. Canadian forest industries 1901-1902. Lumbering; Forests and forestry; Forest products; Wood-pulp industry; Wood-using industries. October, 1901 THE CANADA LUMBERMAN es, which would, until eliminated, injure the uality of the acetate. Acetic acid is sufficiently powerful to expel ie carbonic acid in limestone, but the neutral- ation process causes thereby a strong effer- bscence, so that it must be accomplished in >rge, deep tanks in which the effervescing u'xture will not boil over. If instead of lime- tone burnt lime is used, the effervescence is reatly reduced; but in either case it is
. Canadian forest industries 1901-1902. Lumbering; Forests and forestry; Forest products; Wood-pulp industry; Wood-using industries. October, 1901 THE CANADA LUMBERMAN es, which would, until eliminated, injure the uality of the acetate. Acetic acid is sufficiently powerful to expel ie carbonic acid in limestone, but the neutral- ation process causes thereby a strong effer- bscence, so that it must be accomplished in >rge, deep tanks in which the effervescing u'xture will not boil over. If instead of lime- tone burnt lime is used, the effervescence is reatly reduced; but in either case it is import- nt that the amount of basic material (lime) ;e not in excess. In other words, it should be ist sufficient to neutralize the acetic acid— /hich it does first—and not enough to take up ftervvard the acid elements of the tar, which, ieing lighter than the acetate of lime, rise to he surface during the reaction and should be amoved by skimming. The clarified solution 5 then evaporated in large shallow pans, yield- ->g as a residuum crude acetate of lime. Over- heating during the evaporation decomposes he acetate, so that a slow, steady and uniform ieat is necessary, and for this purpose the off 'ases from the retorts in which the wood is p listilled are used whenever practicable. The rude residuum is a gray, odorless mass, con- laining about 75 per cent, of pure calcium Icetate, and forms a standard article of com- inerce. It is purified by dissolving in water, Altering through bone black, and concentrates f>y evaporation to a specific gravity of , when the sale crystallizes in small, odorless needles, which are principally used as material or the production of acetone. Acetate of lime appears in commerce in three grades of purity, the highest of which is nowT worth in large quantities marks a kilogram (27 cents a pound) ; the medium, marks (18 cents a pound), and the lowest grade marks (15 cents a pound). Its growing importance as a commercial
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectforests, bookyear1902
