IMPROVEMENTS IN APPARATUS FOR THE MANUFACTURE OF BICARBONATE OF SODA
Year: 1880

page_text: LETTERS PATENT to Walter Weldon, of Rede Hall, Burstow, in the County
of Surrey, for an Invention of "IMPROVEMENTS IN APPARATUS FOR THE
MANUFACTURE OF BICARBONATE OF SODA." A communication from abroad
by Alfred Rangod Pechiney, of Salindres, in the Republic of France.
PROVISIONAL SPECIFICATION left by Walter Weldon at the Office of the
Commissioners of Patents on the 23rd December 1880.
WALTER WELDON, of Rede Hall, Burstow, in the County of Surrey.
"IMPROVEMENTS IN APPARATUS FOR THE MANUFACTURE OF BICARBONATE OF
SODA." A communication from abroad by Alfred Rangod Pechiney, of Salindres,
in the Republic of France.
This Invention relates to apparatus in which to perform the treatment of a
mixed solution of chloride of sodium and ammonia or carbonate of ammonia by
carbonic acid gas or a mixture of carbonic acid gas and other gases in order to
the formation from the chloride of sodium of bicarbonate of soda, and it consists in
a certain modification of an apparatus for which Her Majesty's Letters Patent
bearing date the 24th May of the current year, and numbered 2098, have been
granted to me.
In the Specifications of the Patent aforesaid an apparatus is described, one of the
main features of which is a horizontal cylinder divided internally into compart-
ments by means of one horizontal diaphragm and a number of vertical diaphragms,
the said horizontal diaphragm being perforated with a large number of holes. The
present Invention consists in substituting for the said horizontal perforated
diaphragm two horizontal perforated diaphragms placed at a little distance apart,
and in so disposing the tubes for conveying into the cylinder the carbonic acid gas
or mixture of carbonic acid and other gases that the said gas or mixture of gases
shall pass into the space between the two diaphragms. Each time the cylinder
makes a semi-revolution its liquid contents have thus to pass downwards, and its
gaseous contents to pass upwards through the holes in two diaphragms instead of
one only, and the contact between the liquid contents and the gaseous contents is
thus rendered very much more intimate and effective.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Walter Weldon in the Great Seal Patent Office on the 22nd June
1881.
WALTER WELDON, of Rede Hall, Burstow, in the County of Surrey.
"IMPROVEMENTS IN APPARATUS FOR THE MANUFACTURE OF BICARBONATE OF
SODA." A communication from abroad from Alfred Rangod Pechiney, of Salindres,
in the Republic of France.
This Invention relates to apparatus in which to perform the treatment of a
mixed solution of chloride of sodium and either free ammonia or carbonate of
ammonia by either carbonic acid gas or a mixture of carbonic acid gas and other
gases in order to the transformation of the chloride of sodium of such mixed
solution into bicarbonate of soda, and it consists in a certain modification of an
apparatus for which Her Majesty's Letters Patent, numbered 2098, and bearing
date the Twenty-fourth of May 1880, have been granted to me.
In the Specifications of the Patent aforesaid an apparatus is described, one of
the main features of which is a horizontal cylinder divided internally into compart-
ments by means of one horizontal diaphragm and a number of vertical diaphragms,
the said horizontal diaphragm being perforated with a large number of holes. The
present Invention consists in substituting for the said horizontal perforated
diaphragm two horizontal perforated diaphragms placed a little apart from each
other, as shown in Figures 1 and (two) 2 of the accompanying Sheet of Drawings, in
which the said horizontal cylinder is marked A, and the said two horizontal
perforated diaphragms are respectively marked b, 61. The apparatus is otherwise
disposed and arranged, as is described in the Specification of the former Patent
aforesaid, except that the gases passing into the cylinder A through the trunnion B,
Figure 2, pass into those of the compartments formed by the vertical diaphragms
marked a, which they respectively enter at the part thereof which is situated
between the two horizontal perforated diaphragms, the employment of which
constitute the present Invention. As those dispositions and arrangements are fully
described in the Specification of the Patent numbered 2098 of the year 1880, and
constitute no part of the present Invention, it is unnecessary to describe them here,
although they are shown on the accompanying Sheet of Drawings, the lettering on
which for the most part corresponds with that on the Sheet of Drawings which
accompanies the final Specification of the said former Patent, and is fully described
therein. The advantage gained by the present Invention is that each time that
the cylinder A makes sudden semi-revolution, its liquid contents have to pass in
one direction and its gaseous contents in the other direction through two perforated
diaphragms and that the contact of its liquid contents with its gaseous contents
is thus rendered much more close and intimate than when only one horizontal
perforated diaphragm is employed.
In witness whereof, I, the said Walter Weldon, have hereunto set my hand
and seal, this Twenty first day of June, in the year of our Lord One thousand
eight hundred and eighty one.
WALTER WELDON. (L.S.)