Pretreatment of Acacia nilotica Sawdust by Catalytic Delignification and Its Fractal Kinetic Modeling

  • Abhyuday Mallick
  • Soumendra Nath Ash
  • Debashis Kumar Mahapatra
Original Contribution
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Abstract

Alkaline delignification of Acacia nilotica heartwood has been carried out using 10 % Sodium hydroxide and Sodium sulphide as the cooking liquor. Delignification was carried out at 373, 393, 403 and 413 K on Acacia nilotica sawdust of particle-sizes 70, 100 and 120 mesh, for durations ranging from 1 to 3 h. The reactions were carried out in presence and in absence of Ferrous sulphate to determine its catalytic properties in delignification. Maximum delignification achieved was 82.7 %, based on Klason lignin, in 3 h at 413 K for 120 mesh feed. The activation energies for delignification were 20.9275 and 35 kJ/mol, respectively, in presence and in absence of Ferrous sulphate, indicating its significant catalytic effect. A kinetic model for delignification was developed by modification of the Nuclei Growth model. Delignification extent could be predicted from the developed model quite accurately, with R2 values ranging from 0.947 to 0.99.

Keywords

Catalytic delignification Acacia nilotica Pretreatment Fractal kinetics Nuclei growth model Time-dependent rate coefficient 

List of Symbols

L

Amount of Klason lignin in delignified pulp

L0

Amount of Klason lignin in original biomass

Xi

Amount of lignin in biomass

X

Amount of lignin in pulp

E

Activation energy (kJ/mol)

T

Temperature (K)

T0

Reference temperature (K)

C

Concentration of cooking chemical (Molarity)

t

Time (min)

k

Reaction rate constant

M

Molarity

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Notes

Acknowledgments

The authors wish to thank the laboratory staff of the Department of Chemical Engineering, University of Calcutta, for their help in carrying out the experimental work. The authors also thank the Center for Research in Nanoscience and Nanotechnology (CRNN), University of Calcutta, for letting them avail the facilities of Scanning Electron Micrography.

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Copyright information

© The Institution of Engineers (India) 2015

Authors and Affiliations

  • Abhyuday Mallick
    • 1
  • Soumendra Nath Ash
    • 2
  • Debashis Kumar Mahapatra
    • 2
  1. 1.Department of Chemical EngineeringHeritage Institute of TechnologyAnandapur, KolkataIndia
  2. 2.Department of Chemical EngineeringUniversity of CalcuttaKolkataIndia

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