Thermal decomposition of Tatarstan Ashal’cha heavy crude oil and its SARA fractions

Varfolomeev, Mikhail A.; Galukhin, Andrey; Нургалиев, Д. К.; Kök, Mustafa Verşan

doi:10.1016/j.fuel.2016.08.042

Cited by 121 publications

(48 citation statements)

References 12 publications

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“…Petroleum is characterized in terms of the contents of the fractions denominated by saturated, aromatic, resins, and asphaltenes (SARA). These fractions are separated from petroleum based on their polarity, using solvents with different polarities and the adsorption on active surfaces, such as silica (Varfolomeev et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Factors That Affect Crude Oil Viscosity and Techniques to Reduce It: A Review

Santos

Oliveira

Mansur

2017

BJPG

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During oil extraction, the high viscosity of crude oil cause major problems, affecting negatively the oil production rate. Many studies have focused on evaluating the properties of different crude oil grades and their production techniques. The main causes of high viscosity are the presence of solids and high concentrations of heavy fractions and the formation of water-in-oil (W/O) emulsions. This paper discusses the mechanisms that seek to reduce the viscosity of oil containing high concentrations of heavy fractions, the mechanisms of formation and destabilization of emulsions, and the use of polymers in technologies to reduce viscosity, mainly by applying emulsion viscosity reducers (EVRs).

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Section: Introductionmentioning

confidence: 99%

Factors That Affect Crude Oil Viscosity and Techniques to Reduce It: A Review

Santos

Oliveira

Mansur

2017

BJPG

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“…This is because asphaltenes have a macromolecular structure with structural stability in SARA fractions. 41 The release amount of small molecular and macromolecular volatiles increases simultaneously when the heating rate is increased. In conclusion, released gaseous products from asphaltenes mainly include H 2 O, CO 2, SO, SO 2 , disulfides, propane, naphthalene, acetaldehyde, methyl mercaptan, acetonitrile, etc.…”

Section: Resultsmentioning

confidence: 99%

Thermal Characteristics, Kinetic Models, and Volatile Constituents during the Energy Conversion of Bituminous SARA Fractions in Air

Xia

2020

ACS Omega

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To understand the thermal characteristics, nonisothermal kinetic models, and volatile constituents during the energy conversion of bituminous materials at the fraction level, differential scanning calorimetry–mass spectrometry tests were performed on bituminous four fractions, including saturates, aromatics, resins, and asphaltenes (SARA). Then, three-dimensional (3D) nonisothermal kinetic models of SARA fractions were established and volatile constituents of SARA fractions were discussed. Results indicate that when the heating rate is increased, the decomposition temperature ranges in each stage increase and the initial decomposition, peak, and burn-out temperatures of each SARA fraction all shift to high temperatures. Also, the whole energy conversion processes of SARA fractions are mainly exothermic reactions. Additionally, the energy conversion mechanism in each stage of saturates and aromatics accords with different nonisothermal kinetic models. However, the energy conversion mechanisms of resins and asphaltenes are similar and both accord with the 3D diffusion models. Further, the established nonisothermal kinetic models in each decomposition stage of SARA fractions are feasible to describe the energy conversion processes of SARA fractions. The released small molecular volatiles from saturates and aromatics increase when the heating rate is increased, but the macromolecular volatiles are decreased. The opposite is true for resins, but all volatiles emitted from asphaltenes are increased. Finally, the heating rate has little influence on the constituents of emitted gaseous products from SARA fractions but shows an effect on the release amount of volatiles from SARA fractions. The main common volatiles of SARA fractions are CO 2 , H 2 O, methanol, hydrazine, propyne, acetaldehyde, and propane. This study contributes to further reveal the energy conversion mechanisms of bituminous materials.

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“…For such a purpose, a kinetic study has been conducted through a simultaneous thermal analysis system -TGA (thermogravimetry analysis) and DTA (differential thermal analysis) by following the methodology of non-isothermal tests. Thermogravimetric tests were performed and fuel activation energies for gasoline, ethanol, and percentages of 5,10,15,20,25,30,50, and 75% (%v) ethanol mixed with gasoline, which was achieved by the model free kinetics. The analysis results suggest that the theoretical curves characteristics of the thermal decomposition of ethanol-gasoline blends are rather different due to their ethanol content.…”

Section: Synergy Interaction Thermal Analysis Free Kinetics Ethanol Amentioning

confidence: 99%

“…The TGA techinique allows investigating the kinetics of thermal decomposition during the combustion of both solid [19,[24][25][26] or liquid fuels [27][28][29][30]. The kinetics method applied in this study was based on isoconversional techniques and the activation energy was obtained as a function of the conversion level of a chemical reaction.…”

Section: Kinetic Modelmentioning

confidence: 99%