A Process for Purifying Bleaching Liquor.
Year: 1892

page_text: Date of Application, 2nd June, 1892
Complete Specification Left, 28th Feb., 1893-Accepted, 6th May, 1893
PROVISIONAL SPECIFICATION.
A Process for Purifying Bleaching Liquor.
We, EUGENE HERMITE, EDWARD JAMES PATERSON, and CHARLES FRIEND
COOPER, all of Pownall Road, Dalston, in the County of Middlesex, Electrical
Engineers, do hereby declare the nature of this invention to be as follows:-
The liquor employed for bleaching textile fibres or pulps under electrolytic
action often becomes more or less charged with organic matters more or less
decomposable by the electric current, which thus is more or less wasted in
decomposing these matters instead of decomposing the chloride employed for
bleaching.
This invention relates to cheap and simple means of clearing the bleaching liquor
from such organic impurities, without adding anything that can interfere with the
bleaching process.
For this purpose, after the electrolysed liquid has produced its bleaching effect,
it is run into a tank provided with an agitator and has added to it first a quantity,
depending on circumstances, of iron perchloride as neutral as can be obtained,
then, after agitation, a quantity of gelatinous magnesia, such as is obtained by
precipitation.
After the mixture has settled until the liquid is quite clear, it is run off quite
freed from organic matters, and contains nothing beyond the substances first
employed except a small quantity of magnesium chloride.
In this process, acid perchlorides of iron should not be employed as they do not
thoroughly precipitate the organic matters.
The best perchloride found in the market is the sublimed material, but the
reagent which gives the most complete result is obtained by electrolytic action on
solution of protochloride of iron, the material thus obtained effecting complete
precipitation of organic matters and rendering the bleaching liquor as good as new.
This reagent may be cheaply and simply produced as follows.
To a certain quantity of protochloride of iron solution is added the bleaching
liquor produced electrolytically, until the protochloride is converted into perchloride.
The liquid thus produced effectually precipitates the organic matters of the bath
requiring only addition of a little gelatinous magnesia.
The protochloride of iron employed may be obtained from the liquors employed
in galvanising establishments for pickling by hydrochloric acid.
Dated this 2nd day of June 1892.
ABEL & IMRAY,
Agents for the Applicants.
COMPLETE SPECIFICATION.
A Process for Purifying Bleaching Liquor.
We EUGENE HERMITE, EDWARD JAMES PATERSON and CHARLES FRIEND
COOPER, all of Pownall Road, Dalston in the County of Middlesex, Electrical
Engineers, 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 :-
The liquor employed for bleaching textile fibres or pulps under electrolytic
action often becomes more or less charged with organic matters more or less
decomposable by the electric current, which thus is more or less wasted in
decomposing these matters instead of decomposing the chloride employed for
bleaching.

page_text: This invention relates to cheap and simple means of clearing the bleaching
liquor from such organic impurities, without adding anything that can interfere
with the bleaching process.
For this purpose, after the electrolysed liquid has produced its bleaching effect,
it is run into a tank provided with an agitator and has added to it first a quantity,
depending on circumstances, of iron perchloride as neutral as can be obtained,
then after agitation, a quantity of gelatinous magnesia, such as is obtained by
precipitation. After the mixture has settled until the liquid is quite clear, it is run
off quite freed from organic matters, and contains nothing beyond the substances
first employed except a small quantity of magnesium chloride.
In this process, acid perchlorides of iron should not be employed as they do not
thoroughly precipitate the organic matters. The best perchloride found in the
market is the sublimed material, but the reagent which gives the most complete
result is obtained by electrolytic action on solution of protochloride of iron, the
material thus obtained effecting complete precipitation of organic matters and
rendering the bleaching liquor as good as new.
This reagent may be cheaply and simply produced as follows:-
To a certain quantity of protochloride of iron solution is added the bleaching
liquor produced electrolytically, until the protochloride is converted into perchloride.
The liquid thus produced effectually precipitates the organic matters of the bath
requiring only addition of a little gelatinous magnesia.
The protochloride of iron employed may be obtained from the liquors employed
in galvanising establishments for pickling by hydrochloric acid.
The quantity of iron perchloride and magnesia employed may vary. Practically
we find good results from an addition of 1 to 3 litres of perchloride solution
at 32° Be., and to 1 kilo. of magnesia, to 1000 litres of the bleaching liquid.
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 :-
1. The herein described process for purifying bleaching liquor by adding to it
iron perchloride, as neutral as possible, and gelatinous magnesia and decanting the
liquor.
2. In the process above referred to, the substitution, for commercial iron
perchlorides, of the reagent obtained by electrolytic action on a solution of iron
protochloride.
3. In the process above referred to, the use of the reagent obtained by adding
to a solution of iron protochloride the bleaching liquor produced electrolytically.
Dated this 28th day of February 1893.
ABEL & IMRAY,
Agents for the Applicants.