نتایج جستجو برای: asphaltenes

تعداد نتایج: 370  

Journal: :Catalysts 2023

Catalytic thermolysis is considered to be an effective process for viscosity reduction, the conversion of high-molecular components oil (resins and asphaltenes) into light hydrocarbons, desulfurization hydrocarbons. In this paper, we conducted non-catalytic catalytic a heavy sample isolated from Ashalcha field (Tatarstan, Russia) at temperature 250 °C. Fullerene C60 nanoparticles were applied p...

Journal: :Journal of the Fuel Society of Japan 1982

Journal: :Journal of the Fuel Society of Japan 1982

H. Müller Steinhagen Kaveh Ahmadi Mohammad Jamialahmadi Siavash Ashoori,

In this work, the precipitation and re-dissolution of asphaltenes were studied for an Iranian relatively heavy crude oil. A series of experiments were designed and carried out to quantitatively examine the reversibility of asphaltenes precipitation upon the change in the solvent concentration along with the temperature. n-Heptane was used as the precipitant, and a temperature range of 30 to...

Journal: :Coatings 2022

This paper proposes a simple scheme to separate asphaltenes from asphalt at room temperature without heating or refluxing. The proposed can solve the problems of high energy cost, expensive devices, and safety risks flammable steam in standard methods asphaltene extraction. First, is dissolved good solvent obtain solution containing asphaltenes, inorganic impurity as well residual carbons are r...

Journal: :Colloids and Surfaces A: Physicochemical and Engineering Aspects 2021

Asphaltenes are a group of exotic hydrocarbons found in bitumen and other forms heavy crude oil derivatives. These hydrocarbons, with elusive chemistry, give derivatives (CODs), such as bitumen, its characteristic properties. In they form stable aggregates by interacting molecules, called asphaltene aggregates. Attempts have been made to enhance nanoparticles, like graphene Such studies success...

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2006
siavash ashoori mohammad jamialahmadi h. müller steinhagen kaveh ahmadi

in this work, the precipitation and re-dissolution of asphaltenes were studied for an iranian relatively heavy crude oil. a series of experiments were designed and carried out to quantitatively examine the reversibility of asphaltenes precipitation upon the change in the solvent concentration along with the temperature. n-heptane was used as the precipitant, and a temperature range of 30 to 70°...

Journal: :The journal of physical chemistry. B 2010
Sara M Hashmi Abbas Firoozabadi

When oil is mixed with light alkanes, asphaltenes can precipitate out of oil solutions in a multistep process that involves the formation of nano and colloidal scale particles, the aggregation of asphaltene colloids, and their eventual sedimentation. Amphiphilic dispersants can greatly affect this process. The mechanism of the dispersant action in colloidal asphaltene suspensions in heptane has...

1998
Jianzhong Wu John M. Prausnitz Abbas Firoozabadi

Asphaltene precipitation is a perennial problem in producing and rejming crude oils. To avoid precipitation, it is usefid to know the solubility of asphaltenes in petroleum liquids as a function of temperature, pressure and liquid-phase composition In the novel molecular-thermodynamic flamework presented here, both asphaltenes and resins are represented by pseudo-pure components while all other...

Journal: :Energy & Fuels 2021

Chemical inhibition of asphaltene deposition is considered a cost-effective way to prevent the harsh consequences instability in produced crude. Thus, careful screening inhibitors crucial for an efficient prevention. However, characteristics asphaltenes such as their acid–base properties will influence selection inhibitor and mechanism. Therefore, improved knowledge on acidic basic fractions im...

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