Thermogravimetric Analysis of Loblolly Pine Bark Components<sup>1</sup>
Keywords:Pinus taeda, holocellulose, Klason lignin, atmospheric effects
AbstractThermogravimetric analysis of loblolly pine bark components (extractive-free bark, alkali-soluble material, alkali-extracted residue, Klason lignin, and holocellulose) was performed under different atmospheres. Degradation patterns of these bark components were different depending on composition and on the pyrolytic atmosphere. In the presence of oxygen, the rate of thermal decomposition was greater, and all bark materials were converted to volatile products. Thermal reactions under nitrogen and hydrogen and in vacuum were much slower and gave larger amounts of nonvolatile residue. Thermal curves obtained under nitrogen and hydrogen were very similar, while pyrolysis under vacuum conditions gave decreased amounts of char residue with the greatest effect in the holocellulose fraction.
Beall, F. C. 1969. Thermogravimetric analysis of wood lignin and hemicellulose. Wood Fiber 1(3):215-226.nBrowning, B. L. 1952. The polysaccharide fraction of wood. Isolation of cellulose preparations and the determination of cellulose, pp. 1138-1158. The analysis of non-cellulose polysaccharides, pp. 1159-1191. The evaluation of cellulose preparations, pp. 1238-1258. In Wood chemistry v. 2. Reinhold Publishing Corp., New York.nCorder, S. E., G. H. Atherton, D. E. Hyde, and R. W. Bonlie. 1970. Wood and bark residue disposal in lignin burners. Bulletin 11. For. Res. Lab., Oregon State Univ., Corvallis, Oregon.nErman, W. F., and W. I. Lyness. 1965. The isolation, purification, and structure determination of a phenolic acid fraction from slash pine bark. Tappi 48(4):249-256.nFang, P., and G. D. McGinnis. 1975. Poly-phenols from loblolly pine bark. Proc. Eighth Cellulose Conf., held May 19-23 1975, Syracuse, New York. Part 1, 363-376.nMartin, W. F. 1968. The separation of phenols, derived from spruce/balsam bark pyrolyzates on polyamide. Wood Sci. 1(2):102-104.nMcGinnis, G. D., and S. Parikh. 1975. The chemical constituents of loblolly pine bark. Wood Sci. 7(4):295-297.nRitter, G. J., R. M. Seborg, and R. L. Mitchell. 1932. Determination of lignin in wood. Ind. Eng. Chem. Anal. Ed. 4:202.nSarles, R. L. 1969. Economic aspects of bark utilization. Proc. Symp. Marketing and Selling Bark Products. San Francisco, Calif. Pp. 24-44. Forest Products Research Society.nShafizadeh, F., and G. D. McGinnis. 1971. Chemical composition and thermal analysis of cottonwood. Carbohyd. Res. 16:273-277.nSwan, E. P. 1963. Characteristics of a phlobaphene from western red cedar bark. For. Prod. J. 13(1):195-201.nVroom, A. H. 1952. Bark pyrolysis by fluidization techniques. Pulp Paper Mag. Can. (April) 53:121-124.nWood Products Sub-Council. 1971. Principal pollution problems facing the solid wood products industry. For. Prod. J. 21(9):33-36.nZavarin, E., and K. Snajberk. 1963. The chemistry of the natural phlobaphenes. Tappi 46(5):320-323.n
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