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Inverse Gas Chromatographic Study of the Oxidation Stability of Lubricating Base Oils via Solubility Parameter Calculations

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色谱 2007年第6期25卷 871-875页

作者： moustafa nagy emam EISSA Elham Ahmed Egyptian Petroleum Research Institute

The Flory-Huggins interaction parameter(χ1,2∞) and solubility parameter(δ2) and its hydrogen bonding sensing component(δh) were determined using inverse gas chromatography(IGC).These parameters were successfully used in the probes of chemical changes that occur during the oxidation of naphthenic and paraffinic base oils in a GC *** in χ1,2∞ values reflect the different types of intermolecular interactions(dispersive,polar,hydrogen bonding) of the given lubricating base oil during *** obtained results showed that δh component of solubility parameter is the most important parameter for probing the oxidative-chemical changes during the oxidation of given lubricating oils.

关键词：反相气相色谱氧化稳定性润滑原油溶解参数计算

Simple identification approach for trace heteroatom-containing compounds in petroleum fraction by Automated Mass Spectral Deconvolution and Identification System

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色谱 2016年第9期34卷 925-932页

作者： moustafa nagy E Mahmoud Kout El-Kloub Fars Institute of Inorganic and Analytical Chemistry University of Munster Germany Munster 48149 Department of Chemistry Women's College for Arts Science and Education Ain Shams University Egypt Cairo 11566

Here we present a simple yet effective gas chromatography-mass spectrometry (GC-MS) identification approach for the detection of heteroatom-containing compounds (HACCs) in petroleum fractions. The MS/AMDIS (Automated Mass Spectral Deconvolution and Identification System) program was used to identify parts per million (ppm) HACC concentrations in petroleum fractions in place of traditional techniques (extraction and standard injection). Polycyclic aromatic sulfur heterocycles (S-PAHs) were used as model compounds to confirm the validity of the AMDIS identifiers, which were compared with extracted results using the off-line X-calibur software. AMDIS was able to identify ppm concentrations of S-PAHs in oil condensate. There was good agreement between experimental and AMDIS identification results for S-PAHs in oil condensate. AMDIS was also used to detect nitrogen-containing compounds (NCCs) and alkylphenols in oil condensate. Our results confirmed the presence of 2-methylbenzothiazole, carbazole, and 2,4-ditertbutyl phenol. In a crude oil sample, AMDIS identification of m/z=191 biomarkers was consistent with empirical results. Therefore, AMDIS can help to reduce the number of experimental steps in identification protocols.

关键词： Automated Mass Spectral Deconvolution and Identification System (AMDIS) heteroatom-containing compounds petroleum identification

新型包覆Pb纳米粒子液相色谱-串联质谱法用于鉴定沙特阿拉伯原油中的含氧化合物（英文）

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色谱 2018年第4期36卷 362-369页

作者： nagy E.moustafa Kout El-Kloub Fars MAHMOUD Egyptian Petroleum Research Institute Department of Chemistry Women's College for ArtsScience and EducationAin Shams University

Saudi Arabian crude oil is a super complex mixture and,up to now,there has been little research into its heteroatom-containing ***,oxygenated compounds(OCs)were isolated from Saudi Arabian oil using a Pd nanoparticle exchange complex,which formed between the nano-Pds and the oxygenated ***,polycyclic aromatic sulphur heterocycles(S-PAHs)are separated from petroleum oil via the same *** obtained results reveal that all the OC formulations with S-PAHs can be separated from the pre-isolated aromatic fraction of crude oil via this approach.S-PAHs are mixtures of benzothiophene and dibenzothiophene *** isolated OCs are composed mainly of hydroxyl *** liquid chromatography(LC)/electrospray ionization(ESI)in positive ion mode ESI(+)/tandem mass spectrometry(MS/MS)technique was used to assign the molecular weight distribution and identify the isolated *** LC/ESI(+)-MS/MS technique differentiates S-PAHs and OCs using protonated ***,LC/ESI(+)-MS/MS can be used to assign molecular weight distributions for both the groups as a single ***/MS in precursor ion mode was used for the immediate identification of the target S or O analytes.

关键词： liquid chromatography(LC) tandem mass spectrometry(MS/MS) Pd nanoparticles crude oil oxygenates