Separation of Asphaltene by Dimethyl Ether

Sato, Shinya; Matsumura, Akimitsu

doi:10.1627/jpi.53.256

Cited by 4 publications

(5 citation statements)

References 8 publications

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“…Recently, the solvent deasphalting power of dimethyl ether, a promising alternative to diesel fuels, has been found to be comparable to that of npentane. 25 Also, using a well-documented solvent mixture of nheptane and toluene (heptol), the solvent deasphalting power can be decreased with increasing amounts of toluene added to n-heptane. 26,27 Several papers describe the solubility of nalkane-precipitated asphaltenes in different solvent and solvent mixes, including ethyl acetate, acetone, methyl isobutyl ketone, acetyl acetone, and carbon tetrachloride, in work performed by Seidl et al 28 Mitchell and Speight 5 tested an extensive list of liquid precipitants for asphaltene precipitation using an Athabasca bitumen sample and found correlations between the quantities of asphaltenes precipitated and both the surface tension and Hildebrand solubility parameter of the liquid precipitants used in their study.…”

Section: Introductionmentioning

confidence: 99%

“…Conductivity studies have shown that irreversibility is dependent upon sample history . The occurrence and amounts of asphaltenes may vary with changes in experimental conditions, such as solvent, pressure, contact time, temperature, and the ratio between the liquid precipitant and crude oil. − Calles et al have studied the temperature effect on asphaltene precipitation using n -pentane, n -hexane, and n -heptane, while Maqbool et al , studied the kinetics of asphaltene precipitation. Luo et al have investigated the effect of using gaseous and (partially) liquefied propane as the precipitating agent, as compared to using n -pentane and n -heptane.…”

Section: Introductionmentioning

confidence: 99%

“…Luo et al have investigated the effect of using gaseous and (partially) liquefied propane as the precipitating agent, as compared to using n -pentane and n -heptane. Recently, the solvent deasphalting power of dimethyl ether, a promising alternative to diesel fuels, has been found to be comparable to that of n -pentane . Also, using a well-documented solvent mixture of n -heptane and toluene (heptol), the solvent deasphalting power can be decreased with increasing amounts of toluene added to n -heptane. , Several papers describe the solubility of n -alkane-precipitated asphaltenes in different solvent and solvent mixes, including ethyl acetate, acetone, methyl isobutyl ketone, acetyl acetone, and carbon tetrachloride, in work performed by Seidl et al…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Asphaltene Precipitation from Athabasca Bitumen Using an Aromatic Diluent: A Comparison to Standardn-Alkane Liquid Precipitants at Different Temperatures

Bjorøy¹,

Fotland

Gilje

et al. 2012

Energy Fuels

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Asphaltenes are precipitated from Athabasca bitumen upon the addition of liquid precipitants. The asphaltene onset and the amount of precipitated asphaltenes using different equivalents of added liquid precipitant are determined. The deasphalting power of an aromatic solvent with structural similarities to toluene, namely, α,α,α-trifluorotoluene (BTF), is investigated, and the results are compared to using n-pentane (n-C5), n-hexane (n-C6), and n-heptane (n-C7) as liquid precipitants. A correlation between maximum asphaltene precipitation and the surface tension of the pure liquid precipitants studied is observed. Increasing the temperature results in increasing the volume fraction of liquid precipitant at the asphaltene onset and a decrease in the amount of maximum asphaltene precipitation. Composition elemental analyses show a small increase in the relative amounts of sulfur atoms in asphaltenes with increasing precipitation temperatures. The appearances of asphaltenes precipitated at different temperatures are compared before and after thorough washing with excess liquid precipitant. Asphaltene precipitation experiments are time-consuming and have motivated us to introduce an empirical function to describe asphaltene yields between asphaltene onset and maximum asphaltene precipitation requiring less experimental data. Our results provide useful tools for future studies of gradient asphaltene precipitation; processes that are of current interest with the development of new(er) techniques for bitumen extraction.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Asphaltene Precipitation from Athabasca Bitumen Using an Aromatic Diluent: A Comparison to Standardn-Alkane Liquid Precipitants at Different Temperatures

