Peiyang Chemical Equipment Co.

Tianjin, China

Peiyang Chemical Equipment Co.

Tianjin, China

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Yang Z.,Tianjin University | Cui X.,Tianjin University | Yu X.,Peiyang Chemical Equipment Co. | Zhang Y.,Tianjin University | And 3 more authors.
Catalysis Letters | Year: 2015

Several acidic ionic liquids (ILs) with different cations and anions were used as catalysts in the transesterification of methyl acetate with n-butanol. The IL [omim][PF6] can enhance the catalytic activity of the partially soluble IL catalyst. The kinetics for the transesterification using the catalysts [HSO3bmim][p-TS] and [HSO3bmim][OTF] were measured. The ideal homogeneous model and the nonideal homogeneous (NIH) model were used to correlate the kinetic data. The NIH model was more reliable to describe the reaction rate. (Graph Presented). © 2015 Springer Science+Business Media.


He J.,Tianjin University | Han S.-Q.,Tianjin University | Ding H.,Peiyang Chemical Equipment Co. | He L.,Peiyang Chemical Equipment Co. | Zhang X.-M.,Tianjin University
Huaxue Gongcheng/Chemical Engineering (China) | Year: 2015

A number of solvents for separation of cyclohexane and cyclohexene by extractive distillation were examined in a vapor-liquid equilibrium (VLE) experiment apparatus. The result shows that dimethyl sulfoxide (DMSO) is the best solvent for separation of cyclohexane and cyclohexene among all single solvents. Solvent with good selectivity always has low solubility, but the actual separation performance is determined by both solubility and selectivity. Single solvent and mix solvents were tested in an extractive distillation experiment apparatus. It shows that N, N-dimethyl formamide (DMF) and dimethyl sulfoxide (DMSO) mixed solvents present the best actual separation performance. ©, 2015, Editorial Office of Chemical Engineering (China). All right reserved.


Qie S.-Y.,Tianjin University | Gao F.,Tianjin University | Yu X.-F.,Tianjin University | Yu X.-F.,Peiyang Chemical Equipment Co. | Liu C.-J.,Tianjin University
Huaxue Gongcheng/Chemical Engineering (China) | Year: 2015

A 2-D airlift loop reactor (2-D ALR) was developed. The hydrodynamics in 2-D ALR with different baffles was investigated with two phases (air and water). PIV experiment was carried out to investigate the hydrodynamics of the 2-D ALR with different draft tubes. Then 2-D and 3-D simulations were carried out by CFD method to study the flow behavior in the experiment. It shows that the area ratio of riser/downcomer influences the hydrodynamics in ALRs. The liquid velocity in downcomer increases with the increasing of draft tube diameter, whereas the liquid circulation flow rate reaches the maximum when the sectional area of the risers is equal to that of the downcomer. The result reveals a satisfactory agreement between the 2-D simulation and the experiment. Furthermore, the results of 3-D simulation indicate that the key factor of deciding liquid circulation flow rate is area ratio of riser/downcomer rather than diameter ratio. ©, 2015, Editorial Office of Chemical Engineering (China). All right reserved.


He J.,Tianjin University | Wang X.,Tianjin University | Yu X.-F.,Peiyang Chemical Equipment Co. | Liu H.-Q.,Tianjin University | Tian J.,Peiyang Chemical Equipment Co.
Huaxue Gongcheng/Chemical Engineering (China) | Year: 2015

Using the air-water system in a 1 500 mm×400 mm rectangular column, the hydrodynamic performances of a newly-developed low entrainment directed-trapezoidal fixed valve tray were studied. The pressure drop, entrainment and weeping were obtained by changing the gas velocity, liquid weir load and weir height. The experimental results show that the low entrainment directed-trapezoidal fixed valve tray is with lower pressure drop and entrainment, a little higher weeping. By contrast in whole, the low entrainment directed-trapezoidal fixed valve tray is better than F1 valve tray, with a good integrated performance; compared to the half-ellipse fixed valve, the entrainment is lower, the pressure drop is a bit higher and the weeping is similar, the performance is good in general. According to the experimental data the correlative equation was obtained for calculating pressure drop, weeping and entrainment rate. The results can be used in engineering design. ©, 2015, Editorial Office of Chemical Engineering (China). All right reserved.


