IMPROVEMENTS IN BLEACHING
Year: 1884

page_text: I, JACOB BAYNES THOMPSON, of New Cross, in the County of Kent, Chemist,
do hereby declare the nature of said invention for IMPROVEMENTS IN BLEACHING,
to be as follows:-
My present improvements relate to the process of bleaching described in the
specification of my British Letters Patent, N° 595, dated 3rd February 1883. In
such specification I described the use of an atmosphere of carbonic acid gas, in a
closed vessel, for the purpose of decomposing the chloride of lime solution.
Now, according to my present improvements, I can use a mixed atmosphere
composed of atmospheric air with its ordinary proportion of carbonic acid gas or
with a greater proportion of carbonic acid gas, either in a closed vessel, under
pressure, or in an open vessel. When, however, I employ an open vessel the
material undergoing treatment is allowed to remain, in such vessel, a longer time
than when a closed vessel is used. The cloth, or other material, to be treated, is
previously moistened or wetted with a solution of chloride of lime, or other similar
bleaching solution, as described in my specification before referred to.

page_text: I, JACOB BAYNES THOMPSON, of New Cross, in the County of Kent, Chemist,
do hereby declare the nature of said Invention for IMPROVEMENTS IN BLEACHING,
and in what manner the same is to be performed to be particularly described and
ascertained in and by the following statement, that is to say:-
My present improvements relate to the process of bleaching described by me in
the specification of my British Letters Patent, No 595, dated 3rd day of February
1883. In such specification I described the use of an atmosphere of carbonic acid
gas, in a closed vessel, in which the bleaching is effected, for the purpose of
decomposing the chloride of lime solution.
Now, as a result of further experiment, I find that the bleaching of vegetable
fibres and fabrics can be effected (although not in quite so expeditious nor
economical a manner) by alternately saturating the material to be bleached, in a
closed vessel, with a solution of chloride of lime (preferably about 1/8° Tw :) with-
drawing the same and submitting it to the action of a mixed atmosphere composed
of atmospheric air with its ordinary proportion of carbonic acid gas or with a
greater proportion of carbonic acid gas.
I have also discovered that the bleaching of vegetable fibres and fabrics can be
effected in an open vessel, by alternately saturating the material with a solution of
chloride of lime (preferably at a strength of 1° Tw :), withdrawing the same and
submitting it to the action of an atmosphere of pure carbonic acid gas, or of a
mixed atmosphere composed of atmospheric air with its ordinary proportion of
carbonic acid gas, or with a greater proportion of carbonic acid gas.
When various proportions of air and carbonic acid gas are used, I prefer to draw
them through the material under treatment, by any suitable means, such for
instance as a fan, a pump, or other exhauster.
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 :-
The process, substantially as herein described, of bleaching vegetable fibres and
fabrics, the same consisting in alternately treating the said fibres or fabrics with a
solution of chloride of lime, in a closed vessel, or in an open vessel, then with-
drawing said solution, and then treating with an atmosphere of carbonic acid gas
or with various proportions of atmospheric air and carbonic acid gas, in the manuer
herein stated.
DAL! FAL 1.
....