Chemical Drying of Southern Pine Wood . . . a Review

Past and present practices of using chemicals in the seasoning of southern pine are reviewed, and several processes currently being employed on a commercial basis are described, giving specific data for time, temperature, and extent of drying. Sodium chloride and urea have been the only chemicals used in commercial drying of southern pine. Chemicals used as a heat transfer media in the drying of southern pine have all been organic liquids such as diesel oil, kerosene, xylene, or Stoddard solvent. Boiling-in-oil is probably the oldest method for chemically drying wood. Like the boiling-in-oil process, vapor drying represented a rediscovery and improvement of older processes. The solvent seasoning process uses liquid polar solvents such as acetone to dry wood. This process has been limited to drying of western pines, but there is no reason to expect that it would not be just as effective for the drying of southern pine.

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