Estimation of Chemical Equilibria In High-Pressure Gaseous Systems by a Modified Redlich-Kwong-Soave Equation of State

Bertucco, Alberto; Barolo, Massimiliano; Soave, Giorgio

doi:10.1021/ie00048a030

Cited by 13 publications

(8 citation statements)

References 9 publications

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“…32 The parameters for the modified Soave-Redlich-Kwong equation of state were obtained from Bertucco and Soave. 31,33 Thermodynamic properties were obtained from the NIST-JANAF source. The equilibrium program calculates the yield (mol gas/ mol feed) of permanent gases (H 2 , CO, CO 2 , and CH 4 ); the yields of C 2 -C 3 compounds are neglected in this program as their values are considered to be very small; and it is only valid for glycerol experiments reported in this study.…”

Section: Terms and Definitionsmentioning

confidence: 99%

Catalytic and Non-catalytic Supercritical Water Gasification of Microalgae and Glycerol

Chakinala¹,

Brilman²,

Swaaij³

et al. 2010

Ind. Eng. Chem. Res.

261

140

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In this study, we present the gasification of microalgae (Chlorella Vulgaris) and glycerol in supercritical water (SCW) using batch (quartz capillaries) and continuous flow reactors. Preliminary tests of algae gasification were done with quartz capillaries at varying operating conditions such as temperature (400-700 °C), reaction time (1-15 min), and the addition of catalysts. The dry gas composition of uncatalyzed gasification of algae in SCW mainly comprised of CO 2 , CO, CH 4 , H 2 , and some C 2 -C 3 compounds. Higher temperatures, low algae concentrations, and longer residence times favored the algae gasification efficiency (GE). The addition of catalysts to the capillaries resulted in higher yields of hydrogen and lower CO yields via enhanced water-gas shift activity. The addition of catalysts accelerated the gasification efficiency up to a maximum of 84% at 600 °C and 2 min reaction time with nickel-based catalysts. Complete gasification is achieved at higher temperatures (700 °C) and with excess amounts of (Ru/TiO 2 ) catalyst. To elucidate part of the difficulties related to the SCWG of algae, reforming of a model compound (here glycerol) in SCW was carried out in a continuous flow reactor in the presence of additives like amino acids (L-alanine, glycine, and L-proline) and alkali salt (K 2 CO 3 ) and combinations thereof. The amino acids L-alanine and glycine have a minor effect on the gasification process of glycerol, and a significant reduction of the gasification efficiency was observed in the presence of L-proline. Coke formation and colorization of the reactor effluent were more noticeable with glycerol-amino acid mixtures. In the absence of amino acids, the glycerol solution gasified without any coke formation and colorization of the reactor effluent. Again this effect was more pronounced in the presence of L-proline. The addition of K 2 CO 3 enhanced the glycerol gasification efficiency and increased the hydrogen yields promoting the water-gas shift reaction.

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Section: Terms and Definitionsmentioning

confidence: 99%

Catalytic and Non-catalytic Supercritical Water Gasification of Microalgae and Glycerol

Chakinala¹,

Brilman²,

Swaaij³

et al. 2010

Ind. Eng. Chem. Res.

261

140

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“…Fugacity coefficients were calculated with the Modified Soave Redlich Kwong equation of state [12]. The parameters for the Modified Soave Redlich Kwong equation of state were obtained from Bertucco et al [13], Soave [14] and NIST-JANAF [15].…”

Section: Equilibrium Calculationsmentioning

confidence: 99%

Catalytic gasification of dry and wet biomass

Rossum¹,

Potic²,

Kersten³

et al. 2009

Catalysis Today

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“…37 The parameters for the modified Soave-Redlich-Kwong equation of state were obtained from Bertucco and Soave. 35,36 Thermodynamic properties were taken from a NIST-JANAF source. 38 In Figure 6, the cold-gas efficiency, and the individual contribution of the components to it, are plotted.…”

Section: Noncatalytic Gasification In Hot Compressed Watermentioning

confidence: 99%

“…Fugacity coefficients were calculated with the modified Soave−Redlich−Kwong equation of state . The parameters for the modified Soave−Redlich−Kwong equation of state were obtained from Bertucco and Soave. , Thermodynamic properties were taken from a NIST−JANAF source 5 Comparison between the measured and predicted chemical equilibrium product distribution: (a) 17 wt % glucose and (b) 1 wt % glucose.…”

Section: Noncatalytic Gasification In Hot Compressed Watermentioning

confidence: 99%

Gasification of Model Compounds and Wood in Hot Compressed Water

Kersten

Potic

Prins

et al. 2006

Ind. Eng. Chem. Res.

148

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In this paper, an experimental investigation is presented that concerns the gasification of glycerol, glucose, and pinewood in supercritical water. The batch experiments were performed in quartz capillary reactors with an internal diameter of only 1 mm. Because these quartz reactors are catalytically inert, the process could be studied in the absence of the interfering catalytic influence of a metal reactor wall, as used in all previous studies. The reaction space has been mapped by performing over 700 experiments in which the temperature, pressure, reaction time, and concentration of the feedstock were varied. The most important observations were that the pressure turned out to have no effect on the conversion and product yields, and that, noncatalytically, complete conversion to the gas phase is only possible for very diluted feedstock solutions (<2 wt %). By adding ruthenium on a TiO2 carrier (Ru/TiO2) to the capillaries, the potential of heterogeneous catalysis has been demonstrated. When adding this catalyst to the capillaries, glucose solutions in the range of 1−17 wt % could be gasified completely.

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Estimation of Chemical Equilibria In High-Pressure Gaseous Systems by a Modified Redlich-Kwong-Soave Equation of State

Cited by 13 publications

References 9 publications

Catalytic and Non-catalytic Supercritical Water Gasification of Microalgae and Glycerol

Catalytic and Non-catalytic Supercritical Water Gasification of Microalgae and Glycerol

Catalytic gasification of dry and wet biomass

Gasification of Model Compounds and Wood in Hot Compressed Water

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