Improvements in Extracting Oil or Grease.
Year: 1889

page_text: Date of Application, 26th Nov., 1889
Complete Specification Left, 26th Aug., 1890-Accepted, 18th Oct., 1890
PROVISIONAL SPECIFICATION.
Improvements in Extracting Oil or Grease.
We, WILLIAM Hesketh Lever and JAMES DARCY LEVER, trading as Lever
Brothers, Soap Manufacturers, and ERNEST GEORGE SCOTT, Chemist to the said firm,
all of Port Sunlight near Birkenhead, in the County of Chester, do hereby declare
the nature of this invention to be as follows:-
وو
Seeds and other materials have been deprived of their oil or grease by means of
carbon bisulphide, this is preferably done in a series of vessels and methodical
treatment, the fresh carbon bisulphide in such case attacking nearly exhausted seed.
or other material, and the nearly saturated bisulphide being made to act last on
nearly fresh seed or other material. The carbon bisulphide is afterwards distilled
from the grease.
Now there are several disadvantages in this process which have prevented its
general adoption.
1st. The carbon bisulphide fumes are very disagreeable and deleterious to health.
2nd. They are very inflammable.
3rd. They leave a disagreeable taste and smell in the oil or grease obtained, making
it useless for many purposes.
Now we have found that carbon tetrachloride will effect this purpose, and that by
the substitution of carbon tetrachloride for carbon bisulphide, these difficulties are
in large part removed, the disagreeable and poisonous odour is exchanged for a
pleasant one not so poisonous, or apparently not poisonous at all, except when in a
concentrated form.
The tetrachloride vapour is non-inflammable at the temperatures employed. Its
boiling point is low and there is therefore great economy in its use, while it is high
enough to prevent or avoid evaporation at ordinary temperatures to any great degree.
It is not liable to decomposition and leaves no unpleasant smell in the materials
operated upon; it has remarkably high extracting powers.
The colour of the oil or grease obtained by tetrachloride is generally superior to
that obtained by the use of bisulphide. This is probably owing to the fact that
sulphides and sulpbo-carbonates are formed with metallic and other bases in the
bisulphide of carbon process, and these compounds are usually dark coloured,
whereas, this cannot take place when tetrachloride is used.
Our invention therefore consists in the use of carbon tetrachloride instead of carbon
bisulphide for this purpose.
The same plant and process are used as with carbon bisulphide, so it is needless to
describe them further.
AA
זג
1000
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Patent Agents for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Extracting Oil or Grease.
We, WILLIAM HESKETH LEVER and JAMES DARCY LEVER, trading as Lever
Brothers, Soap Manufacturers, and ERNEST GEORGE SCOTT, Chemist to the said firm,
all of Port Sunlight, near Birkenhead, in the County of Chester, 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 :-
Seeds and other materials have been deprived of their oil or grease by means of
carbon bisulphide, this is preferably done in a series of vessels and "methodical "

page_text: treatment, the fresh carbon bisulphide in such case attacking nearly exhausted seed
or other material, and the nearly saturated bisulphide being made to act last on
nearly fresh seed or other material. The carbon bisulphide is afterwards distilled
from the grease.
Now there are several disadvantages in this process which have prevented its
general adoption.
1st. The carbon bisulphide fumes are very disagreeable and deleterious to health.
2nd. They are very inflammable.
3rd. They leave a disagreeable taste and smell in the oil or grease obtained, making
it useless for many purposes.
Now we have found that carbon tetrachloride will effect this purpose, and that by
the substitution of carbon tetrachloride for carbon bisulphide, these difficulties are in
large part removed, the disagreeable and poisonous odour is exchanged for a pleasant
one not so poisonous, or apparently not poisonous at all, except when in a concentrated
form.
The tetrachloride vapour is non-inflammable at the temperatures employed. Its
boiling point is low and there is therefore great economy in its use, while it is high
enough to prevent or avoid evaporation at ordinary temperatures to any great degree.
It is not liable to decomposition and leaves no unpleasant smell in the materials
operated upon, it has remarkably high extracting powers.
The colour of the oil or grease obtained by tetrachloride is generally superior to
that obtained by the use of bisulphide. This is probably owing to the fact that
sulphides and sulpho-carbonates are formed with metallic and other bases in
the bisulphide of carbon process, and these compounds are usually dark coloured,
whereas, this cannot take place when tetrachloride is used.
Our invention therefore consists in the use of carbon tetrachloride instead of carbon
bisulphide for this purpose.
The same plant and process are used as with carbon bisulphide, so it is needless to
describe them further.
Having now particularly described and ascertained the nature of our said inven
tion and in what manner the same is to be performed, we declare that what we
claim is
The use or employment of carbon tetrachloride in lieu of carbon bisulphide in
the extraction of oil or grease from seeds or other substances, substantially as
described.
Dated this 25th day of Amanot 1800
WM. P. THOMPSON & Co.,
Of Liverpool, Manchester, Nottingham, and London, Patent Agents.