Then the cover is fastened down and the boiler
is put in communication with the heating apparatus. The cocks, E and B,
are opened, so that the liquid may begin its movement in the tube, a,
the boiler, A, and the tube, n. As soon as the proper temperature
is reached for converting the wood into fiber and decomposing the
incrusting matters, the heat is shut off in case the tubing, R, is not
connected with another like boiler, and, after closing the cocks, E and
B, and shut off communication between the tubing and the boiler, the
latter is turned over and the cock, C, gradually opened in order to
allow the steam to escape. When the temperature has descended to 100 deg.
in the boiler the cover, D, may be opened, after the liquid has been
allowed to flow out through the cock, C. Next, lixiviation is effected
by connecting the cock, C, with the steam pipe, P, and causing steam
under pressure to enter the boiler, A. The action of the steam on the
contents of the latter, which are now converted into cellulose, mixed
with a large quantity of dissolved matters and of liquid, effects a
complete washing and permits of the recovery of considerable quantities
of useful chemical products. Moreover, the steam purifies, decolorizes,
and completely separates the fibers, and renders them more easily
susceptible of being bleached.
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