Bin Chen

Northwest University, Ch’ang-an, Shaanxi, China

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Publications (4)15.91 Total impact

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    ABSTRACT: During pretreatment process for oil sample, charring and ashing processes of oil in AOCS Official Method Ca 12-55 were improved. Oil was pretreated with concentrated sulfuric acid and potassium hydroxide instead of zinc oxide. As a result, soluble phosphate was obtained in a short time, the subsequent steps were also simplified. Firstly, phosphorus contents were measured, then the equivalent phosphatide contents in oil samples were calculated, RSD (relative SD) was only 1.03%. According to the spiking experiments at low, middle and high concentration levels, recoveries were between 97.03 and 100.99%, RSD were all less than 1.57% (n = 5). The method was applied for determining the equivalent phosphatide content of different types of oils. Compared with AOCS Official Method Ca 12-55, the improved method can provide a more effective means for detecting and analyzing the phosphorus or the equivalent phosphatide content in vegetable oils.Practical applications: In theory, the applicable scope of the improved method should be consistent with that of AOCS Official Method Ca 12-55, that is, the method is also suitable for detecting phosphorus or the equivalent phosphatide content in crude, degummed and refined vegetable oils. However, the promotion of the method should be based on more experimental data from various vegetable oils.
    European Journal of Lipid Science and Technology 05/2014; 116(5). DOI:10.1002/ejlt.201300378 · 2.03 Impact Factor
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    ABSTRACT: The mechanisms of glycerol adsorption from biodiesel onto the sulfonated resins in both the hydrogen form (1180H) and sodium form (1180Na) were investigated. 1180H displayed higher adsorption capacity of glycerol in comparison to 1180Na. Parameters from the four isotherm models indicated that the adsorption process for 1180H was non-ideal, physical, and endothermic but exothermic for 1180Na. The values of Gibbs free energy change (ΔG0) and entropy change (ΔS0) suggested that the adsorption processes for both 1180H and 1180Na occurred spontaneously with an increase in randomness of the system. The isosteric heats of adsorption (ΔHX) for glycerol on both 1180H and 1180Na implied that interactions between the glycerol molecules and these modified resins were dominated by strong hydrogen bonding and that there existed an adsorbate–adsorbate mutual attractive interaction. The existence of hydrogen bonding was also confirmed by infrared spectra.
    Energy & Fuels 10/2012; 26(11):7060–7067. DOI:10.1021/ef3014426 · 2.73 Impact Factor
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    ABSTRACT: The adsorption isotherm data of glycerol from biodiesel (FAME, fatty acid alkyl esters) onto the sulfonated adsorbent were obtained via batch equilibrium tests at different temperatures in the range of 303–323 K. Subsequently, these data were fitted by four isotherm models. Freundlich isotherm model was the best fitted (r2 > 0.98), and the model parameter 1/n implied that the adsorption process was favorable. For the Dubinin–Radushkevich (D-R) isotherm model, the model parameter QD decreased with increasing temperature, and the mean free energy of sorption (E) was less than 8 kJ mol–1. The results of QD and E reflected the exothermic and physical properties of the adsorption process, respectively. The negative values of Gibbs free energy change (ΔG0) and enthalpy change (ΔH0) indicated that the adsorption occurs spontaneously with an exothermic nature, while the positive values of entropy change (ΔS0) suggested the increase in randomness at the solid–liquid interface during adsorption. The isosteric heat of adsorption (ΔHX) suggested that strong hydrogen bonding between glycerol and the −SO3– groups of the sulfonated adsorbent dominated the adsorption process and that there existed adsorbate–adsorbate mutual attractive interaction. Furthermore, the existence of hydrogen bonding was also confirmed by infrared spectra.
    Industrial & Engineering Chemistry Research 09/2012; 51(39):12933–12939. DOI:10.1021/ie301951p · 2.24 Impact Factor
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    ABSTRACT: Candida antarctica lipase was immobilized by an adsorption and cross-linking method with NW-ZT2 and by modification-coupled method with a silica-PEG gel. The final product silica-PEG-lipase was confirmed by IR spectra. The optimum pH value, the optimum temperature, the thermo-stabilities and operational stabilities for two kinds of immobilized lipase were also determined. Results show that the silica-PEG-lipase gel was superior to the lipase immobilized by adsorption and cross-linking, however both are viable for use in transesterification reactions.
    Biotechnology advances 09/2010; 28(5):644-50. DOI:10.1016/j.biotechadv.2010.05.014 · 8.91 Impact Factor