Improvements in the Treatment of Cotton Seed Oil.
Year: 1894

page_text: Date of Application, 11th June, 1894.
Complete Specification Left, 11th Mar., 1895-Accepted, 11th May, 1895
PROVISIONAL SPECIFICATION.
Improvements in the Treatment of Cotton Seed Oil.
I, FRANK BOULTON ASPINALL, of No. 13 Blessington Road, Lee, Electrical
Engineer, do hereby declare the nature of this invention to be as follows:-
In order to purify crude cotton seed oil and to separate the coloring matter
which it naturally contains I agitate the oil with a mixed solution of caustic soda
and common salt. Afterwards on standing the clear and nearly colorless oil
separates and is drawn off.
The treatment may be hastened by the application of heat.
Doted this 11th 100s
- 1
Improvements in the Treatment of Cotton Seed Oil.
I, FRANK BOULTON ASPINALL, of No. 13 Blessington Road, Lee, Electrical
Engineer, 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 :-
This invention has for its object improvements in the treatment of cotton
seed oil.
For the practice of my invention the apparatus necessary is a tank able to hold
double the quantity of oil to be refined, it should be fitted with paddles to give
good mechanical agitation. Tanks also above level of this tank should be arranged
to hold salt water and caustic lye. Pipes should be provided to supply hot and
cold water into the tank and the tank also should be steam jacketted so that the
contents may be heated when required. At the bottom there should be a draw off
cock.
The crude oil which is to be treated is put into the tank at a temperature of
about 80° F. the agitator is then started and a solution of common salt in water
density about 10 Twaddell is added; about 80 gallons to a ton is used and the salt
water is thoroughly well mixed with the oil care being taken to continue the
agitation only long enough to obtain a thorough mixture. Caustic soda lye is then
added, the agitation still continuing; the caustic should be of a density about
22° Twaddell and its temperature about 80 Fahrenheit. Care must be taken to
put only sufficient caustic the appearance of the oil is a sufficient guide to the
operator; a sample spread on a plate should look clear although full of minute
dark spots; this test is well known to oil refiners.
Directly the oil is broken by means of caustic applied as above described the
agitation should be stopped at once, and warm water, say about 140° F. thoroughly
sprinkled over oil. In some cases cold water may be used. The clean oil will
then come to the top, and the colouring matter go into the water and subside
with it.

page_text: Plenty of water must be used, until all clots in the oil have disappeared, are
thoroughly dissolved, and any oil at first carried down in mechanical mixture with
colouring matter has separated and risen to the surface.
Different oils may require to be treated with different strengths and quantities
of caustic soda and salt solution, but this is readily ascertained by trial.
I prefer to treat the oil when warm. The oil after treatment and when
thoroughly washed can be separated from water in mechanical mixture by heating
to say 160 F. When this process is properly worked practically no saponification
of the oil takes place. No mucilage is formed. Finally the oil may be brightened
by ordinary means and is then ready for the market as sweet oil; or if it is
required for bleached oil, it is bleached by ordinary means. The above process is
applicable to either cold drawn, or hot drawn oil.
The process can be carried out in one tank.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
The refining of cotton seed oil by first agitating and mixing it with a solution of
common salt and then whilst it is so agitated and mixed treating it with caustic lye,
and afterwards washing with water.
Dated this 4th day of March 1895.
FRANK B. ASPINALL.