IMPROVEMENT OF THERMAL OXIDATIVE CHARACTERISTICS OF DIESEL FUELS WITH ESTERS OF CYCLIC POLYATOMIC ALCOHOLS

Azerbaijan Chemical Journal ◽

10.32737/0005-2531-2020-4-37-42 ◽

2020 ◽

pp. 37-42

Author(s):

L.M. Yusifova ◽

Keyword(s):

Oxidative Stability ◽

Pour Point ◽

Flash Point ◽

Thermal Oxidative Stability ◽

Diesel Fuels ◽

Polyatomic Alcohols ◽

Hydrotreated Diesel

A number of symmetric, asymmetric and complex esters of 2,2,5,5-tetramethylolcyclopentanol and 2,2,6,6-tetramethylolcyclohexanol were synthesized, their physicochemical, viscosity-temperature and thermo-oxidative properties were studied. With the addition of these esters to hydrotreated diesel fuels 0.004% it was possible to significantly improve the operational properties of fuels: to increase thermal oxidative stability, flash point and lower pour point. Proceeding from these results, the esters of cyclic polyatomic alcohols are recommended as complex additives to diesel fuels

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Development and study of new oil compositions on industrial dioktylcebacylic oils adding esters of 2.5,5.5-tetrametylolcyclopethane

Azerbaijan Oil Industry ◽

10.37474/0365-8554/2021-2-39-43 ◽

2021 ◽

pp. 39-43

Author(s):

M.A. Mammadyarov ◽

◽

G.N. Gurbanov ◽

L.M. Yusifova ◽

G.Z. Hasanova ◽

...

Keyword(s):

Oxidative Stability ◽

Gas Turbine ◽

Viscosity Index ◽

Flash Point ◽

Turbine Engines ◽

Gas Turbine Engines ◽

Thermal Oxidative Stability ◽

The Future

Complex esters of 2.5,5.5-tetrametylolcyclopethane with heptanedioic and hexanoic acids, as well as methyl and 2-ethylhexyl alcohols have been synthesized and studied. Few compositions have been obtained adding these esters to the industrial ones of 5-20 % diisooktyl sebacylic. It was defined that exploitation characteristics of these compositions are significantly higher than those of DOS: viscosity index, flash point, thermal oxidative stability and lubricating characteristics. Based on these parameters, it is recommended to use in the future these compositions in the preparation of aircraft oils of gas-turbine engines instead of DOS esters.

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Lubrication properties of dodecanedioate esters-based bio-lubricant

Letters in Applied NanoBioScience ◽

10.33263/lianbs92.11171125 ◽

2020 ◽

Vol 9 (2) ◽

pp. 1117-1125

Keyword(s):

Friction Coefficient ◽

Oxidative Stability ◽

Pour Point ◽

Viscosity Index ◽

Carbon Chain ◽

Flash Point ◽

Carbon Chain Length ◽

Low Friction ◽

Chemical Structures ◽

Lubrication Properties

Interest in the synthesis of new bio-lubricants with improved lubricity properties and higher quality is increasing. This study aimed to evaluate the bio-lubrication properties of synthesized dodecanedioate esters-based bio-lubricant. Thirteen samples of dodecanedioate esters with different chemical structures were synthesized. The results showed that di-2-methylbutyl dodecanedioate (D2MBD), di-2-ethylbutyl dodecanedioate (D2EBD), and di-2-ethylhexyl dodecanedioate (D2EHD) showed good low-temperature properties with very low pour point (PP) values of -45 oC, -35 oC, and -55 oC, respectively. Di-oleyl dodecanedioate (DOlD) showed a remarkable flash point (FP) value of 300 oC; however, it showed poor oxidative stability (OXS) at 177 oC. The results showed increases in flash point (FP), viscosity index (VI), and oxidative stability (OXT) with increasing carbon chain length and branching in the employed alcohol. Furthermore, friction coefficient, Newtonian and non-Newtonian properties were tested. The results showed that the tested dodecanedioate esters, which have high molecular weight had a low friction coefficient, and they were classified as non-Newtonian fluids except DOLD was classified as a Newtonian fluid. In general, based on the results, the branched dodecanedioate esters can be used as lubricant without additives.

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Chemically modified Jatropha curcas oil for biolubricant applications

Hemijska industrija ◽

10.2298/hemind200809009n ◽

2021 ◽

pp. 9-9

Author(s):

Nurazira Nor ◽

Nadia Salih ◽

Jumat Salimon

Keyword(s):

Oleic Acid ◽

Oxidative Stability ◽

Jatropha Curcas ◽

Ring Opening ◽

Pour Point ◽

Viscosity Index ◽

Oxirane Oxygen ◽

Flash Point ◽

Performic Acid ◽

Jatropha Curcas Oil

Jatropha curcas oil is one of interesting renewable resources for preparation of biolubricants. However, direct application of this oil as a biolubricant is restricted due to its low oxidative stability. This drawback can be overcome by molecule structural redesign through a chemical modification process at its unsaturated functional groups. Jatropha curcas oil was modified via epoxidation, ring opening and esterification processes. Its conversion to the epoxidized oil was performed by using in situ performic acid as a catalyst, then reaction with oleic acid in the presence of p-toluenesulfonic acid as a catalyst in the ring opening process. The final esterification process with oleic acid was catalyzed by sulfuric acid. Molecular structures of the modified oil were determined by measurements of the oxirane oxygen content and by Fourier-transform infrared (FTIR), proton and carbon nuclear magnetic resonance (1H NMR and 13C NMR) spectroscopy analyses. The results showed that the oxidative stability, viscosity, flash point and pour point of the final product were significantly improved. In specific, the ring opening and esterification processes inducing branching and bending in the final oil molecular structure have resulted in the improved viscosity index of 135, the pour point of -29?C and the increased flash point of 250?C.

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