柴油对乙烯-醋酸乙烯酯降凝剂感受性的研究

用色-质联用方法对经纯化处理的4种国内外柴油降凝剂进行分析，确定了它们纯化后所得聚合物均为乙烯-醋酸乙烯酯。对柴油组分及其调合柴油进行降凝剂感受性试验，结果表明，乙烯-醋酸乙烯酯降凝剂对柴油具有较好的降凝效果，对加氢柴油及其调合柴油具有较好的降低冷滤点效果，当加剂量为500 ?g/g时，加入降凝剂B能使加氢柴油的冷滤点降低12 ℃，加入降凝剂C可使-20号调合柴油的冷滤点降低20 ℃。分析柴油的正构烷烃含量及其碳数分布，结果表明，正构烷烃含量低且具有较高含量低碳数正构烷烃柴油的低温性质较好；正构烷烃含量低、碳数分布宽、含有少量高碳数正构烷烃的柴油的加剂感受性较好。

RESEARCH ON THE DIESEL FUEL SENSITIVITY TO EVA POUR POINT DEPRESSANT

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.