Amphiphile adsorption on asphaltene particles: adsorption isotherms and asphaltene stabilization

León, O.; Contreras, E.; Rogel, Estrella

doi:10.1016/s0927-7757(01)00606-9

Cited by 33 publications

(27 citation statements)

References 17 publications

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“…Their molecular structures include polycyclic aromatic compounds in the core and aliphatic chains in their side branches. [1] Asphaltenes contain nitrogen, oxygen, sulphur, etc. ; these atoms are substituted for carbon atoms in the aromatic rings or aliphatic chains.…”

Section: Introductionmentioning

confidence: 99%

Asphaltene solubility in common solvents: A molecular dynamics simulation study

et al. 2015

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Solubility of all proposed molecular models of asphaltene in various solvents is studied through molecular dynamics simulation to find the structural parameters which have a determining effect on asphaltene solubility. It is found that higher numbers of aromatic rings and heteroatoms such as oxygen, nitrogen, and sulphur in the molecular structure of asphaltenes raises their solubility in the solvents, whereas the length of aliphatic group, which increases the chain length, lowers their solubility. In addition, a cubic correlation equation for evaluating the asphaltene solubility parameter as a ratio of number of aromatic rings in the asphaltene molecular core to the number of carbon atoms in the asphaltene side chains is proposed. The results indicate that the relative energy difference (RED) of asphaltene models and isopropyl benzene, as a solvent, is the lowest compared with other solvents. To elucidate the mechanism of asphaltene dissolution in the common solvents the solubility of two asphaltene structural models in three solvents, including isopropyl benzene, toluene, and heptane, were studied by evaluating the radial distribution functions (RDFs) of the asphaltenes, and the results confirm that asphaltene has the highest solubility in isopropyl benzene.

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Section: Introductionmentioning

confidence: 99%

Asphaltene solubility in common solvents: A molecular dynamics simulation study

et al. 2015

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“…Asphaltenes are the heaviest and most complex fraction of crude oil. 1 This fraction plays a major role in the formation of deposits that affect the worldwide crude oil production, 2 and they are commonly presumed to represent the most refractory and difficult portion of the feedstock to process. Asphaltenes are the most aromatic and highest molecular weight portion of crude oil and are defined as the fraction that is soluble in toluene or benzene and insoluble in low-boiling alkanes such as n-pentane or n-heptane.…”

Section: Introductionmentioning

confidence: 99%

“…Asphaltenes are the heaviest and most complex fraction of crude oil . This fraction plays a major role in the formation of deposits that affect the worldwide crude oil production, and they are commonly presumed to represent the most refractory and difficult portion of the feedstock to process.…”

Section: Introductionmentioning

confidence: 99%

Exploring the Structure–Solubility Relationship of Asphaltene Models in Toluene, Heptane, and Amphiphiles Using a Molecular Dynamic Atomistic Methodology

et al. 2011

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The solubility parameters, δ, of several asphaltene models were calculated by mean of an atomistic NPT ensemble. Continental and archipelago models were explored. A relationship between the solubility parameter and the molecule structure was determined. In general, increase of the fused-rings number forming the aromatic core and the numbers of heteroatoms such as oxygen, nitrogen, and sulfur produces an increase of the solubility parameter, while increases of the numbers and length of the aliphatic chains yield a systematic decrease of this parameter. Molecules with large total carbon atom number at the tails, n(c), and small aromatic ring number, n(r), exhibit the biggest values of δ, while molecules with small n(c) and large n(r) show the smallest δ values. A good polynomial correlation δ = 5.967(n(r)/n(c)) - 3.062(n(r)/n(c))(2) + 0.507(n(r)/n(c))(3) + 16.593 with R(2) = 0.965 was found. The solubilities of the asphaltene models in toluene, heptane, and amphiphiles were studied using the Scatchard-Hildebrand and the Hansen sphere methodologies. Generally, there is a large affinity between the archipelago model and amphiphiles containing large aliphatic tails and no aromatic rings, while continental models show high affinity for amphiphiles containing an aromatic ring and small aliphatic chains.

