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Bencheng Wu,Jianhua Zhu,Xiaohui Li,Yanzhao Huang,Hui Cheng 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.6
Acidic species were extracted from heavy crude oil by alcohol-alkali solution and ion exchange resin. Theacidic species in the obtained extracts and extracted crude oil were characterized by negative-ion ESI FT-ICR MS. Theanalytical results indicated that some class species, O2, O1, N1, N1O1, N1O2, N1S1 and O2S1 etc., were identified in thenegative-ion spectrum, in which O2, O1 and N1 class showed much higher abundance than others. Compared to O1 andN1 class, O2 class could be extracted from heavy crude oil by using the two methods more efficiently, which meansthat a great majority of O2 class can be extracted; meanwhile, almost half of O1 and N1 class still remained in residualphase. Detailed analysis demonstrated that alcohol-alkali method was effective for extracting O2, O1 and N1 class withlower molecular weight; ion exchange method, however, was helpful to extract higher molecular weight O1 and N1class and showed almost equal extraction selectivity to all kind of O2 class.
Xiaohui Li,Jianhua Zhu,Bencheng Wu 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.1
The distribution of basic nitrogen-containing compounds in three vacuum gas oils (VGOs) with different boiling ranges and their dewaxed oils from the lube base oil refining unit of a refinery were characterized by positive-ion electrospray ionization (ESI) Fourier transform-ion cyclotron resonance mass spectrometry (FT- ICR MS). It turned out that the composition of basic nitrogen compounds in the samples varied significantly in DBE and carbon number, and the dominant basic N-containing compounds in these oil samples were N 1 class species. N 1 O 1 , N 1 O 2 , and N 2 class species with much lower relative abundance were also identified. The composition of basic nitrogen compounds in VGOs and dewaxed VGOs were correlated with increased boiling point and varied in DBE and carbon numbers. The comparison of the analytical results between VGOs and dewaxed VGOs indicated that more basic N-containing compounds in VGO with low carbon number and small molecular weight tend to be removed by solvent refining in lube base oil processing.
Li, Xiaohui,Zhu, Jianhua,Wu, Bencheng Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.1
The distribution of basic nitrogen-containing compounds in three vacuum gas oils (VGOs) with different boiling ranges and their dewaxed oils from the lube base oil refining unit of a refinery were characterized by positive-ion electrospray ionization (ESI) Fourier transform-ion cyclotron resonance mass spectrometry (FT-ICR MS). It turned out that the composition of basic nitrogen compounds in the samples varied significantly in DBE and carbon number, and the dominant basic N-containing compounds in these oil samples were N1 class species. $N_1O_1$, $N_1O_2$, and $N_2$ class species with much lower relative abundance were also identified. The composition of basic nitrogen compounds in VGOs and dewaxed VGOs were correlated with increased boiling point and varied in DBE and carbon numbers. The comparison of the analytical results between VGOs and dewaxed VGOs indicated that more basic N-containing compounds in VGO with low carbon number and small molecular weight tend to be removed by solvent refining in lube base oil processing.
Separation and Characterization of Organic Chlorides in a Chinese Crude Oil
Xiaohui Li,Rui Ma,Liang Ding,Huiying Yuan,Bencheng Wu,Jianhua Zhu 대한화학회 2018 Bulletin of the Korean Chemical Society Vol.39 No.4
A crude oil from Shengli oilfield of China was extracted with N,N‐dimethylformamide (DMF) for separation and enrichment of organic chlorides. The resulting extract with relatively higher chlorine concentration was analyzed with gas chromatography–mass spectrometry (GC/MS). Among the identified heteroatom compounds in the extract sample, nitrogen‐containing compounds were most abundant in the extract sample, followed by chlorine‐, sulfur‐, and oxygen‐containing compounds, respectively. Four organochlorines with an aromatic core structure, i.e., 5‐chloro‐2‐methylaniline, 2‐chloro‐6‐methylaniline, 4‐chloro‐2‐nitrotoluene, and 1‐(5‐chloro‐2‐hydroxyphenyl)ethanone, were identified from crude oil extract. The dominant abundant organic chloride is 5‐chloro‐2‐methylaniline with relative content of 65.1% in the total of identified organic chlorides, followed by 1‐(5‐chloro‐2‐hydroxyphenyl)ethanone of 16.3%, 2‐chloro‐6‐methylaniline of 14.5%, and 4‐chloro‐2‐nitrotoluene of 4.1%, respectively.