AN IMPROVED PROCESS OF TREATING THE SPENT LYES OF SOAP WORKS CHIEFLY FOR THE RECOVERY OF GLYCERINE THEREFROM
Year: 1882

page_text: LETTERS PATENT to Francis Henrick Tielke Allan of Warrington in the
County of Lancaster, Analytical Chemist for an invention of AN IMPROVED
PROCESS OF TREATING THE SPENT LYES OF SOAP WORKS CHIEFLY FOR THE
RECOVERY OF GLYCERINE THEREFROM
I
PROVISIONAL SPECIFICATION left by the said Francis Henrick Tielke
Allan at the Office of the Commissioners of Patents on the 24th May 1882.
FRANCIS HENRICK TIELKE ALLAN of Warrington in the County of Lancaster
Analytical Chemist AN IMPROVED PROCESS OF TREATING THE SPENT LYES OF
SOAP WORKS CHIEFLY FOR THE RECOVERY OF GLYCERINE THEREFROM
According to the said Invention I thoroughly spend the Lye and then neutralize
with any of the ordinary mineral acids then after settling I add a Solution of
Alum or pyroligneous Acid, or a solution of Chloride of Lime or I may add the
Alum or Chloride of Lime in the solid state and after stirring I allow to settle
again and leave a clear liquor or I may evaporate to nearly salting point before
adding any of these substances
After settling I remove the clear upper liquor and evaporate by any of the usual
methods to a concentrated condition and I finally distill the liquor in a retort or
still beated by super heated steam in the sides of the retort or still. The retort is
provided with a pipe at the bottom which carries off the precipitated Salt as it is
formed and the vessell being provided with supply and outlet taps the process is
continued

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Francis Henrick Tielke Allan in the Great Seal Patent Office on
the 22nd November 1882.
FRANCIS HENRICK TIELKE ALLAN of Warrington in the County of Lancaster
Analytical Chemist. "AN IMPROVED PROCESS OF TREATING THE SPENT LYES OF
SOAP WORKS, CHIEFLY FOR THE RECOVERY OF GLYCERINE THEREFROM."
In performing my invention I first, if necessary, neutralize the soap lye with any
ordinary mineral acid and agitate it, then, after settling I add a solution of alum
or I add solid chloride of lime (bleaching powder) or crude pyroligneous acid and
stir thoroughly or I may evaporate to nearly salting point before adding any of
the substances named above. I allow the precipitate to fall leaving a clear liquor
and after settling I draw off the clear upper liquor and evaporate to a concentrated
condition in pans (in which the heat is only applied at the sides) or I may
evaporate in shallow pans with sloping bottoms to which the heat is applied.
I finally distil this liquor in a glycerine retort having a current of superheated
steam within and provided with an exit pipe at the bottom which carries off the
precipitated salt as it accumulates.
Having stated the nature of my Invention and described the manner of
performing the same.
I declare that I claim.
The improved process of treating spent lyes of soap works which consists in
precipitating gelatinous and albuminous matters and other impurities contained
therein by the addition thereto of alum, chloride of lime, or crude pyroligneous
acid and withdrawing the said precipitate from the bottom of the retort, substan-
tially as and for the purpose herein described.
In witness whereof I the said Francis Henrick Tielke Allan have hereunto
set my hand and seal this eighteenth day of November One thousand eight
hundred and eighty two.
FRANCIS HENRICK TIELKE ALLAN
(LS)