Anti-Oxidation Stability and its Mechanism of Soybean Biodiesel

Abstract

The anti-oxidation stability of soybean biodiesel (SME) was evaluated on an oxidation simulator set up by the author. The results showed that oxidative stability of SME was worse than that of petrodiesel by exhibiting higher acid values and peroxide values, as well as greater viscosity increases after oxidation. Furthermore, a conjecture was taken about the configurational changes and the oxidation mechanisms of unsaturated fatty acid methyl ester molecules in the oxidation process, according to the principles of free radical reactions and the results of both infrared and ultraviolet spectroscopic analysis. An idea was put forward that, during oxidation, cis-trans isomerization might occur in unsaturated fatty acid methyl ester molecules and conjugated double-bond might produce due to transfer of double-bond.

A Progressive Combined Variable Selection Method for Near-Infrared Spectral Analysis Based on Three-Step Hybrid Strategy

“…Most of the variables selected were located in the region from 1,600 to 1,750 nm. e result was consistent with the vibration absorption wavelength of C � C in oil [20]. is proves that the SiPLS-IVSO-BOSS method can effectively screen out the information related to oil in the corn spectrum.…”