Year: 1885

page_text: I, ALLAN TWISTLETON HALL of No 1 Grosvenor Terrace, Beverley Road, Hull,
Manager do hereby declare the nature of this invention to be as follows:-
My invention consists in the recovery of oil and or grease from the refuse bran
or ground rice husks or other similar material used in the tin plate trade by means
of the usual hydro carbon solvent, or bi-sulphide of carbon by any of the well
known methods as they are now worked in this country and America for the
extraction of oil from palm-nut kernels, copra linseed, rapeseed &c.
By this means I recover almost all the oil and grease and render the material
acted on fit for re-use or other suitable purposes.

page_text: I, ALLAN TWISTLETON HALL of N° 1 Grosvenor Terrace, Beverley Road, Hull,
Manager do hereby declare the nature of this invention and in what manner
the same is to be performed to be particularly described and ascertained in and
by the following statement :-
In the manufacture of tin and terne plate it is usual to employ grease, such as a
mixture of palm oil and tallow. This grease is kept at a temperature above that.
of the tin or coating metal, and in this bath of hot grease the plates are immersed
in the finishing operation; consequently the plates are delivered covered with a
grease, and this it is usual to remove by rubbing the plates with bran or in some
cases ground rice husks or other like material is employed. In order to recover the
grease from this bran or like material and to render the bran or material suitable
to be again used I extract the grease in the following manner :-
At the
I employ a cylindrical or cubical vessel provided with a false bottom and capable
of being closed air tight at the top. In this vessel, upon the false bottom, I place
a quantity, say two tons of the bran or material containing the grease,
top of this vessel I provide a perforated pipe, and the pipe leads to the upper part
of another vessel in which a solvent liquid is contained. The liquid which
I employ by preference is a light hydro carbon oil; that known as benzine or light
petroleum oil is suitable. Another pipe is connected at the lower part of the vessel
containing the solvent, and by admitting water through this pipe, (the water being
heavier than the solvent) the latter is displaced and caused to pass into the vessel
containing the bran or material from which oil or grease is to be separated. The
solvent is delivered in a shower from the perforated pipe on to the surface of the
bran or material and over this material it is uniformly distributed. The solvent
percolates through the layer of bran or material, which is of a thickness of several
feet, taking with it the oil or grease which this material contained. The solution
passes through the false bottom and flows by an outlet pipe into a receiver. The
receiver is heated by means of a coil of steam pipes immersed in its contents at its
lower part and the heat so applied causes the solvent to evaporate. The vapour
passes from the receiver to a condenser and from the condenser the solvent is
delivered back into the vessel from which it was originally drawn. Samples are
taken from time to time of the liquid passing off from the vessel containing the
bran or material and when, by examination of these samples it is found that the
solvent comes away in a nearly pure state, free from oil or grease the operation is
stopped. The connection between the vessel containing the bran or material and
the receiver is then closed and free steam is turned into the receiver; it is caused
to blow through the oily liquid which the receiver then contains for the purpose of
separating from it the remaining solvent. The vapour of this solvent together
with the steam passes into the condenser and from thence, when condensed, into
the vessel from which the solvent is drawn. The water used for displacing the
solvent and causing it to pass into the vessel containing the bran or material is
partly drawn off as soon as a sufficient quantity of solvent has been displaced. At

page_text: the end of the operation steam is also admitted beneath the false bottom on which
the bran or material is supported, and this steam ascending amongst the bran or
material vaporises the remaining solvent, and with the vapour passes into the
condenser. The condensed liquid passes into the vessel in which the solvent is
stored.
The product which is now drawn off from the receiver is.a grease fit for some of
the purposes of tin plate works and for other uses has a commercial value. The
bran or material which has been treated requires only to be dried and is then suited
to be again used; and so, with care, the bran or material may be repeatedly
employed, and it need not be rejected from use until it is found to have become
mixed with grit derived from various sources which renders. its further use in tin
plate works undesirable.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is:-
The separation of grease from bran or similar material which has been employed
in the manufacture of tin plates or like metal coated plates by means substantially
as described wherein the said bran or material is treated with a solvent by which
not only is oily matter recovered but also the bran or other material is rendered fit
to be again used.