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Shanghai, China

Yang Z.-W.,Yankuang Energy R and D Co. | Sun Q.-W.,Yankuang Energy R and D Co. | Zhang Z.-S.,Yankuang Energy R and D Co.
Huaxue Gongcheng/Chemical Engineering (China) | Year: 2014

According to the complicated characteristic of reaction water from high-temperature Fischer-Tropsch synthesis, the continuous distillation was used to deal with the primary separation for reaction water so as to remove carboxylic acids and most water. Simultaneously, the non acidic organic compounds were condensed to make for the downstream product separation. The NRTL thermodynamic method was used to investigate the effect of theoretical stage number, feed stage number and reflux ratio on the separation effect so as to get the best operational parameter. Then a bench-scale distillation column was used to verify the simulation value. The result shows that the mass fraction of organic compounds at the top is more than 75%, carboxylic acid mass fraction is 0; the mass fraction of the non acidic organic compounds at the bottom is less than 0.01%. The best operational parameters are as follows: theoretical stage number is 35, feed stage number is 15, and reflux ratio is 4. The experimental value matches well with the simulation value. Source


Wu J.,Yankuang Energy R and D Co. | Sun Q.,Yankuang Energy R and D Co. | Zhang Z.,Yankuang Energy R and D Co. | Pang L.,Yankuang Energy R and D Co.
China Petroleum Processing and Petrochemical Technology | Year: 2013

The diffusion and reaction phenomenon in a Fe-based catalyst pellet for Fischer-Tropsch synthesis was studied. It was considered that the pores of catalyst pellets were full of liquid wax under Fischer-Tropsch synthesis conditions. The reactants diffused from the bulk gas phase to the external surface of the pellet, and then the reactants diffused through the wax inside the pellet and reacted on the internal surface formed along the pore passages of the pellet. On the basis of reaction kinetics and double α-ASF product distribution model, a diffusion and reaction model of catalyst pellet was established. The effects of diffusion and reaction interaction in a catalyst pellet, the bulk temperature, the reaction pressure and the pellet size on the reactivity were further investigated. The relationship between the internal diffusion effectiveness factor of spherical catalyst pellet and the Thiele modulus were also discussed. The bulk temperature and pellet size have significant effects on the reactivity, while the pressure shows only a slight influence on the reactivity. The internal diffusion effectiveness factor decreases with an increasing Thiele modulus. Source


Wu J.-M.,Yankuang Energy R and D Co. | Sun Q.-W.,Yankuang Energy R and D Co. | Zhang Z.-S.,Yankuang Energy R and D Co. | Pang L.-F.,Yankuang Energy R and D Co.
Journal of Molecular Catalysis | Year: 2013

The standard molar enthalpy of formation, the standard molar entropy and isobaric molar heat capacity of ethylene oligomerization products were estimated with Benson group contribution method. The reaction heat, Gibbs free energy change and equilibrium constant of ethylene oligomerization to α-olefin reaction system were calculated in detail as a function of the temperature from 298 K to 700 K. The thermodynamic equilibrium and the limit of different reaction steps were analyzed. The thermodynamic possibility and formation sequences of ethylene oligomerization reaction system were also judged. The effects of temperature and pressure on the equilibrium conversion were investigated. The appropriate process conditions of ethylene oligomerization to α-olefin reactions were determined according to thermodynamic calculations. The results show that ethylene oligomerization to α-olefin reactions are exothermic reactions, which are spontaneous when the temperature is lower than 546 K. The ethylene oligomerization to linear α-olefin reactions are easier than α-olefin isomerization and internal olefin disproportionations. Low temperature and high pressure are favored to ethylene oligomerizations to α-olefin reactions from the thermodynamic view point. The appropriate process conditions of ethylene oligomerization to α-olefins are 323~473 K, 5~20 MPa. The equilibrium conversions of ethylene oligomerization to linear α-olefin reactions approach 100% in the process conditions of 363 K, 10.3 MPa from SHOP method. Source


Wu J.-M.,Yankuang Energy R and D Co. | Sun Q.-W.,Yankuang Energy R and D Co. | Yue J.-P.,Yankuang Energy R and D Co. | Pang L.-F.,Yankuang Energy R and D Co.
Huaxue Gongcheng/Chemical Engineering (China) | Year: 2012

Based on the PRO/II simulation and optimization results of low temperature Fischer-Tropsch synthesis (FTS) system, the exergy thermodynamic analysis was applied to calculate the exergy distribution of Fischer-Tropsch synthesis system. The exergy efficiency and exergy losses of this system were also analyzed. The results show that FTS reaction process is the largest exergy loss process. The equipment with the maximum exergy loss is FTS reactor, with exergy efficiency 86.80%, sharing 85.15% of total exergy loss; the condensate backflow pump has the lowest exergy efficiency, which is only 6.71%; the exergy efficiencies of wax collection tank, wax pump and wax intermediate tank are the highest, which have no exergy loss nearly. By using exergy analysis method, it can be more accurate and convenient to uncover the process and devices with the maximal exergy loss, which can set up the target and provide suggestions for equipment improving and energy saving. Source


Wu J.-M.,Yankuang Energy R and D Co. | Sun Q.-W.,Yankuang Energy R and D Co. | Zhang Z.-S.,Yankuang Energy R and D Co. | Pang L.-F.,Yankuang Energy R and D Co. | Liu J.-S.,Yankuang Energy R and D Co.
Guocheng Gongcheng Xuebao/The Chinese Journal of Process Engineering | Year: 2013

The adsorption behaviors of CO, H2 and syngas over precipitated iron-based Fischer-Tropsch synthesis catalyst were studied by temperature programmed desorption (TPD) and in situ diffuse reflectance FT-IR spectroscopy under the conditions of 25~300°C and 0.1~2.5 MPa. CO-TPD showed that there were different adsorbed active sites over the iron-based catalyst and linear, twin and bridged CO.H2-TPD evidenced that there were two kinds of desorption peaks (strong and weak) over the catalyst. CO FT-IR demonstrated that clear double linear CO bands existed at 2170 and 2116 cm-1 and a few surface adsorption bands occurred at 1623~1313 cm-1. Characteristic adsorbed CO2 bands appeared with the temperature increasing at 2360 and 2319 cm-1. Meanwhile, the temperature and pressure had effects on CO adsorbed sites over the catalyst. Mechanisms of Fischer-Tropsch synthesis and oxygenate compound formation over the catalyst could be explained by the change of adsorbed species. In addition, increasing the temperature enhanced the CO hydrogenation, while high temperature and pressure favored the formation of C2 +-oxygenate compound at the reaction conditions. Source

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