Improvements in the Production of Acid Sulphates.
Year: 1890

page_text: Date of Application, 31st July, 1890
Complete Specification Left, 30th Apr., 1891-Accepted, 6th June, 1891
PROVISIONAL SPECIFICATION.
Improvements in the Production of Acid Sulphates.
WILLIAM BRANTINGHAM GILES Belmont Villa Leyton Essex FREDERICK
GEORGE ADAIR ROBERTS of Lion House Stamford Hill Middlesex, ARTHUR
BOAKE of Southwood Lawn Highgate Middlesex Chemists do hereby declare the
nature of this invention to be as follows:-
In the manufacture of nitric, acetic & hydrochloric acids large quantities of acid
sulphates of sodium are obtained as bye products which are at the present time of
very little value.
We have discovered that these acid sulphates are capable of
being combined with much more sulphuric acid than they already contain giving
rise to a new compound which we term pentasulphate of sodium and which
possesses approximately the empirical formula of Na, 5 SO, +3 aq. This body is
solid at all ordinary temperatures and from its properties can be applied to many
useful purposes in the arts.
In carrying out this invention we take nitrate or acctate or chloride of sodium &
add to them such a quantity of sulphuric acid in excess of the amount generally
employed for their deconiposition that on heating in the usual manner the nitric
acetic or hydrochloric acids are expelled & the required pentasulphate of sodium is
left. Or we take the acid cake resulting from the decomposition of the above salts
when the usual amount of acid has been employed, & heat it with the requisite
excess of sulphuric acid till combination ensues & the pentasulphate of sodium is
formed.
Dated this 29th day of July 1890.
WM. BRANTINGHAM GILES.
F. G. ADAIR ROBERTS.
A
DAA
COMPLETE SPECIFICATION.
Improvements in the Production of Acid Sulphates.
We WILLIAM BRANTINGHAM GILES of 9 Belmont Villas Leyton Essex
FREDERICK GEORGE ADAIR ROBERTS of Lion House Stamford Hill Middlesex
and ARTHUR BOAKE of Southwood Lawn Highgate Middlesex Chemists 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 :-
In the manufacture of nitric, acetic and hydrochloric acids large quantities of
acid sulphates of sodium are obtained as bye products which are at the present
time of very little value. We have discovered that these acid sulphates are
capable of being combined with much more sulphuric acid than they already
contain giving rise to a new compound which we term pentasulphate of sodium and
which possesses approximately the empirical formula of Na,O5 SO, +3 aq. This.
body is solid at all ordinary temperatures and from its properties can be applied to
many useful purposes in the arts.
In carrying out this invention we take nitrate or acetate or chloride of sodium
and add to them such a quantity of sulphuric acid in excess of the amount generally
employed for their decomposition that on heating in the usual manner the nitric
acetic or hydrochloric acids with any excess of water are expelled and the required
pentasulphate of sodium is left.

page_text: This operation is carried out in cylinders retorts or pots generally of cast iron,
heated either by fire or steam or in brick or fireclay ovens or furnaces. Or we
take either bisulphate of sodium or the acid cake resulting from the decomposition
of the above salts when the usual amount of acid has been employed and heat it
preferably in cast iron pots set in a furnace and provided with stirring gear with
the requisite excess of sulphuric acid till combination ensues and the pentasulphate
of sodium is formed.
The fused material is then run out either into iron casks as is usual with caustic
soda or if it is desired to have it in detached picces into iron moulds where it is
allowed to solidify then while it is still hot it is broken into pieces and packed in
iron or other suitable packages.
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:
1st. The invention and production of the above mentioned new salt viz. penta-
sulphate of sodium from ordinary (NaHSO) or anhydrous (Na,O, 2 SO,) bisulphate,
or less acid sulphates of sodium substantially as above described.
2nd. The conversion of the acid sulphates of sodium obtained as bye products in
the manufacture of nitric acetic or hydrochloric acids (which at the present time
have little or no value) into a new and useful product which is a solid dry material
capable of being packed and transported in ordinary packages such as iron drums
or keys.
Dated this 29th day of April 1891.
A. BOAKE.
F. G. ADAIR ROBERTS.
WM.
BRANTINGHAM GILES.