Characterization of petroleum products by DSC analysis

Giavarini, Carlo; Pochetti, F.

doi:10.1007/bf01914477

Cited by 72 publications

(21 citation statements)

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“…Giavarini and Pochetti [7] later observed two endotherms in paraffinic waxes, whereas they observed a single broad endotherm in microcrystalline (non-paraffinic) waxes. It is thus generally considered that endotherms in petroleum products arise from paraffins, or alkanes.…”

Section: Introductionmentioning

confidence: 99%

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Melting and glass transitions in paraffinic and naphthenic oils

et al. 2006

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/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://dx.doi.org/10.1016/j.tca. 2005.11.001 Thermochimica Acta, 440, 2, pp. 132-140, 2006-01-15 Melting and glass transitions in paraffinic and naphthenic oils Masson, J-F.; Polomark, G. M.; Bundalo-Perc, S.; Collins, P. AbstractNaphthenic and paraffinic oils were analyzed by modulated differential scanning calorimetry (MDSC). The results showed several improvements in the analysis of thermal properties when compared with standard DSC. The glass transition temperature (T g ), the enthalpy relaxation at T g , and the melting endotherms could be deconvoluted, and reversible melting could be identified. This allowed for an easier interpretation of the thermal properties of the oils. With MDSC, the T g s in mineral oils were found to coincide with endothermic enthalpy relaxation, which is generally regarded as a melting endotherm with standard DSC. A decrease in heat capacity after T g was attributed to the existence of rigid amorphous material. From Δc p at T g and the oil molecular weight, the number of repeat units in the oil chains was estimated at less than 20. The T g of a hypothetical pure aromatic oil was found to be similar to that for petroleum asphaltenes, and that for a naphthenic oil of infinite molecular weight to be similar to that of petroleum resins.

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Section: Introductionmentioning

confidence: 99%

“…DSC was used to study the glass transition temperature (T g ) and crystallization in bitumen [4,5], oils [6] and waxes [7]. Noel and Corbett [5] first established that the T g of bitumen depended on its source and that "waxy" and "nonwaxy" bitumens could be distinguished based on the DSC profiles.…”

Section: Introductionmentioning

confidence: 99%

Melting and glass transitions in paraffinic and naphthenic oils

et al. 2006

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“…When a sample of oil was heated in air, the DSC apparatus recorded an exothermic effect resulting from the oxidative degradation of the oil. The onset temperature of the exotherm was taken as a measure of the thermal stability of the oil; the higher the onset temperature of the exothermic reaction, the more the oil is resistant towards oxidative degradation, and conversely [3,4].…”

Section: Thermal Degradation Under a Static Atmospherementioning

confidence: 99%

“…Recently, however, thermoanalytical techniques such as differential thermal analysis, differential scanning calorimetry, thermogravimetry and derivative thermogravimetry, which are instrumental methods wherein the sensing devices respond to temperature changes caused by energy changes within the material, have been used extensively as simple and quick methods for studying the thermal stabilities of petroleum-derived products such as lubricating oils, greases and bitumens [3][4][5].…”

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confidence: 99%

Study of thermal stabilities of some heat transfer oils

Al-Sammerrai¹

1985

Journal of Thermal Analysis

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This paper discusses the thermal behaviour and stabilities of some heat transfer fluids. These included four solvent-refined mineral oils, two aromatic extracts and two synthetic oils. Results of this thermoanalytical investigation, which simulated different atmospheric conditions, showed the synthetic oils to have higher thermal stabilities than those of the other oils.The refined mineral oils exhibited higher thermal stabilities than those of the aromatic extracts when studied under a static air atmosphere. This behaviour was reversed when the experiment was performed under a confined atmosphere of air.These observations are attributed mainly to the environmental changes and also to the compositions of these products.The transfer of heat in open and closed systems plays an important part in many manufacturing processes. Typical operations include petroleum refining, chemical synthesis, plywood lamination, plastic production, etc.Many organic heat transfer oils have been developed and exhibit good heat transfer at elevated temperatures, typically in the 150-300 ~ range. The most common and economical of these organic oils are the petroleum-derived hydrocarbon oils, although synthetic and chlorinated oils too are often used [1].A heat transfer fluid should be non-corrosive to metals, it should be liquid over a wide temperature range and in general it should have a low vapour pressure. Such a fluid should be applicable as a heat transfer medium over an extended period of time at a given temperature, and should exhibit a high thermal stability. Thus, a heat transfer fluid is often required to operate at temperatures of the order of 250 ~ or higher over long periods [1].

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“…Among the studies related to DSC, Flaherty characterized hydrocarbons and natural waxes [20]. Giavarini characterized the petroleum products [21]. DSC is the most used method for determining the storage capacity because it is one of the most common commercial devices.…”

Section: T-history Methods and Its Developmentmentioning

confidence: 99%

Thermal energy storage by phase change materials in power generation

Qin¹

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Thermal energy storage (TES) is seen as a feasible solution to the energy crisis in the 21 st century. This study focuses on the development of a TES unit with PCMs employed in a power cogeneration cycle. Firstly, the thermal analysis of some suitable PCMs were conducted through the differential scanning calorimetry (DSC) technique and the T-history method. Some disagreement was found between their measurement results and the possible reasons were discussed. Besides, it was found that eutectic salts or salts were suitable PCMs to be applied in the temperature range of 200~300 ºC. Secondly, one TES unit with paraffin wax as the PCM was constructed and tested in the laboratory. Three groups of the fan speeds and two groups of the heater power were set and the temperature of the PCM was observed in the two chambers B and D. It was found that at the lower fan speed and the higher heater power working conditions, the PCM would melt faster, and thus achieve a higher TES performance. Thirdly, the Two-D and Three-D time-dependent numerical simulations of the TES unit were conducted in COMSOL Multi-physics. The Three-D simulation counted in the natural convection inside the liquid PCM and was found closer to the experiments. The "sudden jump" of temperature at the end of the PCM melting was successfully simulated. Lastly, a TES unit final design was given and one design with selected parameters was built in COMSOL and numerically simulated. The effects of the gas and oil inlet mass flow rates were evaluated. It was found that the gas inlet mass flow rate has a higher influence on the PCM melting fraction in the steady working condition. In the future work, a more detailed numerical analysis will be done on the aspects of the melting time, the instantaneous heat transfer rate and the charging time needed based on a series of time dependent studies. The PCM conductivity enhancement ways such as adding fins will also be considered in the investigation. ii Acknowledgement During my master's degree study, many people have helped me in one way or another. I would like to express my sincere thanks to them. Firstly, I would like to thank my supervisor, Dr. Fei Duan, for his consistent guidance, instruction and encouragement. Without his help, my research and personal life would have much reduced quality. His passion about life and work affects me so deeply and his creative thoughts always inspire me with new research ideas.

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Characterization of petroleum products by DSC analysis

Cited by 72 publications

References 3 publications

Melting and glass transitions in paraffinic and naphthenic oils

Melting and glass transitions in paraffinic and naphthenic oils

Study of thermal stabilities of some heat transfer oils

Thermal energy storage by phase change materials in power generation

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