58 Accession number: 20134416916456
Salih, Alsamani A. M.1 ; Yi, Chun Hai1 ; Yang, Bo Lun1 ; Chen, Peng1
Interfacially polymerized composite hollow fiber membrane for CO2 separation
Advanced Materials Research,2013, 781-784,pp2040-2046
PEAm-TMC/PDMS/PVC composite hollow fiber membrane for CO2 separation was developed through interfacial polymerization (IP) on the PDMS pre-coated inner surface of PVC hollow fiber. Polyetheramine (PEAm) and Trimesoyl chloride (TMC) were selected as aqueous monomer and organic monomer, respectively. SEM observation result shows that the thickness of PEAm-TMC IP layer is about 215 nm. The effects of monomer concentrations and acid acceptor concentration on the membrane performance were investigated. The results shows that the CO2 permeance decareses and CO2/N2 selectivity increases with the increasing concentrations of PEAm, TMC and Na2CO3. At 0. 12 MPa, the composite hollow fiber membrane possesses a very high CO2 permeance of 964 GPU and CO2/N2 selectivity of 40.6. © (2013) Trans Tech Publications, Switzerland.
57 Accession number: 20132916509728
Numerical simulation of the multi-component slurry gasification with the non-premixed combustion model
Advanced Materials Research, 2013,704, 326-331
Department of Chemical Engineering, State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an Shaanxi 710049, China
Considering the volumetric reactions and particle surface reactions in an entrained flow gasifier, the non-premixed combustion model based on the wet particles combustion method is adopted to simulate the multi-component slurry gasification process with FLUENT software. The velocity, temperature and concentration profiles of the gas products in the gasifier are obtained. Simulated results agree well with the commercial data, which verified the validity and applicability of the present model. Simultaneously, the reaction subarea inthe gasifier has turned out to be obvious, the water evaporation, volatiles cracking and combustion reactions mainly appear in the jet region of the gasifier, the char gasification mainly appear in the freeboard region, but few reactions appear in the recirculation region. Moreover, with the increase of the mass fraction of the multi-component slurry, the content of the syngas at the gasifier outlet increases, while with the oxygen carbon atom ratio increasing, the syngas yield is rising early but declining later. © (2013) Trans Tech Publications, Switzerland.
56. Accession numbe 20130215895952
JIANG Xuedong，QIU Peng，ZHANG Hailiang，YANG Bolun
Multi-Field Synergy Analysis of Reaction-Absorption Coupling Process and Numerical Simulation for Ethylene Carbonate Synthesis
Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University, 2012,46(12): 92-97
To improve the productivity of ethylene carbonate from the esterification of urea and ethylene glycol, the synthesis process is enhanced by removing by-product ammonia via bubbling in phosphoric acid solution. Multi-field synergy principle is employed to analyze the chemical absorption process, then numerical simulation is carried out for absorption of single ammonia bubble with the volume of fluid model. The results show that the chemical absorption of ammonia, which controlled by convective mass transfer, is essentially affected by the synergy of velocity and pressure gradient fields. The synergy is measured with mass transfer field synergy number, which is determined by scalar quantities of the two vector fields, and mostly, by their included angle. While the angle gets zero, the field synergy number reaches to the maximum, which leads to a larger mass transfer coefficient. During the bubbling absorption process, ammonia current inside the bubble facilitates forming tiny vortexes to give rise to the optimized ammonia velocity field and to optimize the synergy with pressure gradient field at gas-liquid interface, thus the field synergy number is maximized and the mass transfer efficiency of ammonia is consequently heightened.
60. Accession number: 201446210836
Kinetics study on the ozonation process of Ce3+
PanYanbo;LiuJingjun; HuangZhiyu; Li Xingxing; YangBolun
Journal of Chemical Engineering of Chinese Universities
2014, 5: pp998-1003
Abstract:
The aim of this work is to study the mechanism of ozonation process of Ce3+. The reaction between ozone and Ce3+was investigated in a bubbled column reactor. Effects of temperature, the concentration of nitric acid and initial Ce3+ concentration on the final concentration of Ce4+ were investigated. The volume transfer coefficient, liquid mass transfer coefficient and some other relevant mass transfer parameters were estimated. The Hatta number of the reaction is between 0.079 and 0.091, which indicates that the reaction occurs in bulk liquid, corresponding to a slow kinetic regime. When excess nitric acid is used, the reaction rate is related to ozone concentration in liquid phase and Ce3+ concentration. The reaction kinetics can be determined to be a second order. The parameters for reaction kinetics model were obtained by fitting with experimental data. The direct oxidation rate constant k can be correlated by a Arrhenius Equation with an expression:k=733585.9exp(-39257.1/RT). At the temperature and in the range of nitrate concentration investigated, the calculated results agreed well with the experimental results.
59, Accession number:20134717003514
Hao, Miao Li1 ; Li, Ying Ming1 ; Zhang, Ying1 ; Lan, Xiao Rong1 ; Guan, Yu Lei1 ; Yang, Bo Lun
Quantum chemical calculations on binding energy of alkyl substituted crown ethers with Sr2+
Applied Mechanics and Materials
2013,448-453,pp139-144
Structures of Dibenzo-18-crown-6(DB18C6), Di-methyl-dibenzo-18-crown-6(DMB18C6), Di-tert-butyl-dibenzo-18-crown-6(DTBB18C6), Di-tert-amyl-dibenzo-18-crown-6(DTAB1C6) and their complexes with strontium ion were optimized based upon DFT at B3LYP using 3-21G basis. The binding energy of crown ethers with Sr2+ was calculated according to the energy of optimal structures. The complex strength increased gradually from DB18C6 to DTAB18C6, which could be related to the changes of cavity size of crown ethers and electron density on the crown rings. Addition and extension of alkyl groups on DB18C6 could enhance the combination between crown and Sr2+. © (2014) Trans Tech Publications, Switzerland.
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