Glycerolysis of Soybean Oil with Crude Glycerol Containing Residual Alkaline Catalysts from Biodiesel Production |
| |
Authors: | David A Echeverri Fernando Cardeño Luis A Rios |
| |
Affiliation: | 1.Applied Physical–Chemical Processes Group,University of Antioquia,Medellín,Colombia |
| |
Abstract: | The glycerolysis reaction of soybean oil was evaluated using crude glycerol obtained from the transesterification of soybean
oil with methanol, catalyzed by sodium methoxide and sodium hydroxide, without any purification step other than the methanol
removal. Crude glycerol with the lower content of remaining inorganic catalyst produced the highest concentration of monoglycerides
(about 42%). The effect of the addition of water on the glycerolysis reaction was analyzed, evidencing a low formation rate
of products in the first stages of the reaction due to the transformation of the inorganic catalyst to soaps, which are weaker
bases. The sample of crude glycerol that led to the best results was evaluated at several temperatures. It was observed that
the reaction with crude glycerol exhibits a lower formation rate of monoglycerides at low temperatures (160 and 180 °C) compared
with the reaction with pure glycerol and catalyzed with NaOH. This behavior was explained by the lower activity of the soaps
present in the crude glycerol respect to the inorganic base. Above 200 °C the reaction is very fast and the monoglycerides
formed are consumed to produce diglycerides. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|