Planar chromatographic separation of petroleum residues and coal-derived liquids

Deelchand, J.-P.; Naqvi, Zainab; Dubau, C.; Shearman, J.; Lázaro, M.J.; Herod, Alan A.; Read, H.; Kandiyoti, R.

doi:10.1016/s0021-9673(98)00927-3

Cited by 37 publications

(45 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This contrasts markedly with fractions of coal-derived liquids separated by solvent solubility or by planar chromatography, 12±14,25 where large shifts towards longer wavelengths have been observed with increasing solvent polarity. However, observations on petroleum vacuum residues 14,16,17 were similar to those outlined above for amber-derived material, in the sense that UV-fluorescence spectra showed quantitative rather than qualitative differences.…”

Section: Uv-¯uorescence Spectrasupporting

confidence: 69%

“…The insolubility of the residue appears to have resulted from the remaining material being of molecular masses that were too large to go into solution. The discontinuity observed in all the SEC profiles shown here and for coal-derived samples, 8,11,14 as well as for petroleum residues 14,16,17 and biomass tars, 15 cannot be explained easily, but since the MALDI mass spectra of pitch fractions 10,11 show no discontinuity of mass from around 1000 u up to 100 000 u, it seems probable that the discontinuity may result from a change of molecular shape which becomes possible above a mass of about 3000 u.…”

Section: Size Exclusion Chromatographymentioning

confidence: 63%

See 1 more Smart Citation

Structural characterisation of Baltic amber and its solvent extracts by several mass spectrometric methods

Islas

Suelves

Carter

et al. 2001

Rapid Comm Mass Spectrometry

Self Cite

View full text Add to dashboard Cite

A sample of Baltic amber ( approximately 40 million yrs old) has been extracted using pentane, toluene and 1-methyl-2-pyrrolidinone (NMP). The relationship between solubility characteristics of the extracts in relation to molecular mass and chemical makeup has been investigated. The extracts were first characterised by (13)C-NMR spectrometry, size exclusion chromatography (SEC) and UV-fluorescence spectroscopy. The fractions differed less in terms of chemical structural features than they did in terms of molecular mass. This contrasts markedly with data on fractions of coal-derived liquids, but parallels results from petroleum-derived vacuum residues. In SEC, the toluene soluble/pentane insoluble fraction gave a peak for high mass material at about 67 000 u. Material excluded from the column porosity in this fraction and in NMP solubles eluted between 8 and 11 min, corresponding to polystyrene masses between 200 000 and several million u. A column with a larger pore size distribution was calibrated using polystyrene and polymethylmethacrylate standards with detection by a light-scattering evaporative analyser. The largest polystyrene standard (15.4 million u) eluted at 13.4 min, similar to that of the earliest eluting amber-derived material in the NMP solubles fraction. Results from probe-MS and pyrolysis-GC/MS have been used to confirm the similarity of chemical structures of the three solubility fractions. Broadly, low mass ions appear to correspond to the various monomeric units of structures present in the amber, the higher mass ions to dimer units and the molecular ions to the different combinations of three or more monomeric units. The main monomer groups have been identified in detail, showing a situation very different from that of coal-derived materials, where the sizes of aromatic ring systems increase with molecular size.

show abstract

Section: Uv-¯uorescence Spectrasupporting

confidence: 69%

Section: Size Exclusion Chromatographymentioning

confidence: 63%

Structural characterisation of Baltic amber and its solvent extracts by several mass spectrometric methods

Islas

Suelves

Carter

et al. 2001

Rapid Comm Mass Spectrometry

Self Cite

View full text Add to dashboard Cite

show abstract

“…The petroleum atmospheric distillation residue was provided by the Petrox refinery near Concepción (Chile) and has been described previously [7][8][9][10]. It was obtained from the bottom of an atmospheric-pressure distillation column, where 70% of the oil vaporizes while the rest of the feed is treated with a steam counterflow at 370°C which removes lighter components of the oil.…”

Section: Samplesmentioning

confidence: 99%

The Pentane- and Toluene-Soluble Fractions of a Petroleum Residue and three Coal Tars by Size Exclusion Chromatography and UV-Fluorescence Spectroscopy

