| 用差示扫描量热法确定原油的含蜡量 |
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| 引用本文： | 李鸿英,黄启玉,张帆,张劲军.用差示扫描量热法确定原油的含蜡量[J].中国石油大学学报(自然科学版),2003,27(1). |
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| 作者姓名： | 李鸿英 黄启玉 张帆 张劲军 |
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| 作者单位： | 石油大学石油天然气工程学院,北京102249 |
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| 基金项目： | 中国石油天然气集团公司中青年创新基金项目 ( 1999-30 ) |
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| 摘 要： | 应用DSC热分析技术得到了原油析蜡过程的热谱图 ,测定出了原油的析蜡点、析蜡高峰点、析蜡热焓等特性参数。给出了根据DSC实验结果计算原油含蜡量和一定温度区间内原油析蜡量的方法。分别对大庆、中原、胜利油田的原油进行了DSC热分析实验 ,根据其DSC热谱图计算了 3种原油的含蜡量以及不同温度区间内的原油析蜡量。其计算结果与采用RIPP 90方法 (氧化铝吸附法 )的测量结果对比表明 ,二者吻合较好 ,从而验证了DSC方法的可靠性。计算原油含蜡量方法的关键是选取DSC热谱图基线及确定蜡的平均结晶热。蜡的平均结晶热与原油中蜡的分子结构、碳数值等因素有关。胜利原油蜡的平均结晶热取 2 15J/g ;对未知分子结构的原油 ,建议蜡的平均结晶热取为 2 10J/g。
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| 关 键 词： | 原油 含蜡量 热分析法 差示扫描量热法 |
Determination of wax content in crude oil using differential scanning calorimetry |
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| LI Hong-ying,HUANG Qi-yu,ZHANG Fan,et al..Determination of wax content in crude oil using differential scanning calorimetry[J].Journal of China University of Petroleum,2003,27(1). |
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| Authors: | LI Hong-ying HUANG Qi-yu ZHANG Fan |
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| Institution: | LI Hong-ying,HUANG Qi-yu,ZHANG Fan,et al. College of Petroleum Engineering in the University of Petroleum,China,Beijing 102249 |
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| Abstract: | Differential scanning calorimetry (DSC) is a valuable technique to obtain a thermal fingerprint for crude oils. The wax content and the amount of wax precipitation in a range of certain temperature can be determined with the thermal fingerprint of crude oil. The calculation procedure and its graphical version are presented. The key for calculating wax content in crude is to select a proper baseline of DSC spectrum and the enthalpy of wax precipitation that is related to the wax composition and distribution. It is recommended that a constant thermal value of wax precipitation for crude oils with unknown molecular structure should be 210 Jg. |
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| Keywords: | crude oil wax content thermal analysis differential scanning calorimetry |
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