The arrangement is such that the rising vapors can regularly and
without obstruction traverse these materials of wide surface. The
condensed liquid falls back into the lower part of the boiler. The worm,
e, debouches into a cooler, F, fed with water through the cock, n.
At the bottom of the boiler, A, there is fixed a tubulure, r, closed by
a lever, s, and having a fastening device, o. This tubulure permits of
emptying the boiler into the reservoir, L.
A like arrangement is found in the boiler, C. The valves, V, serve to
introduce steam for heating into the double bottoms of the two boilers.
The water of condensation flows out through the tubes, u. The water for
cooling enters the coolers, F, J, and Z, through the cocks, n, and flows
out through the tubes, v.
The acetate, previously crushed, is placed in the boiler, A, and the
quantity of acid necessary to decompose it is added. The mass is
afterward mixed with care by means of the stirrer, and the distillation
may then proceed at once.
The vapors of acetic acid that are disengaged enter the boiler, C,
through the tube, d, and are kept hot by the steam. In the head, D, they
are separated into two portions, viz., into concentrated acetic acid,
which condenses by reason of its high boiling point, and into steam,
which distills and carries along but a very small amount of acetic acid.
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