Accession Number : AD0664559

Title :   EFFECT OF INORGANIC SALTS ON PYROLYSIS OF WOOD, CELLULOSE, AND LIGNIN DETERMINED BY DIFFERENTIAL THERMAL ANALYSIS.

Descriptive Note : Forest Service research paper,

Corporate Author : FOREST PRODUCTS LAB MADISON WIS

Personal Author(s) : Tang,Walter K. ; Eickner,Herbert W.

Report Date : JAN 1968

Pagination or Media Count : 34

Abstract : Differential thermal analysis was conducted in both helium and oxygen atmospheres on the thermal decomposition of wood, cellulose, and lignin, untreated and treated with 2 and 8 percent by weight of eight inorganic salts and an acid. Thermograms were obtained for the temperature ranges for endothermic and exothermic reactions, for the temperatures of maximum heat absorption or release, and for the heat intensities. These data combined with results of a previous work utilizing thermogravimetric analysis provide additional information on the characteristics of thermal decomposition. In particular, these data show that the net heat of pyrolysis for untreated and treated cellulose is endothermic. The heat of pyrolysis for both wood and lignin is initially endothermic and later becomes exothermic. However, the net exothermic heat of pyrolysis for wood is only about 2 percent of the heat of combustion. The heat of combustion from wood is released by flaming of the volatiles with a maximum release at about 310C and a glowing of the solids with a second maximum release at about 440C. The influence of the several types of effective and ineffective fire-retardant salts on the initial temperature of volatilization, rate of decomposition and heat release, transition temperatures of volatilization and heat release, and maximum heat intensities are also related by this work to theories that have been developed concerning the retarding of flaming and glowing reactions of wood and its components. (Author)

Descriptors :   (*FIRE RESISTANT MATERIALS, WOOD), (*WOOD, PYROLYSIS), (*CELLULOSE, PYROLYSIS), (*LIGNIN, PYROLYSIS), ADDITIVES, SALTS, SODIUM COMPOUNDS, BORATES, SODIUM CHLORIDE, POTASSIUM COMPOUNDS, CARBONATES, ALUMINUM COMPOUNDS, CHLORIDES, AMMONIUM COMPOUNDS, PHOSPHATES, SULFATES, BORIC ACID, DIFFERENTIAL THERMAL ANALYSIS, THERMOCHEMISTRY, FIRE SAFETY, THESES

Subject Categories : Physical Chemistry
      Wood, Paper and Related Forestry Products
      Safety Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE