Danu Charonesukploypon. SYNTHESIS OF ALKOXY UNSATURATED FATTY ACID ESTERS AS BRANCHED POUR POINT DEPRESSANTS. Master's Degree(Petrochemistry and Polymer Science). Chulalongkorn University. Office of Academic Resources. : Chulalongkorn University, 2014.
SYNTHESIS OF ALKOXY UNSATURATED FATTY ACID ESTERS AS BRANCHED POUR POINT DEPRESSANTS
Abstract:
This research aimed to synthesize pour point depressants (PPDs) as chemical additives to improve cold flow properties of palm biodiesel. The additives were synthesized in the form of alkoxy isopropyl esters of oleic and linoleic acid via esterification, epoxidation and alkoxylation reaction, respectively. The synthetic PPDs were characterized by 1H-NMR technique. These synthetic PPDs were blended with palm biodiesel at 150,000 ppm to determine the ability of PPDs in improving cold flow properties. Cloud point (CP) and pour point (PP) were determined according to ASTM standards. The results exhibited that the synthetic pour point depressants can reduced CP and PP of palm biodiesel. The linoleate type pour point depressants can improved these properties better than the oleate type due to increasing in steric hindrance. Moreover, the alkoxy chain length affected to cold flow properties of biodiesel, especially octoxy isopropyl linoleate. This PPD was the linoleate type and longest alkoxy chain length which can reduced CP and PP of palm biodiesel from 20 °C to 14.9 °C and 11.4 °C to 8.5 °C, respectively.