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Optimizing packing heterogeneity for sorption enhanced metathesis reaction

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Abstract

An equilibrium-limited heterogeneous catalytic reaction, propene metathesis is suitable for process intensification via sorption enhanced reaction. In this work, we investigate the effect of catalyst/adsorbent configuration for propene metathesis in conjunction with pressure swing reaction. The catalyst and adsorbent configuration variations were defined in terms of packing heterogeneity index (PHI) and their effects were investigated experimentally and theoretically. Model predictions were tested against experimental data with variable PHI and adsorption/reaction conditions, including the absence of heterogeneity and of separation process. The product 2-butene was strongly adsorbed and retained by the intermediate adsorbent layers, thereby increasing reactant concentration in the reaction zone and enhancing conversion and rate of reaction in the subsequent layer. Model predictions were found to agree reasonably with experimental data and were used to elucidate the mechanism and optimizing principle for such reactors.

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Abbreviations

B:

Langmuir adsorption coefficient (kg/mol)

C:

Gas phase species concentration (mol/cm3)

Dz :

Axial dispersion coefficient (m2/s)

K:

Mass transfer coefficient (s−1)

L:

Bed length (m)

LC,k :

Length of kth catalyst layer

LA,k :

Length of kth adsorbent layer

Nc:

Number of components

P:

Pressure (atm)

Pe:

Peclet number

Q:

Species concentration in adsorbed phase (mol/kg)

\( r_{rxn} \) :

Rate of reaction (mol/s kg)

T:

Temperature

t:

Time (s)

u:

Gas velocity (m/s)

\( \overline{v} \) :

Dimensionless interstitial fluid velocity

\( x_{CA} \) :

Catalyst/adsorbent volume ratio

xi :

Dimensionless solid-phase mole fraction

y:

Gas phase mole fraction

z:

Axial distance

\( \alpha_{i} \) :

Dimensionless mass transfer coefficient = kiL/u

ε:

Bed voidage

ϕ:

Packing heterogeneity index

\( \lambda \) :

Ethene production (mole/kgcat/ads/s)

ρ:

Density (kg/m3)

\( \upsilon_{\text{i}} \) :

Stoichiometric coefficient of component i

τ:

Dimensionless time

\( \xi \) :

Mass capacity factor

Ads:

Adsorbent

Cat:

Catalyst

Feed:

Feed stream

i:

Gas species

P:

Propene

B:

Butene

E:

Ethene

H:

High pressure

L:

Low pressure

S:

Saturation

*:

Equilibrium condition

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Acknowledgments

The authors acknowledge the award of a postgraduate studentship by Al-Hussein Bin Talal University (Jordan) and support from the Australian Research Council (ARC).

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Author notes

  1. Saleh Rawadieh & Ibrahem Altarawneh

    Present address: Department of Chemical Engineering, Al-Hussein Bin Talal University, Ma’an, 71111, Jordan

Authors and Affiliations

  1. School of Chemical & Biomolecular Engineering, The University of Sydney, Sydney, NSW, 2006, Australia

    Saleh Rawadieh, Vincent G. Gomes & Ibrahem Altarawneh

Authors
  1. Saleh Rawadieh
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  2. Vincent G. Gomes
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  3. Ibrahem Altarawneh
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Correspondence to Vincent G. Gomes.

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Rawadieh, S., Gomes, V.G. & Altarawneh, I. Optimizing packing heterogeneity for sorption enhanced metathesis reaction. Adsorption 20, 701–711 (2014). https://doi.org/10.1007/s10450-014-9614-z

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