文献类型：期刊文献

中文题名：柴油对流动改进剂感受性差异的原因表征与分析

英文题名：Characterization and analysis for causes of difference of susceptibility of flow improver in diesel

作者：吕涯[1];袁小军[1];翁惠新[1]

机构：[1]华东理工大学石油加工研究所,上海200237

年份：2005

卷号：33

期号：3

起止页码：367

中文期刊名：燃料化学学报

外文期刊名：Journal of Fuel Chemistry and Technology

收录：CSTPCD;;EI(收录号：2005299226078);Scopus;北大核心:【北大核心2004】；CSCD:【CSCD2011_2012】；

语种：中文

中文关键词：柴油;正构烷烃;流动改进剂;正态分布

外文关键词：diesel fuel; n- paraffin; flow improver; normal distribution

摘要：The improvement of the Cold Filter Plugging Point (CFPP) by an additive will depend on either the characteristics of the diesel or the additive itself. The ways in which cold flow improver interacts with the constituents of the fuels and the reasons for their efficiencies are far from fully elucidated. In this work , the contents of the n-paraffin in five kinds of diesels were tested by urea adduction, and the carbon distribution of n-paraffins was tested by temperature programmed gas chromatograph GC-14A and computed by the software for simulating distillation. Maximum likelihood method is applied to obtain μ and σ2 of the carbon distribution, and the deviation χ2 is computed. When the degrees of freedom is 4 and significance level (α) is 0.10, χ2_ 0.90(4)=7.779. If deviation χ2 is smaller than χ2_ 0.90(4), the hypothesis that the population is normal is accepted. The results show that the distributions of n-paraffin in these five kinds of diesels are normal. It can be found that the susceptibility of the diesel DQCH is weak and the variance σ2 of the carbon distribution in n-paraffin is only 1076.21 smaller than that for other diesels. The smaller the variance σ2 is, the weaker the susceptibility is. The susceptibility of the diesel LYL is also weak. The value of the statistic test quantity χ2 on the normal distribution of the n-paraffin in the diesel LYL is 4.112 bigger than other diesels . Statistic test quantity χ2 could reflect whether the carbon distribution of n-paraffin fits the normal distribution. When the carbon distribution of n-paraffin does not fit normal well, the wax settling does not match the agglomeration of flow improver. In this situation, the flow improver can’t interact with more wax crystal so that the CFPP of diesel can not be decreased.
The improvement of the Cold Filter Plugging Point (CFPP) by an additive will depend on either the characteristics of the diesel or the additive itself. The ways in which cold flow improver interacts with the constituents of the fuels and the reasons for their efficiencies are far from fully elucidated. In this work, the contents of the n-paraffin in five kinds of diesels were tested by urea adduction, and the carbon distribution of n-paraffins was tested by temperature programmed gas chromatograph GC-14A and computed by the software for simulating distillation. Maximum likelihood method is applied to obtain μ and σ2 of the carbon distribution, and the deviation χ2 is computed. When the degrees of freedom is 4 and significance level (α) is 0.10, χ0.902 (4) = 7.779. If deviation χ2 is smaller than χ0.902 (4), the hypothesis that the population is normal is accepted. The results show that the distributions of n-paraffin in these five kinds of diesels are normal. It can be found that the susceptibility of the diesel DQCH is weak and the variance σ2 of the carbon distribution in n-paraffin is only 1076.21 smaller than that for other diesels. The smaller the variance σ2 is, the weaker the susceptibility is. The susceptibility of the diesel LYL is also weak. The value of the statistic test quantity χ2 on the normal distribution of the n-paraffin in the diesel LYL is 4.112 bigger than other diesels. Statistic test quantity χ2 could reflect whether the carbon distribution of n-paraffin fits the normal distribution. When the carbon distribution of n-paraffin does not fit normal well, the wax settling does not match the agglomeration of flow improver. In this situation, the flow improver cant interact with more wax crystal so that the CFPP of diesel can not be decreased.