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9429263 
Journal Article 
Composition and source of residue in fuel supply system of LPG vehicle 
Gao, Y; Li, J; Zhu, CJ 
2007 
0 
Jilin Daxue Xuebao (Gongxue Ban)
ISSN: 1671-5497 
37 
6 
1251-1256 
Chinese 
The composition and the source of the residue formed in the fuel supply system during operation of the LPG vehicle were investigated by means of the specially designed experiment, the dynamometer bench test, the chemical analysis, and the theoretical study. The results showed that the composition of the LPG fuel residue varies with the variation of the LPG composition, especially its contaminants and their contents. The common residues appear to be phthalates, heavy alkanes (C15-C35), elementary sulfur, copper sulfide, and cuprous sulfide, etc. The analyses revealed that the phthalates come from the rubber additives (e.g. phthalic acid dioctyl phthalate), and their content increases with the solubility parameter of the LPG mixture. The heavy alkanes come from the lub oils in the compressor or pump during refining, transport and storage, not from polymerization of mono-alkenes under the strictly limitation of 1, 3-butadiene. The contents of sulfur and copper sulfide depent upon the sulfur content in the LPG, and strict control of the content of elementary sulfur and hydrogen sulfide may decrease significantly the content of the sulfides in the LPG residue Limited use of copper LPG pipeline may restrain the formation of copper sulfide and cuprous sulfide. By means of careful refining and proper controlling LPG composition, the domestic LPG meet the requirements from the LPG vehicle. 
Alkene; LPG; LPG vehicle; Power machinery and engineering; Residue; Chemical analysis; Fuel systems; Impurities; Liquefied petroleum gas; Olefins; Sulfur; Fuel supply system; LPG residue; LPG vehicle; Power machinery and engineering; Automotive fuels