Year: 1895

page_text: We, Dr. ALWIN GOLDBERG, of Chemnitz, and Dr. WILHELM SIEPERMANN,
of Elberfeld, both in the German Empire, Chemists, do hereby declare the nature
of this invention to be as follows:-
This invention relates to an improved process for the preparation of sulpho-
cyanides.
In the process employed up to the present for the preparation of sulphocyanides
or rhodanides by heating bisulphide of carbon and aqueous ammonia, sulphuretted
hydrogen or a small quantity of sulphur and metallic sulphide is obtained as a
by-product.
According to our invention in order to prevent the unpleasant formation of
sulphuretted hydrogen and to obtain the sulphur in a commercial form, the reaction
is performed with the addition of sulphites or byposulphites of the corresponding
alkalies or alkaline earths, or ammonia or magnesia.
Instead of the sulphites or hyposulphites the free bases could be used if, in place
of the ammonia, an equivalent quantity of sulphite or hyposulphite of ammonia.
were used, as the latter salts are instantly decomposed by the said bases, whereby
the same result would be obtained.
The reactions that take place are represented by the following equations :
According to these reactions not only is the half of the sulphur contained in the
carbon disulphide, with the help of the sulphite or hyposulphite, but also the
sulphur of the sulphite or hyposulphite set free.
The reagents are used in quantities represented by the equations.
The reaction advantageously takes place in a vessel under pressure at 100° C.
but is hastened considerably by increasing the temperature to 120-130°. Stirring
also hastens the reaction especially in the case of sulphates of alkaline earths that
are with difficulty dissolved. The sulphur set free by the reaction collects in a
molten condition under the sulphocyanide solution in course of formation.
Any impurities occasioned by impure sulphites or hyposulphites may be easily
removed by the addition of an equivalent quantity of sulphocyanide of barium.
D

page_text: It is not necessary to use pure carbon disulphide as products containing
bisulphide of carbon obtained in the distillation of tar or similar substances may
be used.
Dated the 15th day of January 1895.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.
An Improved Process for the Preparation of Sulphocyanides.
We, Dr. ALWIN GOLDBERG, of 46 II, Mühlenstrasse, Chemnitz, and
Dr. WILHELM SIEPERMANN, of 116, Königstrasse, Elberfeld, both in the
German Empire, 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 :-
This invention relates to an improved process for the preparation of sulpho-
cyanides.
In the process employed till now for the preparation of sulphocyanides or
rhodanides by heating bisulphide of carbon and aqueous ammonia, sulphuretted
hydrogen or a small quantity of sulphur and sulphuret is obtained as a by-
product.
According to our invention in order to prevent the unpleasant formation of
sulphuretted hydrogen and to obtain the sulphur in a commercial form, the reaction
is performed with the addition of sulphites or hyposulphites of the corresponding
alkalies or alkaline earths, or ammonia or magnesia.
Instead of the sulphites or hyposulphites the free bases could be used if, in place
of the ammonia, an equivalent quantity of sulphite or hyposulphite of ammonia
were used, as the latter salts are instantly decomposed by the said bases, whereby
the same result would be obtained.
The reactions that take place are represented by the following equations :
According to these reactions not only is the half of the sulphur contained in the
bisulphide of carbon with the help of the sulphite or hyposulphite, but also the
sulphur of the sulphites or byposulphites set free.
The reagents are used in quantities represented by the equations.
The reaction advantageously takes place in a vessel under pressure at 100° C.
but is hastened considerably by increasing the temperature to 120-130°. Stirring
also hastens the reaction especially in the case of sulphites of alkaline earths that
are with difficulty dissolved. The sulphur set free by the reaction collects in a
molten condition under the sulphocyanide solution in course of formation. .

page_text: Any impurities of the sulphites or hyposulphites occasioned by sulphates may be
easily removed by the addition of an equivalent quantity of sulphocyanide of
barium.
It is not necessary to use pure bisulphide of carbon as products containing
bisulphide of carbon obtained in the distillation of tar or similar substances may
be used.
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 :-
:-
An improved process for the preparation of sulphocyanides of the alkalies of
ammonia, of magnesia and of the alkaline earths and for the direct preparation of
sulphur by heating bisulphide of carbon with ammonia and the sulphites or hypo-
sulphites of the base the sulphocyanide of which it is desired to prepare.
Dated the 14th day of October 1895
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.