Sorption Theories Applied To Wood

Authors

  • W. Simpson

Keywords:

sorption, isotherms, moisture content

Abstract

A number of sorption theories are discussed in relation to the wood-water system. The theories are tested in terms of how well they can be made to predict moisture content through curve fitting and how well they can predict heats of adsorption. Theories discussed are the BET (Brunauer, Emmett, Teller), Hailwood and Horrobin, King, and Peirce. Even though the theories can be fitted very closely to experimental sorption data, they do not do well in predicting heat of adsorption. They do, however, all suggest the same general form of adsorption: part of the water is intimately associated with cellulose molecules and part is distinctly less intimately associated.

References

Brunauer, S., P. H. Emmett, and E. Teller. 1938. Adsorption of gases in multimolecular layers. J. Am. Chem. Soc. 60:309-319.nHailwood, A. J., and S. Horrobin. 1946. Absorption of water by polymers: Analysis in terms of a simple model. Trans. Faraday Soc. 42B:84-102.nHearle, J. W. S., and R. H. Peters. 1960. Moisture in textiles. Butterworth's Sci. Publ.nKelsey, K. E., and L. N. Clarke. 1956. The heat of sorption of water by wood. Aust. J. Applied Sci. 7:160-175.nKing, G. 1960. Theories of multilayer adsorption. J. W. S. Hearle, and R. H. Peters, eds. In Moisture in textiles, Textile Book Publ. Inst., Inc. N.Y.nMeredith, R. 1957. Rigidity, moisture, and fibre structure. J. Text. Inst. 48(6):T163-174.nPeirce, F. T. 1929. A two-phase theory of the adsorption of water vapor by cotton cellulose. J. Text. Inst. 20:T133-T150.nSimpson, W. T. 1973. Predicting equilibrium moisture content of wood by mathematical models. Wood Fiber 5(1):41-49.nSkaar, C. 1972. Water in wood. Syracuse Univ. Press.nStamm, A. J. 1964. Wood and cellulose science. Ronald Press.nU.S. Forest Products Laboratory. 1974. Wood handbook. USDA Handb. No. 72, rev.nVenkateswaran, A. 1970. Sorption of aqueous and nonaqueous media by wood and cellulose. Chem. Rev. 70(6):619-637.nVolbehr, B. 1896. Thesis, University of Kiel, Germany.n

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Published

2007-06-27

Issue

Number 3 / Fall 1980

Section

Research Contributions

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