Translation 2783

365
The mass, now heated to 30 0 or 35 0 C, is conveyed through a pipe
into a vacuum-dryer, which consists of a horizontal boi:_er or drum made
of sheét-steel 15-16 mm thick, with two spherical bulges
roller with a stirrer runs through the boiler
A hollow
A. vacuum-pump creates a vacuum (600-700 mm of mercury) in the
dryer, as a result of which the mass, which weighs up to 14 tons, is
dehydrated.
or condenser.
The water vapoUr enters a steam-dome, and then a cooler
The fatty mass is dried foi about
two hours, and is then removed
by an air-compressor from the vacuum-dryer to oil-separators.
The oil
that.settles in the vacuum-dryer is trensferred to an oil-separator
with a conical bottom, in the lower Pàrt of which is mounted a platefilter,
the spaces between the plates being from 1 to 15 mm. It also
has a worm-screw for transferring the residue of dry prbtein matter to
a special receptacle, a heater.
In modern factory-ships the fatty mass from the vacuum-apparatuses
is transferred into a receptacle for oil and residues, and only
then into a super-decanter, where the oil is separated from the residues.
Processing of the_graksa.and the graksa-water. The graksa, which
varies in chemical composition, is conveyed from the oil-separator into
a supply-tank above the super-decanter.
At the same time seawater is
added to it in such a proportion that the resultant mixture has a temperature
• of about 90 0 C, the Araksa having arrived at a temperature of
140 0 C. After a sufficient amount of graksa has been received from the
various oil-separators the mixture is transferred to horizontal centrifuges
(the super-decanters), where the solid matter, which has a moisture
content of 50-55,, is removed. After further drying, graksa-meal is
prepared from it.
The graksa-water passes from the super-decanters into reception
vats and then into the supply-tanks of dirt-separators with capacity of
up to 12 cubic metres, into which water at a temperature of 65 0 -95 °
is also added. .1he oil extracted in the dirt-searators, which has a
water content of 0.5
the supply-tanks of purifying separators.
is passed first into settling-tanks and then into
urification of whale oil. -Lhe oil from the oil-peparators,
which contains an adlàixture of water and protein matter, is conveyed
into a settlim:;-tank u -1 cylinder with a conical bottom). 'hence it