Bjorøy¹,

Fotland

Gilje

et al. 2012

Energy Fuels

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“…The supercritical solvent deasphalting process is an effective method to remove most asphaltene and yield high-quality deasphalted oil (DAO) as fluid catalytic cracking and hydrocracking feedstocks because of its low metal (Ni + V) contents. − A number of studies has been performed to study solvent deasphalting with various solvents and feedstocks. − Granulation of post-extraction asphalt residue in the selective asphaltene extraction (SELEX-Asp) process is a new development of supercritical solvent deasphalting . The de-oil asphalt (DOA) can be produced in the form of particles and as a feedstock of pitch-water slurry for combustion or gasification.…”

Section: Introductionmentioning

confidence: 99%

Softening Point: An Indicator of Asphalt Granulation Behavior in the Selective Asphaltene Extraction (SELEX-Asp) Process

Meng

Sun

et al. 2011

Energy Fuels

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Granulation is an effectual method to deal with huge amounts of deoiled asphalt (DOA) produced in the residue selective asphaltene extraction (SELEX-Asp) process, and the softening point of DOA plays an important role in asphalt particle production. In this paper, the variation of the softening point under different operation conditions and its influence on asphalt granulation behavior were studied with various solvents and feedstocks. Moreover, properties and structures of five C7 asphaltenes were analyzed with 13C nuclear magnetic resonance (NMR) and X-ray diffraction (XRD) measurements to examine the reasons of asphalt softening point differences for various residues under the same operation conditions. Ordered degree index (OI) and softening point index (SI) were proposed to investigate the influence of asphalt ordered aromatic sheets on the softening point. High softening point asphalt could be obtained with lower temperatures and higher pressures of the extractor, a larger mass ratio of solvent to feed, and a heavier solvent. Asphalt tends to form particles with the increase of the softening point, and nice particles would be produced when the softening point is higher than 170 °C. OI of C7 asphaltene is an important factor affecting the asphalt softening point. A close correlation between SI and the softening point was established; that is, feedstocks with a high SI would have the ability to produce high softening point asphalt and possess a good asphalt granulation behavior. The quantity of ordered aromatic sheets in asphalt is the fundamental determinant of the softening point.

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“…A literature survey revealed that variety of organophosphorus compounds such as octyl(phenyl)-N,Ndiisobutylcarbamoylmethyl phosphine oxide [11], cyanex 923 [12], 1,3-benzenedimethylbis(phenylphosphinic acid) [13], bis(2-ethylhexyl)-phosphinic acid [14], tributyl phosphine oxide [15], di-(2-ethylhexyl)-phosphoric acid [16], tri-n-octylphosphine oxide [17] are reported. However, these methods yield incomplete separation and not free from interferences of associated metal ions.…”

Section: Introductionmentioning

confidence: 99%

Solvent extraction of lanthanum(III) by N-n-octylaniline from salicylate media

Kokare

Han

Anuse

2009

Desalination and Water Treatment

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ab s t r ac tIn this paper, solvent extraction of lanthanum(III) using N-n-octylaniline in salicylate media has been systematically investigated. The effect of various parameters, such as equilibrium time, aqueous pH, extractant concentration, weak acid concentration, aqueous to organic volume ratio, back strippant and organic solvent, on the extraction have been discussed. Lanthanum(III) is quantitatively extracted at pH 5.3-6.5 from 0.04 M sodium salicylate with 0.065 M N-n-octylaniline dissolved in xylene. Experimental data have been analysed graphically to determine the stoichiometry of extracted species [RR'NH 2 + La(sal) 2 -] (org) . The extracted metal ion was separated by using selective strippant and estimated spectrophotometrically with arsenazo I. The method is applicable for binary separation of lanthanum(III) from yttrium(III) and associated metal ions.

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Separation of Asphaltene by Dimethyl Ether

Cited by 4 publications

References 8 publications

Asphaltene Precipitation from Athabasca Bitumen Using an Aromatic Diluent: A Comparison to Standardn-Alkane Liquid Precipitants at Different Temperatures

Asphaltene Precipitation from Athabasca Bitumen Using an Aromatic Diluent: A Comparison to Standardn-Alkane Liquid Precipitants at Different Temperatures

Softening Point: An Indicator of Asphalt Granulation Behavior in the Selective Asphaltene Extraction (SELEX-Asp) Process

Solvent extraction of lanthanum(III) by N-n-octylaniline from salicylate media

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