Improvements in the Manufacture of Bleaching Compounds.
Year: 1896

page_text: Date of Application, 14th Oct., 1896
Complete Specification Left, 3rd Aug., 1897- Accepted; 11th Sept., 1897
PROVISIONAL SPECIFICATION..
Improvements in the Manufacture of Bleaching Compounds.
I, JAMES WARNE CHENHALL of Dart Villas Totnes, County of Devon England,
Civil Engineer and Metallurgist, do hereby declare the nature of this invention to
be as follows:
My invention consists in the method of manufacturing bleaching compounds
composed of caustic potash and chlorine, carbonate or bicarbonate of potash and
chlorine, caustic soda and chlorine, carbonate or bicarbonate of soda and chlorine.
In carrying my invention into practise I proceed as follows:-I pass chlorine gas
(which may be generated by any of the well known methods) through a cold
solution of carbonate or bicarbonate of potash or caustic potash, or a solution of
carbonate or bicarbonate of soda or caustic soda.
The strength of the solution I prefer to use is either one part of carbonate of
potash or one part of carbonate of soda to 8 (eight) parts of water, but any other
strength solution may be used, and to continue the flow of the chlorine gas through
the solution of carbonate of potash or carbonate of soda until the liquor begins to
effervesce or will not absorb any further chlorine.
I then take the solution of potash or soda saturated with chlorine gas, run it into
a suitable vessel in which the solution is agitated by any suitable mechanical
stirring apparatus. Fine carbonate or bicarbonate of potash or soda (whichever it
is intended to make either potash or soda bleaching compound) is then added slowly
until the whole mass is thickened to the consistency of dough when the whole
is then allowed to harden which it does by means of the dry potash or soda
absorbing the water and chlorine in the saturated solution of potash or soda and
chlorine gas.
In the cases where caustic potash or caustic soda is used in the manufacturing.
of these bleaching compounds, the solutions saturated with chlorine, of caustic
potash or caustic soda are treated in precisely the same manner as the saturated
solution of carbonate of potash or soda by adding dry carbonate with stirring.
Dated the 14th day October 1896.
JAMES WARNE CHENHALL,
Civil Engineeer and Metallurgist.
Improvements in the Manufacture of Bleaching Compounds.
I, JAMES WARNE CHENHALL of Dart Villas, Totnes, County of Devon, England,
Civil Engineer and Metallurgist, 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 consists in the method of manufacturing bleaching compounds

page_text: composed of caustic potash and chlorine carbonate or bicarbonate of potash and
chlorine caustic soda and chlorine, carbonate or bicarbonate of soda and chlorine.
In carrying my invention 'into practice I proceed as follows:-I pass chlorine gas
(which may be generated by any of the well known methods) through a cold solution
of carbonate or bi-carbonate of potash, or caustic potash, or a solution of carbonate
or bi-carbonate of soda, or caustic soda. The strength of the solution I prefer to
use is either one part of carbonate of soda to 8 (eight) parts of water, but any other
strength solution may be used, and to continue the flow of the chlorine gas through
the solution of carbonate of potash or carbonate of soda until the liquor begins to
effervesce or will not absorb any further chlorine. I then take the solution of potash
or soda saturated with chlorine gas, run it into a suitable vessel in which the
solution is agitated by any suitable mechanical stirring apparatus. Fine carbonate
or bi-carbonate of potash or soda (whichever it is intended to make either potash
or soda bleaching compound with) is then added slowly until the whole mass is
thickened to the consistency of dough when the whole is then allowed to harden, which
it does by means of the dry potash or soda absorbing the water and chlorine in the
saturated solution of potash or soda and chlorine gas.
In the cases where caustic potash or caustic soda is used in the manufacturing
of these bleaching compounds, the solution, saturated with chlorine, of caustic potash
or caustic soda is treated in precisely the same manner as the saturated solution
of carbonate of potash or soda by adding dry carbonate with stirring.
The advantages of the bleaching compounds herein described are the solidifying
of bleach liquors manufactured as aforesaid into hard compounds, such bleaching
compounds being in a suitable condition for transport to the consumer, and being
also free from the injurious action of lime upon the goods being bleached, as in the
case where chloride of lime is used.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is.
1. The solidifying of bleach liquors manufactured as herein described into hard
compounds.
2. The process herein specified, and consisting of the improvements in the
manufacture of bleaching compounds substantially as and for the purposes herein
mentioned.
Dated this 24th day of July 1807
JAMES WARNE CHENHALL.