An Improved Process of Decolourizing and Clarifying Tanning Liquors or Tannic Extracts.
Year: 1891

page_text: Date of Application, 24th Apr., 1891
Complete Specification Left, 19th Jan., 1892-Accepted, 2nd Apr., 1892
PROVISIONAL SPECIFICATION.
An Improved Process of Decolourizing and Clarifying Tanning
Liquors or Tannic Extracts.
I, ALPHONSE HUILLARD, of 95 Boulevard Beaumarchais Paris in the Republic
of France, do hereby declare the nature of this invention to be as follows:-
My invention relates to a process of decolourizing and clarifying tanning liquors
or tannic extracts.
This process is applicable to any kind of tanning liquors or tannic extracts
whether these are obtained from wood, such as chestnut, oak, from sumach or other
leaves, or from bark, pods and the like.
The improved process consists essentially in treating the liquors (which mark on
an average from 2 to 3 degrees Baumé) from the tubs or vats of the exhausting
batteries by a certain quantity of a derivative of strontium, such as strontium hydrate,
anhydrous strontia, strontium carbonate or other strontium salt.
The proportion employed varies according to the degree of decolouration which
is to be attained and the degree of concentration of the tanning solutions.
The derivative of strontium chosen may be added either in a hot or cold state,
but preferably cold.
The liquors which are dim prior to the application of the process, become at once
limpid, the strontia precipitating the colouring matters which they contain.
This precipitation having been carried out the filtering is effected; then a small
quantity of sulphuric acid is added to remove the excess of strontia which may have
remained in the solution.
After further filtration or decantation the liquors are concentrated in a vacuum
to 20 or 30 degrees Baumé.
The process hereinbefore described can be applied as well to ordinary liquors as
to liquors already concentrated.
11
11001
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.
COMPLETE SPECIFICATION.
An Improved Process of Decolourizing and Clarifying Tanning
Liquors or Tannic Extracts.
I, ALPHONSE HUILLARD, of 95 Boulevard Beaumarchais Paris, in the Republic
of France, 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 decolourizing and clarifying tanning liquors
or tannic extracts.
This process is applicable to any kind of tanning liquors or tannic extracts
whether these are obtained from wood, such as chestnut, oak, from sumach or other
leaves, or from bark, pods and the like.
The improved process consists essentially in treating the liquors (which mark on
an average from 2 to 3 degrees Baumé) from the tubs or vats of the exhausting
batteries by a certain quantity of a derivative of strontium, such as strontium
hydrate, anhydrous strontia, strontium carbonate or other strontium salt.
The proportion employed varies according to the degree of decolouration which
is to be attained and the degree of concentration of the tanning solutions.

page_text: The derivative of strontium chosen may be added either in a hot or cold state,
but preferably cold.
The liquors which are dim prior to the application of the process, become at once
limpid, the strontia precipitating the colouring matters which they contain.
This precipitation having been carried out the filtering is effected; then a small
quantity of sulphuric acid is added to remove the excess of strontia which may have
remained in the solution.
"
After further filtration or decantation the liquors are concentrated in a vacuum
to 20 or 30 degrees Baumé.
The process hereinbefore described can be applied as well to ordinary liquors as
to liquors already concentrated.
Having now particularly described and ascertained the nature of my saiḍ
invention, and in what manner the same is to be performed, I declare that what I
claim is
The herein described improved process of decolouring and clarifying tannic
extracts, specially characterized by the employment of a derivative of strontium,
such as strontium hydrate, anhydrous strontia, strontium carbonate or other salt of
this base.
Dated this 19th day of January 1892.
>
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.