Factors Affecting the Amount of Naphthalene in Condensate During Boiling Under Vacuum in Creosote

When green wood is boiled under vacuum in creosote by the Boulton process, the condensate contains water and solids rich in naphthalene. Eleven charges were analyzed to establish a mathematical relationship between the amount of naphthalene in the condensate and the temperature of the boiling creosote when under vacuum. The 11 charges of western hemlock or Douglas-fir were boiled at 24 inches Hg. vacuum at 190?F. to 280?F. The data indicate that each pound of water carries over a fixed amount of naphthalene at a given operating condition. The higher the temperature of the creosote, the higher the naphthalene content in the condensate. At 24 inches Hg. of vacuum, the naphthalene makes up to 18 to 142 percent of the water as the temperature increases from 190?F. to 280?F. When plotted with the ratio of naphthalene to water as the ordinate and temperature as the abscissa, a curve concave upward is obtained.

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