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“…Derajat kelarutan asphaltene pada beberapa konsentrasi surfaktan MESA dan MES dalam toluen Leon et al (2001) mengemukakan bahwa kestabilan asphaltene meningkat seiring dengan peningkatan konsentrasi surfaktan yang teradsorpsi di permukaan partikel asphaltene. Namun adsorpsi ini dibatasi oleh beberapa faktor, diantaranya adalah luas bidang aktif partikel asphaltene dan konsentrasi terbaik surfaktan yang dapat teradsorpsi di permukaan partikel asphaltene.…”

Section: Kelarutan Asphalteneunclassified

Formulasi Dan Uji Kinerja Asphaltene Dissolver Dengan Penggunaan Surfaktan Anionik Dari Minyak Sawit

Rasdiana¹,

Hambali²,

Permadi³

2017

j.tek.ind.pert

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Asphaltene deposition is a major problem in petroleum industry ABSTRAKDeposisi asphaltene merupakan masalah utama pada industri perminyakan yang menyebabkan lambatnya proses produksi atau bahkan pemberhentian proses produksi. Penelitian ini dilakukan untuk menghasilkan formulasi asphaltene dissolver terbaik yang dapat menghilangkan deposit asphaltene dengan penggunaan surfaktan anionik dari minyak sawit dan untuk mendapatkan informasi kinerja asphaltene dissolver yang dihasilkan. Formulasi yang diujikan adalah surfaktan methyl ester sulfonate acid (MESA)dan methyl ester sulfonate (MES) dengan konsentrasi masing-masing 0%, 1%, 3%, 5% dalam toluen yang dicampurkan pada suhu 40 o C selama 30 menit. Asphaltene dissolver terbaik yang dihasilkan adalah campuran surfaktan MESA 1% dalam toluen yang menghasilkan derajat kelarutan asphaltene sebesar 69,58% dengan nilai tegangan antarmuka terendah yaitu sebesar 3,95x10 -3 dyne/cm. Asphaltene dissolver yang dihasilkan menunjukkan kinerja yang baik dalam mengubah sudut kontak batuan dari 48,6 o menjadi 80,89 o dan dapat meningkatkan sifat kebasahan pada permukaan logam dengan pelepasan asphaltene sebesar 99,32% serta memperlihatkan performa dispersi, desorpsi, dan filtrasi yang baik.Kata kunci : asphaltene, asphaltene dissolver, surfaktan anionik, MESA PENDAHULUANAsphaltene merupakan golongan fraksi berat dari minyak bumi dan diterminologikan sebagai komponen sangat aromatik berwarna hitam yang mengandung makromolekul heterosiklik tak jenuh dengan komponen utama yaitu karbon, hidrogen, dan komponen minor lain seperti sulfur, oksigen, nitrogen, serta akumulasi beberapa jenis logam berat seperti besi, nikel, vanadium, aluminium, dan magnesium. Asphaltene membentuk sistem koloid dalam minyak bumi dengan adsorpsi resin pada bagian permukaan yang membentuk stabilisasi sterik sehingga mampu mempertahankan partikel asphaltene tetap larut dalam minyak bumi (Okafor et al., 2013).Keberadaan asphaltene di dalam minyak bumi bukanlah sebagai molekul terlarut, melainkan sebagai nanopartikel yang dapat membentuk agregat. Ketika terjadinya perubahan kondisi termodinamika selama proses produksi minyak bumi, kestabilan nanopartikel akan terganggu sehingga saling bertumbukan dan membentuk agregat yang terus tumbuh menjadi partikel yang lebih besar dari ukuran nano, mikron, sampai terbentuknya deposisi pada daur hidup produksi minyak bumi seperti perforasi, tubing, downhole, dan peralatan permukaan (Oseghale dan Ebhodaghe, 2011).

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Amphiphile adsorption on asphaltene particles: adsorption isotherms and asphaltene stabilization

Cited by 33 publications

References 17 publications

Asphaltene solubility in common solvents: A molecular dynamics simulation study

Asphaltene solubility in common solvents: A molecular dynamics simulation study

Exploring the Structure–Solubility Relationship of Asphaltene Models in Toluene, Heptane, and Amphiphiles Using a Molecular Dynamic Atomistic Methodology

Formulasi Dan Uji Kinerja Asphaltene Dissolver Dengan Penggunaan Surfaktan Anionik Dari Minyak Sawit

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