Publications (Cited by EI)

发布者: 杨伯伦 | 2008-06-29
39Accession number:064910289699
Analysis of the thermodynamic stability for the W/O microemulsion based on the phase diagram method
Abstract: W/O microemulsion was prepared by using different surfactants separately with certain cosurfactant (pentanol, hexanol or heptanol) respectively. The thermodynamic stability of the microemulsion was inspected by phase diagram method, the radius of the microemulsion droplets were calculated and the W/O zone of the emulsions was confirmed. The results show that the microemulsion could be formed spontaneously in the experimental conditions, the radius of the water droplets are in the range of 2 nm to 4 nm and it is suitable to be used as the nanoreactors to prepare nanoparticles. When TX-10 is used as surfactant, the biggest W/O zone is formed and while the surfactant CTAB is used, the smallest W/O zone is formed due to the strong repulsive actions between its polar parts. When lanthanum nitrate solution is used instead of water as dispersed phase, the W/O zone of the emulsion is almost unchanged and when the temperature is increased, the W/O zone of the microemulsions becomes smaller.
38Accession number063210056136
Study on the partial oxidation process of methane in liquid phase catalyzed by V2O5
Source: Journal of Chemical Engineering of Chinese Universities2006203417-421
Abstract:  The partial oxidation of methane catalyzed by V2O5 in oleum was studied. The effects of concentration of V2O5, reaction temperature, residence time and concentration of oleum on the conversion of methane and the yield of methanol were investigated. The mechanism of V2O5 catalytic cycle for methane partial oxidation in oleum was discussed and the macro-kinetic model was deduced. It is found that the methane is transformed firstly into methyl bisulfate and the methyl bisulfate is then hydrolyzed to form the methanol. The maximum methanol yield of 45.5% and the methane conversion of 54.5% can be obtained when the content of sulfur trioxide in oleum is about 50% and the concentration of V2O5 0.0175 mol, reaction temperature 180°C, pressure of methane 4.0 MPa and reaction time 2 h are used. The macro-kinetic model shows that the process of methane partial oxidation catalyzed by V2O5 follows the electrophilic alternative mechanisms and the methane oxidation reaction is a first-order reaction.
37Accession number06219898239
A novel routine for manufacture of environmentally friendly ethanol fuel via reactive distillation
Wu, Jiang Yang, Bo-Lun; Wang, Hua-Jun; Lu, Shi-Qing
(Department of Chemical Engineering, Xi’an Jiaotong University);
Source: Guocheng Gongcheng Xuebao/The Chinese Journal of Process Engineering, v 6, n 2, April, 2006, p 237-241
Publisher: Science Press
Abstract: A novel routine for removing water from ethanol by the hydration using C4 olefin cut catalyzed with the ion exchange resin was proposed. Reactive distillation experiments were carried out to demonstrate the feasibility of this routine. The sensitivity analysis was performed by using the software of ASPEN PLUS 10.2. The optimized operating conditions were obtained considering three objective functions which were the water content of the bottom product, water conversion rate and hydration selectivity. Under the optimized operation conditions, the final product was consisted of 45.0% of ethanol, 19.4% of ethyl tert-butyl ether, 35.1% of tert-butyl alcohol and 0.6% of water in volumetric percentage.
(15 refs.)
36.Accession number06209882192
Process analysis of methane simultaneous oxidative conversion to syngas based on symbiosis theory
Hsi-An Chiao Tung Ta Hsueh/Journal of Xi’an Jiaotong University2006403):324-327
The coupling process of CH4, CO2, O2 simultaneous oxidative conversion to produce syngas was analyzed based on the symbiosis theory to determine the optimum operating parameters of optimization. Regarded CO and H2 as the primary quality parameters, the characteristic symbiotical degree expression of the symbiosis system was obtained via the analysis of the thermodynamics and kinetics for representative reactions, such as partial oxidation of methane, carbon dioxide reforming and steam reforming. Taken the relative content of CO2 in the feed as the adjusting parameter and the n(H)/n(C) in syngas as the objective function, the corresponding relationship was established by the compatibility principle of the parameters and the symbiotical degree relation under steady condition. The analysis results indicate that with the change of relative content of CO2 in the feed, the n(H)/n(C) in the syngas product and energy consumption of the system can be adjusted within an appropriate range, and the optimized feed of CO2 leads to a desired system with symbiosis stability and the least energy consumption
35Accession number06109752531
Source: International Biodeterioration and Biodegradation, v 57, n 2, March, 2006, p 93-98
Publisher: Elsevier Ltd

Abstract: A type of bioreactor packed with granular activated carbon (GAC) as support material was used for the removal of high concentrations of H2S in waste gases. Experiments about the physical adsorption capacity of GAC matrix, retention time and pressure drop were carried out; the abilities of bioreactor to buffer shock loading and removal efficiency (RE) of long-term operation were also investigated. Besides, the kinetics analysis of single-stage biodesulfuration was also studied. The results showed that GAC matrix provided high bacteria adsorption capacity, showed a superior resistance to shock loading and allowed good operational control in area of pressure drop. When the retention time was 25 s and influent concentration of H2S was 100 mg L-1, the REs were beyond 98%. An average 96.8% RE was achieved during the long-term operation for GAC bioreactor under different concentrations up to 120 mg L-1 by keeping constant flow rate. No acidification was observed in the GAC bioreactor during the long-term operation. The kinetic analysis showed that the maximum removal rate and the saturation constant in the GAC bioreactor were 666.7 mg(H2S) (L d)-1 and 20.8 mg L-1, respectively. The response of bioreactor to shock loading operation showed that GAC bioreactor has gotten a good buffering capacity to withstand fluctuating loading conditions. © 2006 Elsevier Ltd. All rights reserved.
(24 refs.)
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