UNIQUAC model for wax solution with pour point depressant

Chen, W.H.; Zhang, X.D.; Zhang, Zhao; Yin, Caoyong

doi:10.1016/j.fluid.2009.03.003

Cited by 28 publications

(14 citation statements)

References 24 publications

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“…To verify the performance of the proposed model for calculating wax precipitation from crude oil, numerical simulation runs were conducted for experiments performed in this work and given in the literature (Pauly et al 2004;Pedersen et al 1991;Chen et al 2009). In this work, solutions (Tables 6, 10) (Chen et al 2009) and mixtures 1-5 (Fig.…”

Section: Model Validationmentioning

confidence: 99%

“…In this work, solutions (Tables 6, 10) (Chen et al 2009) and mixtures 1-5 (Fig. 5) (Pauly et al 2004) were used to verify the performance of the proposed model for calculating wax precipitation from crude oil.…”

Section: Model Validationmentioning

confidence: 99%

“…In order to predict the wax precipitation conditions, a reliable thermodynamic model is necessary. Several thermodynamic models for estimation of wax precipitation have been reported in the literature (Barker and Henderson 1969;Chen et al 2009). A literature review (Dalirsefat and Feyzi 2007) indicates that the models for wax precipitation have been developed by two different approaches.…”

Section: Introductionmentioning

confidence: 99%

“…These models are based on solid solution (SS) theory which assumes that all the components in the solid phase are miscible in all proportions (Won 1968(Won , 1989Hansen et al 1988;Pedersen et al 1991;Zuo et al 2001;Ji et al 2004). Chen et al (2009) proposed new correlations for the melting points and solidsolid transition temperatures of treated paraffin based on the experimental results from differential scanning calorimetry (DSC). They first estimated the required thermodynamic properties of pure n-paraffin and then a new approach based on the UNIQUAC equation was described.…”

Section: Introductionmentioning

confidence: 99%

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Experimental study and a proposed new approach for thermodynamic modeling of wax precipitation in crude oil using a PC-SAFT model

Behbahani¹

2016

Pet. Sci.

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A powerful method is necessary for thermodynamic modeling of wax phase behavior in crude oils, such as the perturbed-chain statistical associating fluid theory (PC-SAFT). In this work, a new approach based on the wax appearance temperature of crude oil was proposed to estimate PC-SAFT parameters in thermodynamic modeling of wax precipitation from crude oil. The proposed approach was verified using experimental data obtained in this work and also with those reported in the literature. In order to compare the performance of the PC-SAFT model with previous models, the wax precipitation experimental data were correlated using previous models such as the solid solution model and multi-solid phase model. The results showed that the PC-SAFT model can correlate more accurately the wax precipitation experimental data of crude oil than the previous models, with an absolute average deviation less than 0.4 %. Also, a series of dynamic experiments were carried out to determine the rheological behavior of waxy crude oil in the absence and presence of a flow improver such as ethylene-vinyl acetate copolymer. It was found that the apparent viscosity of waxy crude oil decreased with increasing shear rate. Also, the results showed that the performance of flow improver was dependent on its molecular weight.

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Section: Model Validationmentioning

confidence: 99%

Section: Model Validationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experimental study and a proposed new approach for thermodynamic modeling of wax precipitation in crude oil using a PC-SAFT model

Behbahani¹

2016

Pet. Sci.

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“…They basically contain polymers [6][7][8][9][10][11][12][13][14] such as copolymers of ethylene and vinyl acetate, polyalkyl methacrylate, maleic anhydride, alkylnaphthalenes, nitrogen-containing, and other polymers. These compounds are usually soluble in crude oil and have very complex compositions [15,16].…”

mentioning

confidence: 99%

Selecting pour depressants for diesel fuels

Han

Zeng

Lin

et al. 2010

Chem Technol Fuels Oils

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The correlation between effectiveness and composition was investigated to choose the most effective pour depressant from the multitude on the market. Samples of pour depressants from the main manufacturers were collected and their ability to improve the low-temperature properties of diesel fuels was evaluated. The composition and structure of the additives with the best results and their solvents after separation by crystallization were investigated by Fourier-transform infrared spectroscopy, proton nuclear magnetic resonance spectroscopy, and chromatography-mass spectrometry. It was shown that copolymers of ethylene and vinyl acetate are the most effective pour depressant additives. Their solvents contain aromatic compounds.The pour depressants added to diesel fuel to improve its low-temperature properties modify crystallization of waxes [1][2][3][4][5]. They basically contain polymers [6][7][8][9][10][11][12][13][14] such as copolymers of ethylene and vinyl acetate, polyalkyl methacrylate, maleic anhydride, alkylnaphthalenes, nitrogen-containing, and other polymers. These compounds are usually soluble in crude oil and have very complex compositions [15,16]. Diesel fuel, with additive Decrease, deg LFT t s A-1

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Reaction of pore depressants and solvents

Han

Zeng

Shen

et al. 2011

Chem Technol Fuels Oils

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Use of pour depressants is the most effective and economical method of improving the low-temperature properties of diesel fuels. The reaction of T1804D pour depressant with different solvents was investigated by differential scanning calorimetry. It was shown that they affect the decrease in the limiting filterability temperature and the solid point of diesel fuel to a different degree. The effectiveness of the pour depressant increased when it was mixed with aromatic solvents that ensure dissolution and dispersion of wax crystals in diesel fuel at low temperatures.

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UNIQUAC model for wax solution with pour point depressant

Cited by 28 publications

References 24 publications

Experimental study and a proposed new approach for thermodynamic modeling of wax precipitation in crude oil using a PC-SAFT model

Experimental study and a proposed new approach for thermodynamic modeling of wax precipitation in crude oil using a PC-SAFT model

Selecting pour depressants for diesel fuels

Reaction of pore depressants and solvents

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