An Improved Process of Recovering Volatile Solvents Retained in Substances Treated therewith.
Year: 1889

page_text: Date of Application, 24th June, 1889
Complete Specification Left, 30th Nov., 1889-Accepted, 4th Jan.,
1890
PROVISIONAL SPECIFICATION.
[Communicated from abroad by LA SOCIÉTÉ ANONYME DES PARFUMO NATURELS DE
CANNES, of 95, Boulevard Beaumarchais, Paris, in the Republic of France.]
An Improved Process of Recovering Volatile Solvents Retained
in Substances Treated therewith.
1, HENRY HARRIS LAKE of the firm of Haseltine, Lake & Co., Patent Agents,
Southampton Buildings, in the County of Middlesex, do hereby declare the nature of
this invention to be as follows :-
In industries where volatile solvents are used for extracting marketable substances
from raw materials the recovery of the solvent which at the end of each operation
remains in the spent material plays an important part among the factors which
constitute the prime cost, and it will therefore be perceived that great interest
attaches to any method by which an economy can he realized in this phase of the
manufacture.
-
The most perfect process that has heretofore been employed is based upon the
volatility of the solvent. It consists in heating the material impregnated with the
solvent to a sufficiently high temperature for the latter to be separated by volatiliza-
tion and in subsequently condensing the vapors obtained so as to convert the solvent
into the liquid state in which it is employed. In short the solvent is recuperated
by distillation.
The process which forms the subject of the present invention consists in extracting
the solvent from the spent material in the liquid state without volatilizing it (unless
it he a very small part) thus obviating all the expences necessitated by the successive
vaporization and condensation.
In carrying the said invention into effect a small jet of steam is introduced into
the extractor above the material to be treated, instead of below the same as in the
ordinary method. By pressure and progressive substitution the steam gradually
forces the solvent downwardly, expelling it in the liquid state through the lower
part of the extractor. The steam having slowly passed through the entire material
and not meeting any longer with sufficient resistance, escapes through the bottom
of the extractor, being mixed with the last traces of the solvent. For collecting
the latter and obviating any loss it is useful to insert a small refrigerator between
the aforesaid extractor and the reservoir for the solvent.
Dated the CT1000
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.
COMPLETE SPECIFICATION.
An Improved Process of Recovering Volatile Solvents Retained
in Substances Treated therewith.
I, HENRY HARRIS LAKE, of the firm of Haseltine, Lake & Co., Patent Agents
Southampton Buildings, in the County of Middlesex 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 industries where volatile solvents are used for extracting marketable substances
from raw materials the recovery of the solvent which at the end of each operation
remains in the spent material plays an important part among the factors which
constitute the prime cost, and it will therefore be perceived that great interest
[ Price fid

page_text: attaches to any method by which an economy can be realized in this phase of the
manufacture.
The most perfect process that has heretofore been employed is based upon the
volatility of the solvent. It consists in heating the material impregnated with the
solvent to a sufficiently high temperature for the latter to be separated by volatiliza-
tion and in subsequently condensing the vapours obtained so as to convert the solvent
into the liquid state in which it is employed. In short, the solvent is recuperated by
distillation.
The process which forms the subject of the present invention consists in extracting
the solvent from the spent material in the liquid state without volatilizing it (unless it
be a very small part), thus obviating all the expenses necessitated by the successive
vaporization and condensation.
The invention is illustrated in the accompanying drawing.
In carrying the said invention into effect a small jet of steam is introduced into the
extractor A through the upper part B and above the material to be treated; instead
of below the same as in the ordinary method. By pressure and progressive sub-
stitution the steam gradually forces the solvent downwards, expelling it in the liquid
state through the lower part C of the extractor. The steam having slowly passed
through the entire material, and not meeting any longer with sufficient resistance,
escapes through the bottom of the extractor, being mixed with the last traces of the
solvent; for collecting the latter and obviating any loss it is useful to insert a small
refrigerator R between the aforesaid extractor and the reservoir D, for the solvent.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed as communicated to me
by my foreign Correspondents I declare that what I claim is ;-
The improved method of recovering volatile solvents retained by the materials
treated therewith, in which method the steam forces out nearly all the solvent in
the liquid state, and more especially characterized by the introduction of the steam
through the upper part of the extractor, the whole as hereinbefore described and
represented in the accompanying drawings.
Dated this 30th day of November 1889.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.