AN IMPROVED PROCESS OF REFINING GLYCERINE
Year: 1885

page_text: I, GEORGE PAYNE, of The Lodge, Leigham Court Road, Streatham, in the
County of Surrey, Chemical Manufacturer, do hereby declare the nature of
my invention for "AN IMPROVED PROCESS OF REFINING GLYCERINE" to be as
follows
―
My invention relates to the refining of glycerine, and consists in a process of
treating crude glycerine such as that obtained from spent leys as hereinafter set
forth
I am aware that a process is already known for treating the crude glycerine
obtained from spent ley to remove all disagreeable smell or taste before finally
distilling such crude glycerine
According to my said invention I take soap-ley and purify it by treatment with
acids and alkalis and free it as much as possible, by evaporation or concentration
of its contained fatty acids, resin and salts, the soap ley which has been thus
treated I term crude glycerine I then distil this crude glycerine to free it of all
salts This distillate which I term " once distilled" has a very disagreeable smell
and taste, presumably caused by the presence of certain bodies or substances
difficult of removal by distillation, I therefore wash this "once distilled" with
Oleic acid, oil, tallow, hydrocarbon, ether, bisulphide of carbon, amylic alcohol or
other solvent or washer which will dissolve such bodies or substances but which
will have no solvent effect on the glycerine The solvent or washer can then be
removed in any suitable manner
The product will be refined glycerine which can be further refined if desired by
subsequent distillation.
'

page_text: I, GEORGE PAYNE, of the Lodge, Leigham Court Road, Streatham, Surrey,
Chemical Manufacturer, 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 relates to a process of treating crude glycerine, such as that con-
tained in spent soap-ley, and obtaining pure glycerine therefrom as hereinafter
set forth
According to my said invention, I take soap-ley and purify it by treatment with
acids and alkalies, and free it as much as possible, by evaporation or concentration,
from fatty acids, resin, and salts, the soap-ley which has been thus treated I term
crude glycerine I then distil this crude glycerine to free it from all solid impuri-
ties, especially common salt. This distillate, which I term "once distilled," has a
very disagreeable smell and taste, presumably caused by the presence of certain
bodies or substances difficult of removal by distillation I therefore wash this
once distilled" product with oleic acid, oil, tallow, hydrocarbon, ether, bisulphide
of carbon, amylic alcohol, or other solvent or washer which will dissolve such
bodies or substances, but which will have no solvent effect on the glycerine For
this purpose I concentrate the "once distilled" glycerine to a density of about
forty (40) degrees Twaddell, and add to it the solvent in the proportion of
about ten (10) or fifteen (15) per cent of the quantity of glycerine, and subject
the same to agitation by any suitable mechanical means. I continue this agitation
until all of the above named bodies or substances have been dissolved out of the
glycerine.
The quantity of solvent and the time required for its action will vary slightly
according to the quality of the glycerine, and, in some instances, the treatment
with the solvent may have to be repeated
After the treatment with the solvent, the mixture of the glycerine and solvent
18 allowed to rest until the complete separation of the impurities has taken place
The glycerine is then withdrawn and any slight trace of the solvent remaining
therein can be driven off by currents of superheated steam, or otherwise
Then,
by concentration to about fifty (50) or fifty two (52) degrees Twaddell, it can be
rendered fit for use in the manufacture of dynamite, or for other purposes.
Having thus fully described my improved process, I wish it understood that,
although I consider the treatment of glycerine contained in soap-ley as the most
important application of my invention, yet the said invention is applicable to the
treatment of crude glycerine obtained from other sources. I also wish it under-
stood that I am aware that a process is already known for treating the crude
glycerine obtained from spent ley to remove all disagreeable smell or taste before
hually distilling such crude glycerine. But my process differs from such former
process in respect of the fact that, whereas, in the said former process, the glycerine
is treated with the solvent before distillation and while containing a large quantity
of common salt and other impurities. I do not treat the glycerine with a solvent

page_text: until after distillation, I thus ensure great economy in the use of the solvent, for,
while, in the said former process, the quantity of the solvent required is about
thirty-three per cent of the material treated thereby, in my process the quantity
of solvent required is only about from ten to fifteen per cent of the glycerine, and
I wish it understood that I claim
The above described improved process in which the crude glycerine is first
distilled to free it from salt, and then treated with a solvent, as, and for the
purposes, specified