. Canadian forest industries 1903. Lumbering; Forests and forestry; Forest products; Wood-pulp industry; Wood-using industries. THE CANADA LUMBERMAN August, 1903 through which water may be passed, washing- out the sugar in the wood which is the result of treatment in the digester by the sulphurous acid gas. Next comes the neutralizing vat or vats in which various acids in the solution are removed or neutralized by the addition of carbonate of lime. Then comes the fermenting process and then the still room. The fermentation and distilla- tion are precisely the same as in an ordinary distillery.
. Canadian forest industries 1903. Lumbering; Forests and forestry; Forest products; Wood-pulp industry; Wood-using industries. THE CANADA LUMBERMAN August, 1903 through which water may be passed, washing- out the sugar in the wood which is the result of treatment in the digester by the sulphurous acid gas. Next comes the neutralizing vat or vats in which various acids in the solution are removed or neutralized by the addition of carbonate of lime. Then comes the fermenting process and then the still room. The fermentation and distilla- tion are precisely the same as in an ordinary distillery. The process, as briefly described, is thoroughly to mix the sawdust with the sulphurous acid gas and water so that all parts of it are penetrated by the gas, thus converting a portion of the cellulose into sugar. This sugar, of which about 85 per cent, is fermentable, remains in the sawdust. This sawdust is then intro- duced into the exhaustion tanks where the water passes through them, the method being just like the making of drip coffee. The water simply passes through the sawdust, washing out the sugar. The digester or boiler in which the wood is first treat- ed is a revolving drum of iron, lined with lead to resist the action of the acids, then surrounded with a sieam jacket by which it is heated. This dru n is ni irly with sawdust— in the experimental plant about 400 pounds be- ;ng a charge. Into this is put about one- third of its weight of the acid solution. Then steam is turned into the jacket and the drum is set revolving slowly so as thoroughly to mix its contents. The steam in the outside jacket heats the saw- dust and other contents of ""the digester to a temperature of about 295 degrees Fahren- heit. This heat drives the gas out of the water into the wood and con- verts the cellulose into sugar, the gas pene- trating all the particles of wood and acting directly upon the cel- lulose. The pressure inside the digester, caused by the expan- sion of
Size: 1809px × 1382px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectforestsandforestry
