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Yinchuan, China

Yanzhen W.,China University of Petroleum - East China | Jinyun L.,China University of Petroleum - East China | Yanli D.,Shenhua Ningxia Coal Group | Hongling D.,China University of Petroleum - East China
Petroleum Processing and Petrochemicals | Year: 2014

The environmental rubber oil or FCC feedstock were prepared from FCC slurry using furfural as a extract solvent and petroleum ether as a co-solvent. The influence factors of extract temperature, solvent/oil ratio and extraction stages were investigated by crosscurrent extraction and countercurrent extraction process. The results show that the optimum conditions for single-stage extraction were: extraction temperature of 50 °C and solvent/oil ratio of 2. 5:1. At this condition the extraction effect becomes better with the extraction stage increasing. At three extraction stages, the polycyclic aromatic hydrocarbons (PCA) content of the refined oil obtained from the two processes were both less than 3% and their aromatic carbon rates were above 10%, meeting the EU requirements for environmental rubber oils. At the same time, the density of the refined oil was dropped below 0. 9 g/cm3 and the saturated hydrocarbon content reaches above 80%, which was considered to be a qualified FCC feedstock. The yield of the refined oil obtained from the multi-stage countercurrent extraction process reaches above 30%, remarkably higher than the yield obtained from the crosscurrent extraction process. Source


Peng F.,University of Science and Technology Beijing | Ji H.,University of Science and Technology Beijing | Yan X.,Shenhua Ningxia Coal Group
Applied Mechanics and Materials | Year: 2012

Rock bolting is one of the most common methods of rock reinforcement. To optimize bolt parameters for reasonably playing its properties under safe support condition, it's a must to study the mechanical characteristics of roadway and bolt. This paper shows that anchor bolts at the top of the rise side has the maximum force, middle of the two sides minimal. Middle of two sides has the largest displacement, top and bottom smallest by using flac3d to simulate the force of special-shaped roadway under the support of anchor bolts, combined with field observance of anchor bolts force. Therefore, by optimizing anchor bolts supporting parameters, we can effectively control the deformation of surrounding rocks and improve the whole stability through strengthening support and changing partial anchor bolts supporting parameters. © (2012) Trans Tech Publications, Switzerland. Source


Feng Y.X.,Pingdingshan University | Xue L.W.,Pingdingshan University | Zhang C.X.,Shenhua Ningxia Coal Group
Russian Journal of Coordination Chemistry/Koordinatsionnaya Khimiya | Year: 2014

A new oxovanadium(V) complex, [VO(L)(Phen)], where L is the dianionic form of N-(2-hydroxynaphthylidene)-4-chlorobenzohydrazide, Phen is 1,10-phenanthroline, has been synthesized and characterized by elemental analysis, FT-IR spectra, and single crystal X-ray determination. The crystal of the complex is monoclinic: space group P21/c, a = 11.2376(8), b = 13.3068(10), c = 17.5593(11) Å, β = 106.806(2)°, V = 2513.6(3) Å3, Z = 4. The V atom in the complex is in octahedral coordination, with the phenolate O, imine N, and enolate O atoms of L and one N atom of Phen define the equatorial plane, and with the other N atom of Phen and one oxo O atom located at the axial positions. The complex is a good catalyst for the oxidation of thioanisole to the corresponding sulfoxide by cumene hydroperoxide. © 2014 Pleiades Publishing, Ltd. Source


Xu F.,Pingdingshan University | Xue L.-W.,Pingdingshan University | Zhang C.-X.,Shenhua Ningxia Coal Group
Synthesis and Reactivity in Inorganic, Metal-Organic and Nano-Metal Chemistry | Year: 2015

A new dinuclear oxovanadium(V) complex, [VO2(EMP)]2·BPY, where EMP is the mono-anionic form of 2-{[2-(2-hydroxyethylamino)ethylimino]methyl}-6-methylphenol (HEMP), and BPY is 4,4-bipyridine, has been synthesized and characterized by elemental analysis, FT-IR spectra, and single-crystal X-ray determination. The crystal of the complex is triclinic: space group P, a = 7.473(2) Å, b = 9.193(2) Å, c = 13.525(2) Å, α = 82.726(2)°, β = 83.253(2)°, γ = 69.861(2)°, V = 862.6(3) Å3, Z = 1. The asymmetric unit of the compound contains a dinuclear oxovanadium complex molecule and a 4,4-bipyridine molecule. The V⋯V distance is 3.153(1) Å. The V atoms in the complex are in octahedral coordination. The antibacterial activity of the compound against various bacteria was assayed. Copyright © 2015 Taylor & Francis Group, LLC. Source


Zhao X.-J.,Pingdingshan University | Xue L.-W.,Pingdingshan University | Zhang C.-X.,Shenhua Ningxia Coal Group
Synthesis and Reactivity in Inorganic, Metal-Organic and Nano-Metal Chemistry | Year: 2015

A new halo-substituted Schiff base ligand 2-bromo-6-[(2-ethylaminoethylimino)methyl]phenol (HL) and its copper(II) and zinc(II) complexes [Cu2L2(μ1,1-NCS)2] (1) and [ZnCl2(HL)] (2) (HL is the zwitterionic form of the Schiff base ligand) have been prepared and characterized by elemental analyses, IR, and single-crystal X-ray crystallographic determination. The crystal of (1) is monoclinic: space group P21/c, a = 10.909(1), b = 13.976(1), c = 10.161(1) A˚, β = 111.471(2)°, V = 1441.7(2) A˚3, Z = 2. The crystal of (2) is monoclinic: space group P21/n, a = 7.2682(4), b = 20.195(1), c = 10.8447(6) A˚, β = 106.420(2)°, V = 1526.9(2) A˚3, Z = 4. The Cu atoms in the copper complex are in square pyramidal coordination. The Zn atom in the zinc complex is in tetrahedral coordination. The effect of the complexes on the antimicrobial activity against Staphylococcus aureus, Escherichia coli, and Candida albicans were studied. Copyright © Taylor & Francis Group, LLC. Source

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