Year: 1899

page_text: I, THADDÉE GLADY S7, of Montiedon, near Marseilles, in the Republic of France
Chemist, do hereby declare the nature of this invention to be as follows
-
This invention relates to the manufacture of commercial cream of tartar and
18 based on the following considerations
-
If an alkaline bisulphite, such as bisulphite of sodium, is poured into an
hydrochloric solution, saturated in a cold state with a mixture of tartrate of
calcium and of bitarti ate of potassium, a fine and granulous precipitate, consist-
ing of bitartrate of potassium, will be formed in a short time.
Again, if to an hydrochlone solution, saturated in a cold state with a mixture
of tartrate of calcium and of bitartrate of potassium, a quantity of hydrated lime
equivalent to the potash contained in the mixture be added, and if a curent of
sulphurous gas, cold and in a state of saturation, be caused to pass through the
said mixture, a granulous precipitate consisting of bitartrate of potassium will
be formed
Further, if to a sulphurous solution, saturated in a cold state with tartrate of
calcium, a quantity of chloride of potassium equivalent to the tartrate be added,
and the mixture agitated, all heating being avoided, a granulous precipitate of
bitartrate of potassium will be formed
From the above considerations it will readily be understood, that the object
of industrial operations may be either to extract the bitartrate previously existing
in the lres and tartais, by separating it from the tartrate, or whilst extracting
the pre-existing bitailiate, to convert the greater portion of the tartiate into
bitartrate
In either case the operative method is the same, the only difference being the
addition of chloride of potassium in sufficient quantity to effect the conversion of
the tartrate into bitartrate
When in the manufacture I confine myself to extracting the bitartrate pre-
existing in the lyes and taitais (by which means I am enabled to treat lyes con-
taining only 10 to 15% of bitartrate) I commence by preparing hydrochloric
liquors saturated in a cold state
This result 18 readily obtained by proceeding to the systematic exhaustion of
the lyes on tartars. By this means saturated liquors in a limpid state are obtained
which is an indispensable condition if good results are to be obtained
Liquors at 180 -20° Baumé may be treated with two kinds of reagents, for
example the alkaline bisulphites such as bisulphite of sodium or alkaline earths
such as hydrate of lime
The operation with bisulphite of sodium 18 of extreme simplicity It will of
course be understood that the operative should know what is the constituent pro-
portion of potash and of tartaric acid in the liquors with which he is dealing, and
he should also be acquainted with the composition of the bisulphite, in order

page_text: that he may obtain the best relative quantities for the ingredients and the best
yield, the mixture of the reagents should not be effected in lead vessels
When the mixing has been effected in a cold state in closed vessels, the bitar-
trate rapidly becomes deposited, and if the conect relative proportions for the
ingredients has been found the product will be free from salts of lime. The
floating liquid 18 decanted This liquid, charged with sulphurous gas, contains
the whole of the tartrate of calcium, and also a small quantity of bitartrate which
has escaped the reaction
The sulphurous gas is recuperated by means of steam and used again for the
preparation of bisulphite, whilst the tai talic salts are employed in the manufacture
of tartaric acid
As regards the bitartrate obtained, it is treated in a hydio-extractor, washed
with cold water saturated with bitai tiate, and dried in a drving oven.
The product constitutes a white, crystalline powder titrating 98-99%
Where it is desued to substitute hydrate of hime for the alkaline lisulphite,
the portion of the lime should be carefully regulated with reference to the
proportion of potash in the liquois The hydrate of lime should be mixed as
intimately as possible with the tai tanc liquors and the mixture allowed to cool
The sulphitation of the mixture should be carefully watched in order to obviate
heating. After saturation has taken place, the floating liquid charged with
sulphurous gas is decanted This sulphuious gas is recuperated by means of steam
and conducted into cold water absorbers, whilst the liquors containing the tartrate
of calcium and the bitartrate which has escaped the ieaction are utilised for the
manufacture of tartaric acid.
As regards the precipitated bitartrate, it is treated in an hydro extractor, washed
and dried. Having been prepared in this manner in the first operation, it usually
contains a small quantity of tartrate of lime and titiates 94-95%; I refine it
by washing it in a closed vessel, with sulphurous water at 4° Baumé After this
washing, the bitartrate having been again washed in cold water and dried,
litrates 98%.
I, THADDÉE GLADYSZ, of Montiedon, near Marseilles, in the Republic of France
Chemist, 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
-
This invention relates to the manufacture of commercial cream of tartar and
18 based on the following considerations
-
If an alkaline bisulphite, such as bisulphite of sodium, 18 poured into an
hydrochloric solution, saturated in a cold state with a mixture of tartiate of
calcium and of bitartrate of potassium, a fine and granulous precipitate, consist-
ing of bitartrate of potassium, will be formed in a short time
Again, it to an hydrochlone solution, saturated in a cold state with a mixture
of tartrate of calcium and of bitartrate of potassium, a quantity of hydrated lime
equivalent to the potash contained in the mixture be added, and if a current of

