Year: 1885

page_text: I, ALLAN TWISTLETON HALL of 1 Grosvenor Terrace Beverley Road Hull
Gentleman do hereby declare the nature of this invention to be as follows:-
The Invention consists of the method of refining linseed or rape oils when in
solution in benzoline or petroleum spirit or any other of the usual hydrocarbon
solvents or in bisulphide of carbon by treating the same with sulphuric acid and
agitating. As soon as the action of the acid has destroyed the coloring matter of
the oil the agitation is discontinued and the black mud formed is allowed to settle
or is removed by means of a filter. The mass is then agitated with water to
remove from it the acid and is again allowed to stand to separate the bulk of the
The supernatant liquid which consists of the solvent and oil is now drawn
into a closed vessel and heated with loose steam to drive off the solvent which is
condensed for re-use in the usual manner leaving the refined oil behind.
water.
:
CARPMAEL & Co.,
Agents for the Applicant.
I ALLAN TWISTLETON HALL of 1 Grosvenor Terrace Beverley Road Hull
Gentleman 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 :—
My invention is especially applicable to refining the crude oil of rape seed and

page_text: bi-sulphate of carbon may be used. To the solution of oil in spirit which I thus
obtain I add in the case of rape oil from one half to five per cent or more of
sulphuric acid-I vary the amount of: acid according to the greater or less amount
of impurity which the oil contains. For rape oil I use a strong acid of a specific
gravity of say 1-840-I introduce the acid into the oil solution whilst the latter is
contained in a closed vessel-I run in the acid through a perforated pipe so that
the acid may pass into the oil in numerous fine thread like streams. During the
introduction of the acid I thoroughly agitate the contents of the vessel, afterwards
I allow the mixture to stand for some time, and a mud-like material subsides to
the bottom of the vessel. The colour of this mud will vary from green to black
according to the amount of acid which has been used-if the mud be quite black
it indicates that the quantity of acid employed has been larger than is necessary.
I draw the liquid off from the mud and, by preference, I thoroughly agitate the oil
solution with water in order to free it from any remaining acid. Then by
preference I pass it through a filtering bed of animal charcoal, say about two feet
thick The oil solution will be found to pass from the filter considerably lighter in
colour than it enters upon it. I now introduce the solution into another closed
vessel; here it is heated by blowing free steam through it. The heat evaporates
the solvent which passes into a condenser where it is condensed and is so recovered
in a state to be again used-the refined oil remains behind and in a state of greater
purity than if it had been refined by the processes hitherto employed.
When linseed oil is treated I proceed in a similar manner and employ about the
same amount of acid, but the acid should not be so strong as when treating rape
oil, a specific gravity of 1.750 will be found suitable. In some cases the rape oil
or linseed oil is separated from the seed by means of a solvent in lieu of by
pressure and in such case I proceed to separate the excess of solvent and to treat
the solution by means of sulphuric acid as already described.
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 :-
Refining vegetable oils by treating the same with sulphuric acid whilst held in
solution in hydro-carbon spirit or other solvent substantially as described.
DL: 10th dose of M. 1900C