. Fig. 3.—Plan of retort used for distillation of samples. with certain decomposition products, as pitch, in the bottom of the retort. The distillation is therefore conducted in two stages. During the first stage the turpentine is recovered, and the result- ing rosin liberated from the wood is collected in the bottom of the retort. The' oil-bath temperatures during this stage are between ap- proximately 220° and 265° C. The valve to the bottom coil (d) that lies embedded in the molten rosin is then opened, and the tempera- ture of the circulating oil raised to 343° C. This brings about de- str
. Fig. 3.—Plan of retort used for distillation of samples. with certain decomposition products, as pitch, in the bottom of the retort. The distillation is therefore conducted in two stages. During the first stage the turpentine is recovered, and the result- ing rosin liberated from the wood is collected in the bottom of the retort. The' oil-bath temperatures during this stage are between ap- proximately 220° and 265° C. The valve to the bottom coil (d) that lies embedded in the molten rosin is then opened, and the tempera- ture of the circulating oil raised to 343° C. This brings about de- structive distillation of the wood and the rosin, with the production of pyroligneous acid and the formation of rosin oils containing also creosote and other constituents derived from the wood, which distil from the retort in two stages as light oil and heavy oil. The light and heavy oils come over with the aqueous distillate (pyroligneous acid) resulting from the chemical transformation of the wood and rosin during the destructive stage of the distillation,
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Keywords: ., bookcentury1900, bookdecade1920, bookpublisherwashi, bookyear1921
