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Analysis of paraffin precipitation from petroleum mixtures by means of DSC: Iterative procedure considering solid-liquid equilibrium equations

机译：用DSC分析石油混合物中石蜡的沉淀：考虑固液平衡方程的迭代程序

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摘要

Wax deposition is a well known flow assurance risk in crude oil production due to temperature decrease which depends mainly on the crude oil nature and the type and content of paraffin. The prevention of this problem requires a detailed characterization of the crude oil and the availability of reliable predictive models.rnThe experimental determination and quantification of the precipitation process is quite complex and time consuming and simpler techniques are of interest to carry out such study. Among them, differential scanning calorimetry (DSC) technique is appropriate to develop routine essays and has been extensively applied to determine wax appearance temperature in crude oil and fractions because the simplicity and fast response of the technique.rnHowever, the determination of wax precipitation curve from a quantitative DSC interpretation is usually based on pure n-alkane properties and involves some difficulties. In this work, a new procedure has been developed including the effect of the fluid composition on the precipitation temperature and the melting heat. Solid-liquid equilibrium equations were introduced through a simplified thermodynamic model in the integration procedure resulting in an iterative method combining experimental and calculated values. The final method yields the wax appearance temperature (WAT), the full wax precipitation curve and the estimated wax composition.rnIn order to validate the procedure, several crude oil fractions were used as standards due to the advantage of a narrow n-alkane distribution. Experimental characterization for the cloud point temperature, the n-alkane distribution (determined by gas chromatography with mass detector, GCMS) and DSC was carried out. The agreement between experimental results and those obtained from the DSC interpretation is a good check for the proposed procedure.
机译：由于温度降低，蜡沉积是原油生产中众所周知的流动保证风险，温度降低主要取决于原油的性质以及石蜡的类型和含量。要防止此问题，需要对原油进行详细的表征，并需要可靠的预测模型。沉淀过程的实验确定和定量是相当复杂的，并且需要耗时且简单的技术来进行此类研究。其中，差示扫描量热法（DSC）技术适合于开发常规论文，并且由于该技术的简便性和快速响应性，已被广泛用于确定原油和馏分中蜡的出现温度。定量DSC解释通常基于纯正烷烃性质，并且涉及一些困难。在这项工作中，开发了一种新的程序，包括流体成分对沉淀温度和熔化热的影响。通过简化的热力学模型，在积分过程中引入了固液平衡方程，得到了一种将实验值和计算值相结合的迭代方法。最后一种方法可以得出蜡的出现温度（WAT），完整的蜡沉淀曲线和估计的蜡组成。为了验证该程序，由于正构烷烃分布窄，使用了几种原油馏分作为标准液。进行了浊点温度，正构烷烃分布（由气相色谱仪，质量检测器，GCMS确定）和DSC的实验表征。实验结果与从DSC解释中获得的结果之间的一致性是对所建议程序的良好检验。

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  • 来源
    《Fuel》 |2010年第5期|p.1087-1094|共8页
  • 作者

    Baudilio Coto; Carmen Martos; Juan J. Espada; Maria D. Robustillo; Jose L. Pena;

  • 作者单位

    Department of Chemical and Energy Technology, ESCET, Universidad Reyjuan Carlos, c/ Tulipan s, 28933 Mostoles (Madrid), Spain;

    Department of Chemical and Energy Technology, ESCET, Universidad Reyjuan Carlos, c/ Tulipan s, 28933 Mostoles (Madrid), Spain;

    Department of Chemical and Energy Technology, ESCET, Universidad Reyjuan Carlos, c/ Tulipan s, 28933 Mostoles (Madrid), Spain;

    Department of Chemical and Energy Technology, ESCET, Universidad Reyjuan Carlos, c/ Tulipan s, 28933 Mostoles (Madrid), Spain;

    Department of Chemical and Energy Technology, ESCET, Universidad Reyjuan Carlos, c/ Tulipan s, 28933 Mostoles (Madrid), Spain Repsol Technology Centre, 28933 Mostoles (Madrid), Spain;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    wax precipitation; DSC thermal analysis; solid-liquid equilibrium; flow assurance;

    机译：蜡沉淀DSC热分析;固液平衡流量保证;

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