page_text: sulphurous gas, cold and in a state of saturation, be caused to pass through the
said mixture, a granulous precipitate consisting of bitartrate of potassium will
be formed
Further, if to a sulphurous solution, saturated in a cold state with tartrate of
calcium, a quantity of chloride of potassium equivalent to the tartrate be added,
and the mixture agitated, all heating being avoided, a granulous precipitate of
bitartrate of potassium will be formed.
1
From the above considerations it will readily be understood, that the object
of industrial operations may be either to extract the bitartrate previously existing
in the lyes and tartais, by separating it from the tartiate, or whilst extracting
the pre-existing bitartrate, to convert the greater portion of the taitrate into
bitartrate.
In either case the operative method is the same, the only difference being the
addition of chloride of potassium in sufficient quantity to effect the conversion of
the tartrate into bitartrate
When in the manufacture I confine myself to extracting the bitartrate pre-
existing in the lyes and tartars (by which means I am enabled to treat yes con-
taining only 10 to 15% of bitartrate) I commence by preparing hydrochloric
liquors saturated in a cold state
This result is readily obtained by proceeding to the systematic exhaustion of
the lyes or tartars By this means saturated liquois in a limpid state are obtained
which is an indispensable condition if good results are to be obtained
Liquors at 18° 20° Baumé may be treated with two kinds of reagents; for
example the alkaline bisulphites such as bisulphite of sodium or alkaline earths
such as hydrate of lime.
The operation with bisulphite of sodium is of extreme simplicity. It will of
course be understood that the operative should know what is the constituent pro-
portion of potash and of tartaric acid in the liquors with which he is dealing, and
he should also he acquainted with the composition of the bisulphite, in order
that he may obtain the best relative quantities for the ingredients and the best
Field, the mixture of the reagents should not be effected in lead vessels
The
When the mixing has been effected in a cold state in closed vessels, the bitar-
trate rapidly becomes deposited, and if the correct relative proportions for the
ingrediente has been found the product will be free from salt of lime
floating liquid is decanted This liquid, charged with sulphurous gas, contains
the whole of the tartrate of calcium, and also a small quantity of bitartrate which
has escaped the reaction.
The sulphurous gas is recuperated by means of steam and used again for the
preparation of bisulphite, whilst the tartane salts are employed in the manufacture
of tartaric acid
As regards the bitartrate obtained, it is treated in a hydro-extractor, washed
with cold water saturated with bitartrate, and dried in a drying oven
The product constitutes a white, crystalline powder titrating 98-99%
Where it is desired to substitute hydrate of lime for the alkaline bisulphite
the portion of the lime should be carefully regulated with reference to the
proportion of potash in the liquors The hydrate of lime should be mixed as
intimately as possible with the tartaric liquors and the mixture allowed to cool
The sulphitation of the mixture should be carefully watched in order to obviate
heating After saturation has taken place, the floating liquid charged with
sulphurous gas is decanted This sulphurous gas 18 recuperated by means of steam
and conducted into cold water absorbers, whilst the liquois containing the tartrate
of calcium and the bitartrate which has escaped the reaction are utilised for the
manufacture of tartaric acid
As regards the precipitated bitartrate, it is treated in an hvdio extractor, washed
and dried. Having been prepared in this manner in the first operation, it usually
contains a small quantity of tartrate of lime and titrates 94-95%. I refine it
by washing it in a closed vessel, with sulphurous water at 4° Baumé After this

page_text: washing, the bitartrate having been again washed in cold water and dried,
titrates 98%.
Having now particularly described and ascertained the nature of my said in-
vention and in what manner the same is to be performed, I declare that what
I claim is: —
1 The extraction of the bitartrate of potassium from lyes and tartars and its
separation from the taitiate of lime by means of alkaline bisulphite or of alkaline
earths and of sulphurous acid
2. The conversion of the tartrate of calcium into bitartrate by means of these
same reagents with the addition of chloride of potassium.
HASELTINE, LAKE & Co,
45, Southampton Buildings, London, W.C., Agents for the Applicant