic to the entire range of the concentrations and the reaction duration studied.
Biofuels for diesel engines are produced mainly from rapeseed oil in Lithuania and the Member States of the European Union. In order to minimise an adverse impact of biodiesel fuel on the food sector, it is necessary to look for alternative feedstocks for producing biodiesel fuel including the potential utilisation of the new kinds of oilseed crops and various fatty waste. Camelina (Camelina sativa) could be one of the kinds of such oilseed crops, and therefore the physical and chemical parameters of Camelina sativa oil and biodiesel fuel produced from this oil were determined and the conformity of quality parameters with the requirements of biofuel standard was evaluated. It was found that fatty acid methyl esters made from Camelina sativa oil had a high iodine value (164.6÷169.6 g I2 / 100 g oil), and therefore could be used as fuel for diesel engines only in the mixtures with methyl esters produced from animal fat or used for frying oil. It has been established that similar mixtures can contain 50÷60% of Camelina sativa oil methyl esters. The possibilities of increasing oxidation stability as well as improving the cold flow properties of ester mixtures were investigated. The most effective antioxidant – Ionol (optimal dosage of 500 ppm) and the most efficient depressants Wintron XC-30 (optimal dosage – 1500 ppm) and Infineum R-442 (optimal dosage – 1200 ppm) were selected.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.