Mass transfer phenomena during potassium carbonate catalysed carbon steam gasification reactions in a microbalance setup

Wigmans, Teus; Cranenburgh, Harry van; Elfring, Rien; Moulijn, Jacob A.

doi:10.1016/0008-6223(83)90152-5

Cited by 15 publications

(9 citation statements)

References 12 publications

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“…x I-I 0.4 served no significant influence on conversion behaviour, the possibility of external mass transport limita-0.2 tion may not be excluded (Wigmans et al, 1983). Better agreement exists with the results of Pell (1971) 0.0 who examined the suphidation of fully calcined dolomite powder in a TGA.…”

Section: The Grain Size Distribution Modelmentioning

confidence: 76%

The sulphidation of calcined limestone with hydrogen sulphide and carbonyl sulphide

Heesink

Swaaij

1995

Chemical Engineering Science

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The sulphidation of calcined limestone with H2S , COS and mixtures of H2S and COS was studied in a thermogravimetric analyzer at temperatures between 500 and 700°C. The applied H2S-and COS-pressures corresponded with those in coal gas produced by modern coal gasifiers, i.e. 50-12,000 Pa for H2S and 50-1000 Pa for COS. The reaction orders in H2S and COS as well as the activation energies of the involved reactions were determined. The mechanism of sulphidation was examined by simulating measured conversion vs time behaviour with the grain size distribution model of Heesink et al. (1993, Chem. Enong J. 53, 25-37).

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Section: The Grain Size Distribution Modelmentioning

confidence: 76%

The sulphidation of calcined limestone with hydrogen sulphide and carbonyl sulphide

Heesink

Swaaij

1995

Chemical Engineering Science

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“…Diffusion rates in He are higher than in A or N 2 , resulting in faster transport of reactants and products: Especially in microbalances this method can detect transport limitations, as is nicely demonstrated by Wigmans et al [112]. Binary gas diffusion limitations, when using mixtures of reactants and inert gases, can be detected by changing the inert gas.…”

Section: Vi-3 Mass Transfer Limitationsmentioning

confidence: 89%

Kinetics of Catalysed and Uncatalysed Coal Gasification

Kapteijn

Moulijn

1986

Carbon and Coal Gasification

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“…Prior to performing the actual pyrolysis experiments, the external mass and heat transfer characteristics to the crucible were studied. The external mass transfer coefficient was determined from naphthalene evaporation experiments (Wigmans et al (1983)), whereas the external heat transfer coefficient was determined by measuring the temperature versus time curve of the crucible during the heating period with a small K-type thermocouple inserted into the crucible. From this data the external heat transfer coefficient to the crucible could be calculated.…”

Section: Random Chain Dissociationmentioning

confidence: 99%

Kinetics of the Low-Temperature Pyrolysis of Polyethene, Polypropene, and Polystyrene Modeling, Experimental Determination, and Comparison with Literature Models and Data

Westerhout

Waanders

Kuipers

et al. 1997

Ind. Eng. Chem. Res.

303

176

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The pyrolysis kinetics of low-density polyethylene, high-density polyethylene, polypropylene, and polystyrene has been studied at temperatures below 450°C. In addition, a literature review on the low-temperature pyrolysis of these polymers has been conducted and has revealed that the scatter in the reported kinetic data is significant, which is most probably due to the use of simple first-order kinetic models to interpret the experimental data. This model type is only applicable in a small conversion range, but was used by many authors over a much wider conversion range. In this investigation the pyrolysis kinetics of the forementioned polymers and a mixture of polymers has been studied at temperatures below 450°C by performing isothermal thermogravimetric analysis (TGA) experiments. The TGA experimental data was used to determine the kinetic parameters on the basis of a simple first-order model for high conversions (70-90%) and a model developed in the present study, termed the random chain dissociation (RCD) model, for the entire conversion range. The influence of important parameters, such as molecular weight, extent of branching and-scission on the pyrolysis kinetics was studied with the RCD model. This model was also used to calculate the primary product spectrum of the pyrolysis process. The effect of the extent of branching and the initial molecular weight on the pyrolysis process was also studied experimentally. The effect of the extent of branching was found to be quite significant, but the effect of the initial molecular weight was minor. These results were found to agree quite well with the predictions obtained from the RCD model. Finally, the behavior of mixtures of the aforementioned polymers was studied and it was found that the pyrolysis kinetics of the polymers in the mixture remains unaltered in comparison with the pyrolysis kinetics of the pure polymers.

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Mass transfer phenomena during potassium carbonate catalysed carbon steam gasification reactions in a microbalance setup

Cited by 15 publications

References 12 publications

The sulphidation of calcined limestone with hydrogen sulphide and carbonyl sulphide

The sulphidation of calcined limestone with hydrogen sulphide and carbonyl sulphide

Kinetics of Catalysed and Uncatalysed Coal Gasification

Kinetics of the Low-Temperature Pyrolysis of Polyethene, Polypropene, and Polystyrene Modeling, Experimental Determination, and Comparison with Literature Models and Data

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