Selecting pour depressants for diesel fuels

Han, Sheng; Zeng, Kui; Lin, Hualin; Wang, Peng

doi:10.1007/s10553-010-0228-1

Cited by 2 publications

(1 citation statement)

References 8 publications

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“…By considering a large number of additives having different composition and structure, Han et al have found that the most effective additive is one that contains significant amount of aromatic compounds, which provide good solubility and dispersion of the additive and thus increase its efficiency in improving low-temperature properties [33].…”

Section: Introductionmentioning

confidence: 99%

Studying the impact of different additives on the properties of straight-run diesel fuels with various hydrocarbon compositions

Kirgina

Bogdanov

Altynov

et al. 2021

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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One of the most widely used way to improve low-temperature properties of diesel fuels is the use of additives. However, a variety of additives and the effect of susceptibility make it difficult to select additive for a particular composition of diesel fuel and operating conditions. The laws of interaction between functional groups of additives and hydrocarbons of the diesel fraction have not been investigated yet. The article discusses the influence of fractional, group and structural-group composition of straight-run diesel fuels on the effectiveness of cold flow improvers. The effect of additives concentration on the effectiveness of their action is considered. It was shown that when selecting a cold flow improver for diesel fuel and determining its optimal concentration, it is necessary to take into account the optimal content of various groups of hydrocarbons in diesel fuel, at which a cold flow improver is most effective.

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Section: Introductionmentioning

confidence: 99%

Studying the impact of different additives on the properties of straight-run diesel fuels with various hydrocarbon compositions

Kirgina

Bogdanov

Altynov

et al. 2021

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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How polymer additives reduce the pour point of hydrocarbon solvents containing wax crystals

Binks

Fletcher

Roberts

et al. 2015

Phys. Chem. Chem. Phys.

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We have investigated how four different pour point depressant (PPD) polymers affect the pour point transition in mixtures of a single pure wax in a solvent. We used either n-eicosane (C20), CH3(CH2)18CH3, n-tetracosane (C24), CH3(CH2)22CH3 or n-hexatriacontane (C36), CH3(CH2)34CH3 as the wax component with either n-heptane or toluene as the solvent component. For all wax-solvent combinations, the measured variation of wax solubility with temperature is well predicted by ideal solution theory. The variation of pour point temperature as a function of the overall wax concentration is quantitatively modelled using the idea that, for each overall wax concentration, the pour point occurs at a temperature at which a critical volume fraction ϕ* of wax crystals has precipitated. Close to the pour point temperature, extraction and examination of the wax crystals show they consist of polydisperse, irregularly-shaped platelets with axial ratios (h/d, where h is the plate thickness and d is the plate long dimension) in the range 0.005-0.05. It is found that the measured ϕ* values corresponding to the pour point transitions are weakly correlated with the wax crystal axial ratios (h/d) for all wax-solvent-PPD polymer combinations. These results indicate that the pour point transition occurs at a volume fraction larger than the value at which the volumes of rotation of the platelet crystals overlap, i.e., 2.5(h/d) < ϕ* < 11(h/d). PPD polymers work, in part, by increasing the wax crystal axial ratio (h/d), thereby increasing ϕ* and reducing the pour point temperature. Since the PPD's ability to modify the wax crystal shape relies on its adsorption to the crystal-solution surface, it is anticipated and observed experimentally that optimum PPD efficacy is correlated with the difference between the wax and the polymer solubility boundary temperatures. This finding and the mechanistic insight gained here provide the basis for a simple and rapid screening test to identify candidate species likely to be effective PPDs for particular wax systems.

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Selecting pour depressants for diesel fuels

Cited by 2 publications

References 8 publications

Studying the impact of different additives on the properties of straight-run diesel fuels with various hydrocarbon compositions

Studying the impact of different additives on the properties of straight-run diesel fuels with various hydrocarbon compositions

How polymer additives reduce the pour point of hydrocarbon solvents containing wax crystals

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