publication . Article . 2008

Heterogeneous studies in pulping of wood: Modelling mass transfer of alkali

Simão, João P. F.; Egas, Ana P. V.; Carvalho, M. Graça; Baptista, Cristina M. S. G.; Castro, José Almiro A. M.;
Open Access
  • Published: 15 Jun 2008 Journal: Chemical Engineering Journal, volume 139, pages 615-621 (issn: 1385-8947, Copyright policy)
  • Publisher: Elsevier BV
  • Country: Portugal
Abstract
Abstract In this paper a heterogeneous lumped parameter model is proposed to describe the mass transfer of effective alkali during the kraft pulping of wood. This model, based on the spatial mean of the concentration profile of effective alkali along the chip thickness, enables the estimation of the effective diffusion coefficient that characterizes the internal resistance to mass transfer and the contribution of the external resistance to mass transfer which has often been neglected. The experimental data that support this study comprise measurements of alkali concentration in the liquid phases, both inside and outside the chips. The kraft pulping of Eucalyptus...
Subjects
free text keywords: Heterogeneous system, Mass transfer model, Kraft pulping, Eucalyptus globulus, Mass transfer resistance, Chromatography, Activation energy, Mass transfer, Effective diffusion coefficient, Alkali metal, Chemistry, External resistance, Internal resistance, Kraft process
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22 references, page 1 of 2

[1] N.C.P. Fernandes, J.A.A.M. Castro, Steady-state simulation of a continuous moving bed reactor in the pulp and paper industry, Chem. Eng. Sci. 55 (18) (2000) 3729-3738. [OpenAIRE]

[2] S.W. McKibbins, Application of diffusion theory to the washing of kraft cooked wood chips, Tappi J. 43 (10) (1960) 801-805.

[3] J.H. Talton Jr., R.H. Cornell, Diffusion of sodium hydroxide in wood at high pH as a function of temperature and the extent of pulping, Tappi J. 70 (1) (1987) 115-118.

[4] L. Robertse´n, B. Lo¨nnberg, Diffusion in wood. Part 2. The effects of concentration and temperature, Paperi ja Puu 73 (7) (1991) 635-639.

[5] T. Hultholm, L. Robertse´n, B. Lo¨nnberg, A. Kettunen, K. Henricson, Impregnation in alkaline pulping, in: Proceedings of the Tappi Pulping Conference, 1997, pp. 897-902.

[6] D.B. Tyler, L.L. Edwards, Predicting rejects from kraft cooking of overthick chips - a model incorporating caustic diffusion with delignification kinetics, Svensk Papperstidn. 85 (18) (1982) 180-184.

[7] R.R. Gustafson, C.A. Sleicher, W.T. McKean, B.A. Finlayson, Theoretical model of the kraft pulping process, Ind. Eng. Chem. Process Des. Dev. 22 (1) (1983) 87-96. [OpenAIRE]

[8] S. Mirams, K.L. Nguyen, A predictive model of eucalypt kraft pulping, Proc. Appita (1994) 187-194.

[9] N. Agarwal, R. Gustafson, S. Arasakesari, Modeling the effect of chip size in kraft pulping, Paperi ja Puu-Paper and Timber 76 (6-7) (1994) 410-416.

[10] A.P.V. Egas, J.P.F. Sima˜o, I.M.M. Costa, S.C.P. Francisco, J.A.A.M. Castro, Experimental methodology for heterogeneous studies in pulping of wood, Ind. Eng. Chem. Res. 41 (10) (2002) 2529- 2534.

[11] K.M.F. Kazi, H. Gauvin, P. Joliez, E. Chornet, A diffusion model for the impregnation of lignocellulosic materiais, Tappi J. 80 (11) (1997) 209-219.

[12] A. Rosen, Adsorption of sodium ions on kraft pulp fibers during washing, Tappi 58 (9) (1975) 156-161.

[13] G. Eriksson, U. Gre´n, Pulp washing: sorption equilibria of metal ions on kraft pulps, Nordic Pulp Paper Res. J. 11 (3) (1966) 164-170.

[14] J.P.F. Sima˜o, A.P.V. Egas, C.M.S.G. Baptista, M.G. Carvalho, J.A.A.M. Castro, Evolution of methylglucuronic and hexenuronic acid contents of eucalyptus globulus pulp during kraft delignification, Ind. Eng. Chem. Res. 44 (9) (2005) 2990-2996.

[15] J.P.F. Sima˜o, A.P.V. Egas, C.M.S.G. Baptista, M.G. Carvalho, Heterogeneous kinetic model for the methylglucuronic and hexenuronic acids reactions during kraft pulping of Eucalyptus globulus, Ind. Eng. Chem. Res. 44 (9) (2005) 2997-3002.

22 references, page 1 of 2
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publication . Article . 2008

Heterogeneous studies in pulping of wood: Modelling mass transfer of alkali

Simão, João P. F.; Egas, Ana P. V.; Carvalho, M. Graça; Baptista, Cristina M. S. G.; Castro, José Almiro A. M.;