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Guo B.,Tianjin University | Li Y.,Tianjin University | Li Y.,National Engineering Research Center for Distillation Technology
Chemical Engineering Science | Year: 2012

The increasingly stringent regulations on sulfur content in fuel require refineries to develop new desulfurization processes. Through the alkylation of thiophene and its derivatives with olefins followed by distillation, alkylation desulfurization is an alternative technology in the case of gasoline for its mild operation conditions and low loss of octane number. In this paper, the application of reactive distillation in gasoline alkylation desulfurization is studied, including a conceptual design and a rigorous steady state simulation. The conceptual design considers three aspects: thermodynamic analysis of the reactive system, benefits and constraints of the reactive distillation, and computation of the reactive residue curve maps. Results show that reactive distillation is feasible for gasoline alkylation desulfurization, and it has no constraints but great potential for its capital savings, improved conversion, reduced by-product formation, improved catalyst stability and avoidance of hot spots. The simulation results show that reactive distillation could obtain product gasoline with sulfur content less than 1. ppmw. It is shown that reactive distillation may be considered a viable technological alternative for gasoline alkylation desulfurization. © 2012 Elsevier Ltd. Source


Guo B.,Tianjin University | Wang R.,Tianjin University | Li Y.,Tianjin University | Li Y.,National Engineering Research Center for Distillation Technology
Fuel | Year: 2011

Gasoline desulfurization is receiving attention worldwide due to the increasing stringent regulations on sulfur content for environmental protection purpose. As conventional hydrotreating technology leads to significant octane number loss and processing costs, the gasoline alkylation desulfurization process, which consists of weighing down the sulfuric compounds by catalytic alkylation with olefins present in the feed and distillation followed by, is a rather attractive way. In this paper, firstly alkylation of thiophenic compounds was researched over macroporous sulfonic resin Amberlyst 35 in methanol presence to increase the selectivity of catalyst, then kinetics of thiophenic sulfurs alkylation in FCC gasoline was researched without and with methanol. Results found that appropriate methanol (≤2 wt.% methanol in model gasoline and ≤1 wt.% methanol in FCC gasoline) could inhibit olefins oligomerization significantly without influence on the conversions of thiophenic compounds. The alkylation of thiophenic sulfurs could be described as pseudo first order reaction regardless of the existence of methanol. The introduction of methanol decreases the reaction rate constant and increases the activation energy of alkylation reactions. © 2010 Elsevier Ltd. All rights reserved. Source


Li X.,Tianjin University of Technology | Li Y.,Tianjin University of Technology | Li Y.,National Engineering Research Center for Distillation Technology
Catalysis Letters | Year: 2014

A novel type of Ce-Mo-Oxcatalyst prepared by the facile coprecipitation method has been utilized for the selective catalytic reduction of NO with NH3. The catalyst showed excellent activity, prominent resistant to the space velocity in a temperature range from 200 to 400°C and exhibited high SO2/H2O durability at 300°C. XRD and in situ DRIFTS proved that the strong interactions between CeOx and MoOx in the catalyst could be the main reason for the excellent NH3-SCR catalytic performance. © 2013 Springer Science+Business Media New York. Source


Li X.,Tianjin University of Technology | Li Y.,Tianjin University of Technology | Li Y.,National Engineering Research Center for Distillation Technology
Journal of Molecular Catalysis A: Chemical | Year: 2014

A series of MoO3 doped CeAlOx mixed oxide catalysts with different Mo/Al molar ratios were prepared by the simple coprecipitation method and used for selective catalytic reduction of NO with NH3. The Ce-Mo-AlOx catalyst with the Mo/Al molar ratio of 0.5 exhibited excellent activity and high H2O or/and SO2 poisoning resistance at 250 C. XRD revealed that the molybdenum oxide existed in either highly dispersed or amorphous phases on the catalyst surface. BET analysis results showed that the total pore volume and the average pore diameter of the CeAlOx catalyst was improved by the addition of MoO3. As determined by the H2-TPR and NH3-TPD, the redox capacity and total acidity of the CeAlOx catalyst were also enhanced by the introduction of MoO3, which are critical for the NH3-SCR reaction. The SCR reaction mechanism was also studied by the in situ DRIFTS, the coordinated NH3 and ionic NH4 + species together with the monodentate and bidentate nitrate were active intermediates on the CeMo0.5AlOx catalyst surface during the NH 3-SCR reaction. © 2014 Elsevier B.V. Source


Guo B.,Key Laboratory for Green Chemical Technology of State Education Ministry | Bai J.,Key Laboratory for Green Chemical Technology of State Education Ministry | Li Y.,Key Laboratory for Green Chemical Technology of State Education Ministry | Li Y.,National Engineering Research Center for Distillation Technology | And 2 more authors.
Fluid Phase Equilibria | Year: 2012

Isobaric vapor-liquid equilibrium (VLE) data for the systems of 3-methylthiophene with four compounds (2,3-dimethyl-2-butene, n-heptane, toluene and 2-methylbutane) were measured at 101.33. kPa with a modified Rose-Williams still. Gas chromatography was used to analyze compositions of the samples from the vapor-liquid equilibrium systems. All the VLE measurements passed the thermodynamic consistency test proposed by Herington and showed positive deviations from Raoult's law. The experimental data of binary systems were correlated by Wilson model for the liquid phase and also compared with original UNIFAC and UNIFAC-Dortmund predictive models. Results showed that the original UNIFAC model gave better predictions than the UNIFAC-Dortmund model. © 2012 Elsevier B.V. Source

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