关键词: 柴油, 乙烯-醋酸乙烯酯, 感受性, 降凝剂

Abstract: Four pour point depressants (A, B, C, D), home and abroad, were purified and found that their main components were all ethylene vinyl acetate copolymer (EVA) by GC-MS analysis. The sensitivities of various diesel components and blended diesel fuels to EVA type depressants were investigated. Test results showed that EVA type depressants could significantly reduced the pour point and cold filter plugging point (CFPP) of diesel fuel; at a depressant added dosage of 500 µg/g, the CFPP of hydrogenated diesel component dropped 12℃ with depressant B and the CFPP of – 20# diesel fuel dropped 20℃ with depressant C. The analysis results of n-paraffin content and carbon number distributions showed that diesel fuel having low n-paraffin content and its carbon number distributions mostly concentrated at low carbon number possessed good cold flow properties; diesel fuel with low n-paraffin content and wide carbon number distributions containing a small amount of high carbon number n-paraffins exhibited good sensitivity to pour point depressant.

Key words: diesel oil, ethylene vinyl acetate copolymer (EVA), susceptibility, pour point depressant