Process integration and exergy analysis of the autothermal reforming of glycerol using supercritical water

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

doi:10.1016/j.energy.2012.03.069

Cited by 29 publications

(5 citation statements)

References 18 publications

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“…A higher acetone content will increase the conversion of glycerol [24,70]. However, an increase of the acetone to glycerol ratio will increase the exergy destruction rate due to a reduction in the rate of formation toward the product and a higher consumption of electrical exergy to the acetalization reactor [20,[71][72][73][74][75][76][77][78][79][80].…”

Section: Perspective On Ketalization Of Glycerol Over Hierarchical Zementioning

confidence: 99%

Glycerol to Solketal for Fuel Additive: Recent Progress in Heterogeneous Catalysts

et al. 2019

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Biodiesel has been successfully commercialized in numerous countries. Glycerol, as a byproduct in biodiesel production plant, has been explored recently for fuel additive production. One of the most prospective fuel additives is solketal, which is produced from glycerol and acetone via an acetalization reaction. This manuscript reviewed recent progress on heterogeneous catalysts used in the exploratory stage of glycerol conversion to solketal. The effects of acidity strength, hydrophobicity, confinement effect, and others are discussed to find the most critical parameters to design better catalysts for solketal production. Among the heterogeneous catalysts, resins, hierarchical zeolites, mesoporous silica materials, and clays have been explored as effective catalysts for acetalization of glycerol. Challenges with each popular catalytic material are elaborated. Future works on glycerol to solketal will be improved by considering the stability of the catalysts in the presence of water as a byproduct. The presence of water and salt in the feed is certainly destructive to the activity and the stability of the catalysts.

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Section: Perspective On Ketalization Of Glycerol Over Hierarchical Zementioning

confidence: 99%

Glycerol to Solketal for Fuel Additive: Recent Progress in Heterogeneous Catalysts

et al. 2019

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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%

“…In the optimization, an energy and exergy analysis was also carried out to complete the process assessment. Table shows some terms of the exergy analysis carried out, especially about the PEMFC, but more details of the exergy analysis used to assess the process can be found elsewhere …”

Section: Procedures Of Optimizationmentioning

confidence: 99%

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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“…Most of the cases, the higher the concentrations of co-reactants, the higher yield of the products in glycerol valorization (Marimuthu et al, 2018; Chen et al, 2019). Unfortunately, the higher ratio on co-reactant to glycerol, the higher the exergy destruction rate (Gutiérrez Ortiz et al, 2012a,b; Hajjaji et al, 2014; Antonova et al, 2015; Aghbashlo et al, 2018a,b, 2019; Gholami et al, 2018; Presciutti et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Peculiarities of Glycerol Conversion to Chemicals Over Zeolite-Based Catalysts

Muraza

2019

Front. Chem.

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Many countries have opted to produce biodiesel from vegetable oils for energy security and climate change concerns. Consequently, the availability of abundant glycerol, as a by-product in biodiesel production, is more obvious. Many institutions and companies have explored different routes to convert glycerol to highly-added chemical products and fuel additives. As the addition of the second reactant to glycerol may end up with worse exergy calculation, the conversion of glycerol over solid acid catalysts without the addition of the second reactant is preferred in this mini-review. Glycerol aromatization and glycerol dehydration over zeolite catalysts were focused with an emphasis on recent papers in the past 3 years. The role of acidity, hydrophilicity-hydrophobicity, zeolite frameworks are highlighted. The presence of water in the glycerol feed affected the stability of the catalysts. Low cost and naturally abundant zeolite and minerals are proposed. Numerous low-cost catalysts such as natural zeolites and natural clays are potentially used for this purpose.

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Process integration and exergy analysis of the autothermal reforming of glycerol using supercritical water

Cited by 29 publications

References 18 publications

Glycerol to Solketal for Fuel Additive: Recent Progress in Heterogeneous Catalysts

Glycerol to Solketal for Fuel Additive: Recent Progress in Heterogeneous Catalysts

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

Peculiarities of Glycerol Conversion to Chemicals Over Zeolite-Based Catalysts

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