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| Mechanism exploration of forming carbon deposit for Jatropha oil used directly as diesel fuel |
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| DOI： |
| KeyWord:Jatropha oil carbon deposit mechanism compound biodiesel |
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| Abstract: |
| When Jatropha oil was used directly as diesel fuel to burn in a single cylinder diesel engine for a long time, the carbon deposit and coking were serious. In order to explore its mechanism, the degumming experiment and distillation experiment of Jatropha oil were carried out and the carbon residue value and content of actual gum were determined. The infrared spectrum of the degummed Jatropha oil, carbon residue materials and actual gum were determined. The results showed that the gum in oil was one of the causes of carbon deposits. The average relative molecular weight of Jatropha oil increased and its degree of unsaturation decreased with distillation time prolonging. The tendency of Jatropha oil to produce carbon deposits or coke was related to its degree of unsaturation. The carbon residue value and the content of actual gum of Jatropha oil could be effectively reduced by adding antioxidants. The carbon residue value could be effectively reduced by adding Lewis alkali detergents in Jatropha oil, which indicated that the coke formation was associated with carbocation aromatization mechanism. The FT-IR of actual gum showed that there was a moderate intensity ether bond absorption peak in the fingerprint region. It proved that in the presence of oxygen, free radical polymerization was occurred in Jatropha oil, which was easy to coke. The FT-IR of carbon residue materials showed that there was the aromatic ring absorption in the third peaks region, and the aromatization product was the precursor of high carbon hydrocarbon. |
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