Introduction Nature of Chromatographic Interactions Molecular Interpretation of Distribution Processes in Chromatography Determination of Chromatographic Retention Data for Quantitative Structure-Retention Relationship Studies Methodology of Quantitative Structure-Retention Relationship Analysis Additive Structural Parameters in Quantitative Structure-Retention Relationship Studies Parameters Related to Specific Physicochemical Properties of Solutes Topological Indices as Retention Descriptors Multiparameter Structure-Chromatographic Retention Relationships Application of Factor Analysis in QSRR Studies Relationship Between Liquid Chromatographic Retention Data and Partition Coefficients Chromatographic Retention Data in Studies of Quantitative Structure-Biological Activity Relationships Index.

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Quantitative structure-chromatographic retention relationships

http://pure.tudelft.nl/ws/files/11926671/1_s2.0_S0378775316308631_main.pdf

A review of fuel cell systems for maritime applications

Quantitative structure-(chromatographic) retention relationships.

Millions of tons of vacuum residues are produced in refineries every year and could be a potentially valuable resource for generating electricity and has possible application as heating and marine fuel. In this work, the polycyclic aromatic sulfur compounds (PASHs) from the aromatic fraction of vacuum residue before and after partial hydrodesulfurization (HDS) were derivatized by methylation to the methylsulfonium salts. Fourier transform ion cyclotron resonance mass spectrometry provided high-resolution data on these high-molecular-weight sulfur compounds. Compounds containing one and two S atoms were found to dominate, with masses up to ca. 900 Da. Classification according to hydrogen deficiency and the number of heteroatoms showed extensive series of homologues for double bond equivalents from 5 to 20. The sulfur-containing aromatics were separated using a palladium(II) complex as a liquid chromatographic phase into two compound groups: one containing compounds with an unconjugated thiophene ring and another with a condensed thiophene ring. This, combined with the mass spectrometry (MS) data, allows for the identification of several parent structures. Partial HDS removed primarily compounds with one S atom, whereas those with two S atoms were largely unaffected.

Characterization of high-molecular-weight sulfur-containing aromatics in vacuum residues using Fourier transform ion cyclotron resonance mass spectrometry.

Inhaltsangabe: Eine grose Hurde fur eine optimale Energiegewinnung aus Erdol ist die Komplexitat und Vielfalt der darin enthaltenen Verbindungen. Eine Untersuchung verschiedener Ionisierungsmethoden fur die Massenspektrometrie ergibt, dass das Massenspektrum einer Erdolprobe stark von der jeweils verwendeten Methode abhangt.

Characterization of Supercomplex Crude Oil Mixtures: What Is Really in There?

Selective removal of sulphur in liquid fuels for fuel cell applications

Speciation of alkylated dibenzothiophenes through correlation of structure and gas chromatographic retention indexes.

Polycyclic Aromatic Sulfur Heterocycles in Desulfurized Diesel Fuels and Their Separation on a Novel Palladium(II)-Complex Stationary Phase

A diesel fuel desulfurized to 76 and 13 ppm sulfur in the aromatic fraction was analyzed with the objective of performing a speciation of the polycyclic aromatic sulfur heterocycles present. This provides information of importance to catalyst and process development. The analysis was based on selectively separating the sulfur from the non-sulfur aromatic compounds on a PdII-containing liquid chromatographic phase, followed by identification and quantification using gas chromatography with mass-selective and sulfur-selective atomic emission detection. Several newly synthesized alkyldibenzothiophenes (mainly C3- and C4DBTs) could be quantified, and isomers with up to six alkyl carbon atoms could be detected in the diesel fuel. Besides confirmation that substituents in the 4 position of a dibenzothiophene lead to low rates of hydrodesulfurization (HDS), it is reported for the first time that a methyl group in the 1 position can also lead to a lower reactivity under HDS conditions, allowing such compounds to ...

Speciation of alkylated dibenzothiophenes in a deeply desulfurized diesel fuel

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Selective removal of sulphur in liquid fuels for fuel cell applications

Speciation of alkylated dibenzothiophenes through correlation of structure and gas chromatographic retention indexes.

Polycyclic Aromatic Sulfur Heterocycles in Desulfurized Diesel Fuels and Their Separation on a Novel Palladium(II)-Complex Stationary Phase

Speciation of alkylated dibenzothiophenes in a deeply desulfurized diesel fuel