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A simplified thermodynamic modeling procedure for predicting asphaltene precipitation

机译：预测沥青质沉淀的简化热力学建模程序

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摘要

In this work, a simplified thermodynamic modeling procedure for determination of the amount of asphaltene precipitation is presented. The onset of asphaltene precipitation in the presence of different solvents is predicted by applying the molecular solubility model. Since asphaltene molecular weight varies in different solvents, the molecular weight of asphaltene has been tuned by experimental data. The tuned molecular weight is used to predict the amount of precipitated asphaltene. The Flory-Huggins statistical thermodynamics theory is applied to derive the Gibbs free energy relationship. A necessary and sufficient condition is defined to minimize the Gibbs free energy relation. By solving the set of equations derived from the minimization, the weight percent of precipitated asphaltene has been determined. The advantage of this model is that one does not need to perform expensive and time consuming experiment in order to obtain molecular weight data. The other improvement of this model compared to the other models is the requirement of a minimum amount of experimental data to find the unknown parameters. It also has the advantage of obtaining solubility parameters through thermodynamics relationships rather than using the relation for regular solution when the asphaltene solution is a non-regular solution. The results of this model are in good agreement with the experimental data.
机译：在这项工作中，提出了确定沥青质沉淀量的简化热力学建模程序。通过应用分子溶解度模型可以预测在不同溶剂存在下沥青烯沉淀的开始。由于沥青质的分子量在不同的溶剂中会发生变化，因此沥青质的分子量已通过实验数据进行了调整。调节的分子量用于预测沉淀的沥青质的量。应用弗洛里-哈金斯统计热力学理论推导了吉布斯自由能关系。定义了一个必要和充分的条件以最小化吉布斯自由能关系。通过求解从最小化得出的一组方程，已确定了沉淀的沥青质的重量百分比。该模型的优势在于，无需执行昂贵且耗时的实验即可获得分子量数据。与其他模型相比，此模型的另一个改进是需要最少数量的实验数据才能找到未知参数。当沥青质溶液是非规则溶液时，它还具有通过热力学关系而不是使用规则溶液的溶解度参数的优点。该模型的结果与实验数据吻合良好。

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