Karaca

Millán

Morgan

et al. 2007

Oil & Gas Science and Technology - Rev. IFP

Self Cite

View full text Add to dashboard Cite

Résumé -Les fractions solubles dans le pentane et le toluène d'un résidu pétrolier et de trois échantillons de goudron de charbons par chromatographie d'exclusion stérique et par spectroscopie de fluorescence -Un résidu pétrolier de distillation atmosphérique ainsi que trois échantillons de goudron issus des pyrolyses de différents charbons sont séparés en sept fractions par chromatographie liquide sur gel de silice. Les solvants utilisés successivement sont : le pentane, le toluène, l'acétonitrile, la pyridine, la 1-methyl-2-pyrrolidinone (NMP) et l'eau permettant l'obtention de 7 fractions. Les fractions obtenues pour chacun des quatre échantillons sont ensuite comparées par chromatographie d'exclusion stérique (SEC) au moyen d'NMP comme éluant, puis par spectroscopie de fluorescence. Cet article traite uniquement le cas des fractions solubles dans le pentane et le toluène, car étant les moins polaires. D'après les analyses SEC, la taille des molécules aromatiques entre les premières fractions solubles dans le pentane et celles solubles dans le toluène augmente. Ainsi, les fractions du résidu pétrolier possèdent des molécules de plus grande taille que celles extraites, par le même solvant, pour les différents goudrons. Les trois échantillons de goudrons montrent des différences significatives, indiquant que la température de pyrolyse joue un rôle important sur la taille des molécules. Les résultats de spectroscopie, en solution NMP, montrent également de grandes différences entre le résidu pétrolier et les trois goudrons, de même que ces trois derniers sont différents entre eux. En général, les fractions du résidu pétrolier contiennent de plus petits groupes aromatiques que les fractions liquides issues du charbon. Ces fractions de faible polarité, contenant des éléments exclus par la colonne chromatographique, ont peu de chance d'être des agrégats de molécules polaires. Abstract

show abstract

“…Thin layer chromatography has been used extensively in the work at Imperial College [24][25][26][27][28][29][30][31][32][33]. In more recent work [34][35][36][37][38] analytical plates from Whatman with flexible backing have been used.…”

Section: Thin Layer Chromatographymentioning

confidence: 99%

Characterization of Tars from the Thermal Processing of Baganuur and Tavan Tolgoi Coals from Mongolia, Using SEC, UV-F, IR and Mass Spectrometry

Purevsuren¹,

Davaajav²,

Batbilig³

et al. 2013

ACES

View full text Add to dashboard Cite

Tars from two Mongolian coals (Tavan Tolgoi and Baganuur) produced by simple distillation have been characterized using size exclusion chromatography (SEC) with elution in both 1-methyl-2-pyrrolidinone (NMP) and a mixed solvent (NMP and chloroform), UV-fluorescence in chloroform and NMP, gas chromatography (GC), mass spectrometry (GC-MS, probe-MS and LD-MS with thin layer chromatography) and infra-red spectroscopy. The SEC chromatograms using NMP and the solvent mixture NMP: chloroform indicates that similar conclusions can be drawn from using either eluent. The synchronous UV-fluorescence spectra were shifted to longer wavelengths in chloroform solution than in NMP and chloroform may be the better solvent for these tars prepared without extensive secondary thermal treatment. Infra-red spectra indicated differences between the two coal tars that reflected their different ranks, with more oxygenate groups in the lower rank Baganuur coal. Mass spectrometry (GC-MS and probe-MS) of both coal tars confirmed the presence of aliphatic components as well as aromatics and the relatively extensive alkylation of aromatics. Molecular mass ranges indicated for Baganuur tar by SEC compared well with the mass range by LD-MS although the LD-MS extended to higher mass values. The high mass fractions of the tars were revealed by fractionation by thin layer chromatography with the relevant sections of the developed plates inserted directly into the mass spectrometer; laser desorption was directly from the surface of the plate. LD-MS of the unfractionated samples failed to detect the high mass components because of mass discrimination effects. The high mass components were carried over in the distillation by mass transfer of vapours into the condenser.

show abstract

Planar chromatographic separation of petroleum residues and coal-derived liquids

Cited by 37 publications

References 31 publications

Structural characterisation of Baltic amber and its solvent extracts by several mass spectrometric methods

Structural characterisation of Baltic amber and its solvent extracts by several mass spectrometric methods

The Pentane- and Toluene-Soluble Fractions of a Petroleum Residue and three Coal Tars by Size Exclusion Chromatography and UV-Fluorescence Spectroscopy

Characterization of Tars from the Thermal Processing of Baganuur and Tavan Tolgoi Coals from Mongolia, Using SEC, UV-F, IR and Mass Spectrometry

Contact Info

Product

Resources

About