Yang Z.,Tianjin University | Cui X.,Tianjin University | Jie H.,Tianjin University | Yu X.,Peiyang Chemical Equipment Company | And 4 more authors.
Industrial and Engineering Chemistry Research | Year: 2015

The reaction kinetics and chemical equilibrium of the transesterification of methyl acetate and isoamyl alcohol catalyzed by 1-sulfobutyl-3-methylimidazolium hydrogen sulfate ([HSO3bmim][HSO4]) were investigated. The effects of reaction temperature, initial reactant molar ratio, and catalyst concentration on the kinetics were studied. Two kinetic models, the ideal homogeneous (IH) model and the nonideal homogeneous (NIH) model, were used to correlate the kinetic data. The NIH model was more reliable to describe the reaction rate. The residue curve maps of the reaction system at different mole fractions of IL catalyst were computed, and according to the analysis of residue curve maps, a reactive distillation process was proposed. E ffects of operational and structural parameters of reactive distillation column were investigated. An experiment of the reactive distillation in a lab-scale column was then conducted to validate the simulation results. © 2015 American Chemical Society.


Sun B.,Tianjin University | He L.,Peiyang Chemical Equipment Co. | Liu B.T.,Tianjin University | Gu F.,Tianjin Internal Combustion Engine Research Institute | Liu C.J.,Tianjin University
AIChE Journal | Year: 2013

A multi-scale approach with the combination of computational fluid dynamic (CFD) and macroscopic calculation methods has been proposed to predict the hydrodynamics behavior in the corrugated structured packing column. On the basis of the concept of the representative unit, the three-dimensional (3-D) volume of fluid (VOF) model of the structured packing is applied in the small scale simulation, and the stream split fraction coefficients and effective wetted area ratio are calculated. The unit network model, which is a mechanistic model, is applied in large scale calculation basing on the small scale results. The liquid holdup distribution in the entire column can be available by this multi-scale method. A comparison between the simulation results and the experimental data of our previous work is given to validate the present model. The multi-scale model is proved to be prospective to assist the analysis and design of structure packing columns in chemical engineering. © 2013 American Institute of Chemical Engineers.


Zheng J.,Tianjin University | Su G.-L.,Tianjin University | Huang G.-Q.,Tianjin University | Wang G.-F.,Peiyang Chemical Equipment Co. | Pan J.-H.,Peiyang Chemical Equipment Co.
Xiandai Huagong/Modern Chemical Industry | Year: 2014

A general introduction of the background and status of polysilicon production is performed. The preparation of trichlorosilane by disproportionation method and hydrogenation of silicon tetrachloride which mainly includes thermal hydrogenation, catalytic hydrogenation, low-temperature-hydrogenation, hydrochlorination, and plasma hydrogenation, is reviewed. The new catalytic hydrogenation technology is highlighted. Practical applications of these methods are also introduced. Through comprehensive classification and discussion, the advantages and disadvantages of the methods are summarized. The prospect of each method in the application is proposed as well. ©, 2014, China National Chemical Information Center. All right reserved.


Zhang X.,Tianjin University | Liu H.,Tianjin University | Yang W.,Tianjin University | Jian C.,Peiyang Chemical Equipment Co. | Miao Y.,China offshore Oil Engineering Co.
Fluid Phase Equilibria | Year: 2016

Isobaric vapor-liquid equilibrium (VLE) data for the quaternary system sec-butyl alcohol + sec-butyl acetate + N, N-dimethyl formamide (DMF) + dimethyl sulfoxide (DMSO) and the constituent binary system DMF + DMSO were determined at 101.3 kPa with a modified Othmer still. The measured experimental data of binary and quaternary systems were certified to be thermodynamically consistent according to the Van Ness method. And the experimental binary data were correlated by Wilson, NRTL and UNIQUAC activity coefficient models. The rest of binary interaction parameters have been obtained in our previous work. Then, the binary and quaternary vapor-liquid equilibrium were predicted by the models with the correlated parameters. The results show that the three models yield a good prediction for the binary and quaternary systems. But NRTL model performed better than the other two models in predicting VLE of the quaternary system. © 2015 Elsevier B.V..


Lin R.,Tianjin University | Cui X.,Tianjin University | Yu X.,Peiyang Chemical Equipment Co. | Zhang Y.,Tianjin University | And 4 more authors.
Fluid Phase Equilibria | Year: 2016

Acetic acid and N,N-dimethylacetamide (DMAC) form a binary maximum boiling azeotrope, and the azeotrope can be separated by extractive distillation. In this work, 1-butyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]-imide ([BMIM][Tf2N]) was selected as solvent to separate the azeotrope, and isobaric vapor-liquid equilibrium (VLE) data of the system acetic acid + DMAC + [BMIM][Tf2N] were determined at 7.0 kPa and 12.0 kPa. The non-ideal behavior in vapor phase was caused by the associating effect of acetic acid and calculated by chemical theory and Hayden-O'Connell equation. The experimental VLE data were correlated by the nonrandom two-liquid (NRTL) activity coefficient model and the correlated results agreed well with the experimental data. The results show that ionic liquid [BMIM][Tf2N] produces a notable salting-out effect in the azeotropic mixture, which enhances the relative volatility of acetic acid to N,N-dimethylacetamide. © 2015 Elsevier B.V.

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