Thermodynamic analysis of the autothermal reforming of glycerol using supercritical water

Ortiz, F.J. Gutiérrez; Ollero, P.; Serrera, A.

doi:10.1016/j.ijhydene.2011.07.003

Cited by 32 publications

(5 citation statements)

References 28 publications

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“…Supercritical water (SCW) has many advantageous properties and is extremely reactive, − and it may allow for the performance of a catalyst-free process, because of its relevant thermophysical properties, such as a high capability to solubilize gaseous organic molecules and high reactivity, among others. As the processes above cited, autothermal reforming makes it possible to save on energy required for heating the reactor. − Therefore, autothermal reforming using SCW may be an excellent method, but while studies on the autothermal reforming of glycerol can be found in the literature, there are few published papers on glycerol reforming using SCW and none on autothermal reforming of glycerol using SCW, except our previous papers. , …”

Section: Introductionmentioning

confidence: 93%

“…The computation has been made with the aid of AspenPlus, version 2006.5 (Aspen Technology, Inc., Burlington, MA). The used thermodynamic method has been the predictive Soave–Redlich–Kwong (PSRK), as the most suitable . Two feeds have been studied: pure and pretreated crude glycerol.…”

Section: Process Design and Simulationmentioning

confidence: 99%

“…Likewise, the water/glycerol mole ratio (W/G) was changed to identify the optimal operating conditions by a sensitivity analysis. On the other hand, the pressure did not significantly affect the process in the range from 200 to 300 atm. ,, and is not included in the analysis, and a fixed value of 240 atm was chosen because it is suitable to have a margin over the critical pressure (218 atm), thus accounting for pressure drops in the equipment and through the pipes. The process was assessed using a mass flow rate of glycerol (pure or pretreated crude) fed into the system of 1000 kg/h, and thus, the W/G mole ratio is obtained by adding more or less water.…”

Section: Procedures Of Optimizationmentioning

confidence: 99%

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Autothermal Reforming of Glycerol with Supercritical Water for Maximum Power through a Turbine Plus a Fuel Cell

et al. 2012

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An autothermal reforming of glycerol process using supercritical water was proposed to produce maximum power by means of a turbine, from the huge pressure energy of product gas just at the outlet of the reformer, and a proton exchange membrane (PEM) fuel cell, which is fed by a hydrogen-rich stream. The reformate gas is upgraded to hydrogen using serially two water−gas shift reactors and a pressure swing adsorption unit. To achieve the energy self-sufficiency condition, all of the pressure swing adsorption (PSA) off-gas, which mainly consists of methane and non-recovered hydrogen, is used as fuel gas to provide a fraction of the thermal energy required by the overall process, and thus, the oxygen needed within the supercritical autothermal reformer is reduced. The system analysis was performed by simulation using AspenPlus, and simulation results are presented. Different reforming and preheating temperatures were taken, and the best values of both water/glycerol and oxygen/glycerol mole ratios to maximize power production were identified. Thus, by reforming and preheating at 800 °C and 240 atm, a specific power of 1.60 kW/kg of glycerol with exergy and energy efficiencies of 33.5 and 36.0%, respectively, was obtained. In addition, a comparison with the use of glycerol as a fuel in a combined Brayton−Rankine cycle showed a lower overall energy efficiency.

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Section: Introductionmentioning

confidence: 93%

Section: Process Design and Simulationmentioning

confidence: 99%

Section: Procedures Of Optimizationmentioning

confidence: 99%

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Autothermal Reforming of Glycerol with Supercritical Water for Maximum Power through a Turbine Plus a Fuel Cell

et al. 2012

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“…Dehydration of glycerol at high temperature, particularly with acid catalyst, is well known to produce a wide range of products, from acrolein to syngas . The specific properties of water in the subcritical or supercritical phase such as ion dissociation allow this reaction to be performed under hydrothermal conditions, without catalyst.…”

Section: Reactions In Watermentioning

confidence: 99%

Glycerol in subcritical and supercritical solvents

Galy

Nguyen

Yalgin

et al. 2016

J of Chemical Tech & Biotech

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Glycerol conversion to added value chemicals is a research avenue that has attracted significant interest in recent years. The utilization of critical solvents such as water and organic solvents in critical conditions as well as subcritical conditions (or hot compressed solvent) and supercritical conditions can offer several advantages to batch processes and in continuous flow systems in view of their potential implementation in industry. This review has been aimed to highlight most recent key processes for glycerol valorization to valuable products using different types of catalysts and processes.

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“…Their studies also concluded that under optimal conditions, methane production is reduced to the minimum while coke formation is thermodynamically repressed. Several studies have been dedicated to understanding the thermodynamics of the ATR process of glycerol using Gibbs free minimization technique [11][12][13]. In a similar study, Authayanun et al [14] carried out a thermodynamic study of crude glycerol ATR under atmospheric pressure using HYSYS software to investigate the effect of major operating parameters on the reformer performance.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Analysis of Autothermal Reforming of Synthetic Crude Glycerol (SCG) for Hydrogen Production

Jimmy¹,

Mohamedali²,

Ibrahim³

2017

ChemEngineering

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This study presents the thermodynamic modelling of hydrogen production from autothermal reforming of synthetic crude glycerol using the Peng-Robinson Stryjek-Vera thermodynamic model and Gibbs free energy minimization approach. In order to simulate the typical crude glycerol, a solution was prepared by mixing glycerol, methanol, soap, and fatty acids. The equilibrium compositions of the reforming gas were obtained and the impacts of the operating temperature, steam to crude glycerol ratio (S/SCG), and oxygen to crude glycerol ratio (O/SCG) on hydrogen production were investigated. Under isothermal conditions, the result showed that maximum hydrogen production is favoured at conditions of high temperatures, high S/SCG, and low O/SCG ratio. However, under thermoneutral conditions where no external heat is supplied to the reformer, results indicate that high hydrogen yield is realised at conditions of high temperatures, high S/SCG and high O/SCG ratio. Furthermore, it was concluded that under thermoneutral condition, steam to SCG ratio of 3.6, oxygen to SCG ratio of 0.75, and adiabatic temperature of 927 K yields maximum hydrogen.

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Thermodynamic analysis of the autothermal reforming of glycerol using supercritical water

Cited by 32 publications

References 28 publications

Autothermal Reforming of Glycerol with Supercritical Water for Maximum Power through a Turbine Plus a Fuel Cell

Autothermal Reforming of Glycerol with Supercritical Water for Maximum Power through a Turbine Plus a Fuel Cell

Glycerol in subcritical and supercritical solvents

Thermodynamic Analysis of Autothermal Reforming of Synthetic Crude Glycerol (SCG) for Hydrogen Production

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