The chemical compositions of biodiesel are analyzed by gas chromatograph-mass spectrometer (GC-MS), and theirs molecular structure are investigated on the basis of the hybrid orbital theory. Cold filter plugging point (CFPP) of biodiesel is studied by CFPP tester, the solution crystallization theory and the similarity-intermiscibility principle. Good correlation models are proposed for prediction biodiesel CFPP by chemical compositions and CFPP of biodiesel-petrodiesel blends by biodiesel ratio. The study shows that biodiesel is mainly composed of SFAME (C14:0C24:0) and UFAME (C16:1C22:1, C18:2and C18:3). Carbon atoms of the alkyl for SFAME arrange in a zigzag pattern by CCC=109.5°. C-C carbon atoms of the alkyl arrange in a zigzag pattern by CCC=109.5°, too, carbon chain is curved by C=C in CCC=122.0°, and curved degree increases with increasing unsaturated degree. CFPP of biodiesel is mainly determined by chemical compositions. CFPP increases with the amount and carbon chain length of SFAME. CFPP of biodiesel-petrodiesel blends is mainly determined by chemical compositions and ratio of biodiesel. To lower SFAMEC20biodiesel, such as PME, CSME, WME, SBME and RME, it blending with-10PD can formed a eutectic mixture. CFPP of the eutectic mixture is-12 °C. The biodiesel ratio for the lowest CFPP rang increases with decreasing SFAME. Such as, SFAME contents in PME, CSME, WME, SBME and RME are 35.86, 32.12, 31.04, 18.29 and 14.69 w% respectively, and the range of biodiesel ratio is 520, 1020, 2030, 3050 and 4060 v% respectively. To higher SFAMEC20biodiesel, such as PNME, CFPP increases with PNME ratio.
The chemical compositions of cottonseed oil biodiesel (CSME) are analyzed by using the gas chromatograph-mass spectrometer (GC-MS). The cold flow properties of CSME is studied by cold filer plugging point (CFPP) tester and crystallization mechanism of biodiesel, three approaches for enhancing cold flow properties of CSME are put forward: crystallization fractionation; blending with winter petrodiesel; and treating with cold flow improver (CFI) additives. A significant correlation model is proposed for predicting CFPP by CSME blending ratio. The study shows that the CSME is mainly composed of saturated fatty acid methyl esters (SFSMEs): C14:0~C24:0 and unsaturated fatty acid methyl esters (UFAMEs): C16:1~C22:1, C18:2 and C18:3. The mass fraction of SFAME and UFAME is 32.12 and 66.19%, respectively. The CFPP of CSME is 6 °C. Crystallization fractionation and blending with-10PD decrease the CFPP of CSME to-1 °C and-12 °C, respectively. Adding Flow Fit, Flow Fit K and T818 additives 1.5 v% decreases the CFPP of CME and CME/-10PD to 0 and-26 °C, respectively. This study has effectively enhanced cold flow properties of CSME and provides technical support for using CSME.
The compositions and kinematic viscosity of Pistacia Chinensis-based biodiesel (PCME) are investigated. Viscosity temperature equations are proposed for predicting kinematic viscosity of PCME and its blends with 0 petrodiesel (0PD) /-10 petrodiesel (-10PD) at different temperature. In this work, we show that PCME is mainly composed of fatty acid methyl esters of 14-24 even-numbered C atoms: C14:0-C24:0, C16:1-C22:1, C18:2-C20:2 and C18:3. PCME has higher kinematic viscosity and unfavorable viscosity temperature property, its kinematic viscosity (40 °C) is 5.99 mm2/s. An approach to reduce viscosity and enhance viscosity temperature property is put forward: blending with 0 PD/-10PD.
The compositions and crystallization process at low temperature of palm-based biodiesel (PME) are investigated. In this work, we show that PME is mainly composed of fatty acid methyl esters of 14-24 even-numbered C atoms: C14:0-C24:0, C16:1-C22:1, C18:2, and C18:3. Palm-based biodiesel crystallization comprises three steps, viz., forming supersaturated solution, nucleation and ester crystal growth; the driving force for saturated fatty acid methyl esters nucleation is the degree of supersaturation. The rate equation of nucleation is put forward. The objective of this research is to provide theoretical support for hindering the ester crystal nucleation and growth, and improving the cold flow properties of PME.
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