«Proceedings of Gubkin University»

Influence of hydrocarbon composition on low-temperature properties of diesel fuels with presence of pour point depressant

UDC: 665.753.4
DOI: 10.33285/2073-9028-2022-3(308)-169-182

Authors:

¹ Tomsk Polytechnic University, Tomsk, Russian Federation

Keywords: diesel fuel, hydrocarbon composition, molecular weight distribution of n-paraffins, low-temperature properties, pour point depressant

Annotation:

The article investigates the molecular weight distribution of n-paraffins and the hydrocarbon composition of various samples of diesel fuels. An analysis of the relationship between low-temperature properties and the studied characteristics was carried out to assess the effect of the molecular weight distribution of n-paraffins and hydrocarbon composition on the cloud point, filterability, and pour points with the presence of a pour point depressant and without it. Experimental confirmation of the established regularities was obtained. Based on the results obtained, it was concluded that the pour point of pure diesel fuels depends on the ratio of the concentrations of short-chain and long-chain n-paraffins. Thus, the sample with the highest ratio of short-chain to long-chain paraffins (0,976) has the highest pour point (–13,2 °C) and the widest fractional composition (147 °С), while the sample with the lowest ratio of short-chain to long-chain paraffins (0,316) has the lowest pour point (–34,3 °C) and the narrowest fractional composition (67 °С). It was established that the best injectivity to depressant additives is observed in samples with a wide fractional composition, i.e. for fuels with a large difference between the boiling points of 90 and 10 % fractions. Such fuels contain a large amount of both light and heavy paraffins, which are involved in the process of co-crystallization with a pour point depressant. The results of the study of the influence of the hydrocarbon composition on the low-temperature properties of diesel fuels showed that with an increase in the total content of paraffins (C12–C17) the injectivity of diesel fuel to a pour point depressant improves.

Bibliography:

1. Golubeva I.A., Krjuchkov M.V. Neftegazohimija v Rossii: sostojanie, problemy, perspektivy razvitija//Himija i tehnologija topliv i masel. – 2021. – № 1 (623). – S. 49–56.
2. Speight J.G. Chemistry and Technology of Petroleum. – Fifth edition. – London: Taylor Francis Group, LLC, 2014. – 206 р.
3. Neftepererabotka Rossii: kurs na modernizaciju//Moskovskij neftegazovyj centr Ernst Young. – M.: Jernst jend Jang (SNG) B.V., 2014. – 28 s.
4. Analiticheskij bjulleten’//Neftegazodobyvajushhaja i neftepererabatyvajushhaja promyshlennost’: tendencii i prognozy. – 2013 [Jelektronnyj resurs]. – Rezhim dostupa: http://vid1.rian.ru/ig/ ratings/oil_gas_demo 44.pdf (data obrashhenija: 20.03.2022).
5. Mannapov I.V., Spashhenko A.Ju. Modifikacija svojstv dizel’nyh topliv prisadkami razlichnogo funkcional’nogo naznachenija//Jelektronnyj nauchnyj zhurnal “Neftegazovoe delo”. – Rezhim dostupa: http://ogbus.ru/files/ogbus/issues/3_2014/ogbus_3_2014_p168–186_MannapovIV_ru.pdf (data obrashhenija: 20.03.2022).
6. Klement’ev V.N, Levin V.O. Tendencii//Izvestija SPbGTI (TU). – 2015. – № 29. – S. 36–39.
7. Burov E.A., Ivanova L.V., Koshelev V.N. Ocenka jeffektivnosti dejstvija funkcional’nyh prisadok v zimnih dizel’nyh toplivah razlichnogo gruppovogo uglevodorodnogo sostava//Himija i tehnologija topliv i masel. – 2021. – № 1 (623). – S. 11–16.
8. Danilov A.M. Novyj vzgljad na prisadki k toplivam (Obzor)//Neftehimija. – 2020. – Vol. 60, № 2. – S. 163–171.
9. Vafaev O.Sh., Tadzhihodzhaev Z.A., Dzhalilov A.T. Vlijanie depressornyh prisadok na snizhenie temperatury zastyvanija dizel'nyh topliv//Innovacionnye materialy i tehnologii: materialy dokladov Mezhdunarodnoj nauchno-tehnicheskoj konferencii molodyh uchenyh, Minsk, 9–11 janvarja 2019 g. – Minsk, 2019. – S. 218–221.
10. Kondrasheva N.K., Kondrashev D.O., Rudko V.A. Uluchshenie nizkotemperaturnyh svojstv dizel’nyh i sudovyh topliv pri pomoshhi depressornyh prisadok//Akademicheskij zhurnal Zapadnoj Sibiri. – 2014. – Vol. 10, № 2 (51). – 41 s.
11. Shevchenko A.P., Sejfetdinov D.R. Ocenka sposobov regulirovanija nizkotemperaturnyh svojstv dizel’nyh topliv//Tehnologii nefti i gaza. – 2018. – № 3. – S. 16–23.
12. Identification of hydrocarbon compositions of diesel fractions and assessment of their effect on fuel operational characteristics/E.V. Frantsina, A.A. Grinko, N.I. Krivtsova, M.V. Maylin, A.A. Sycheva//Petroleum Science and Technology. – 2020. – Vol. 38. – No. 4. – P. 338–344.
13. Uluchshenie nizkotemperaturnyh svojstv dizel’nyh topliv: Monografija/S.G. Agaev, A.M. Glazunov, S.V. Gul’tjaev, N.S. Jakovlev. – Tjumen’: TjumGNGU, 2009. – 145 s.