Year: 1887

page_text: Date of Application, 18th July, 1887.
Specification Accepted, 19th Aug.. 1887.
1 CARL AUGUST BENNERT of Hebburn on Tyne in the County of Durham 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 has for its object the manufacture of coloring matters by treatment
with nitric acid of the coloring compounds or materials obtained by the processes
described in the Specification of my application for patent No. 13466 of 21st October
1886 and which are therein termed "Thiamines" and by treatment of the products
thus obtained with sulphonating agents or by treatment with nitric acid of the coloring
matters obtained by the processes described in the Specification of my application for
Patent No. 13473 of 21st October 1886 and which are therein terined "Thiamine-
sulphoacids."
I designate the products obtained from the Thiamines by treatment with nitric acid
"Thiaminines" and the sulphoacids of the Thiaminines either obtained by acting with
nitric acid upon the Thiaminesulphoacids or by acting upon the Thiaminines with
sulphonating agents I designate Thiamininesulphoacids.
The Thiamininesulphoacids are mostly coloring matters of various brownish shades
suitable for dyeing and printing.
The mode of performing my Invention will be clearly understood by the following
examples (the parts are by weight).
Example 15 parts of the product obtained by the process described under
Example IV in the Specification of my application for patent No. 13466 of
21st October 1886 are dissolved in 30 parts of concentrated sulphuric acid and to this
solution 20 parts of a cool mixture of concentrated nitric acid and concentrated
sulphuric acid containing about 35 per cent nitric acid of about 1-38 specific gravity
are slowly added whilst stirring and keeping the solution cool When the addition is
finished the mixture thus obtained is still kept cool for about 12 to 24 hours-The
solution may then be poured into about 5 times its volume of water and the product
thus obtained be filtered off.
Example I-5 parts of the product obtained by the process described under
Example of this Specification are slowly dissolved in 20 parts of sulphuric acid
containing about 20 per cent sulphurtrioxide and the solution is slowly heated up
to 60° centigrade (140° Fahrenheit) at which temperature it is kept for about
12 hours.
The solution may then be poured into about 5 times its volume of water and the
product thus obtained be filtered off.

page_text: Example III-5 parts of the product obtained by the process described under
Example IV in the Specification of my application for Patent No. 13466 of
21st October 1886 and treated as described under Example II in the Specification of
my application for patent No. 13473 of 21st October 1886 are dissolved in 20 parts
concentrated sulphuric acid and to this solution 20 parts of a cool mixture of con-
centrated nitric acid and concentrated sulphuric acid containing about 35 per cent
nitric acid of about 1.38 specific gravity are slowly added whilst stirring and keeping
the solution cool.
When the addition is finished the mixture thus obtained is still kept cool for about
12 to 24 hours.
The solution may then be poured into about 5 times its volume of water and the
product thus obtained be filtered off.
I have given the foregoing examples in order to clearly ascertain the nature of my
Invention and the manner in which the same may be performed without necessarily
limiting myself to the precise details given.
In the foregoing examples I have referred only to the product either obtained by
the process described under Example IV in the Specification of my application for
patent No. 13466 of 21st October 1886 or to the product obtained by treating such
product by the process described under Example II in the Specification of my appli-
cation for patent No. 13473 of 21st October 1886 but I have obtained good results
with all the Thiamines and Thiaminesulphoacids claimed in those Specifications.
I have likewise obtained good results by using instead of the given mixture of nitric
acid and sulphuric acid nitric acid alone or other mixtures of it with sulphuric acid
and also by using instead of sulphuric acid containing 20 per cent sulphurtrioxide
sulphuric acid containing more sulphurtrioxide or a corresponding quantity of meta-
phosphoric acid or chlorhydrosulphuric acid-by observing the precautions and making
the alterations which in such cases are known to be necessary as will be evident to
Chemists conversant with the manufacture of coloring matters.
The conditions of working with the other Thiamines and the other Thiaminesulpho-
acids are also similar to those described in the examples given and the directions
therein contained will enable Chemists to judge how best to proceed with such other
compounds.
Having now particularly described and ascertained the nature of my said Invention
and in what manner the same is to be performed 1 declare that what I claim is-
First The manufacture and use of the compounds herein referred to and termed
by me "Thiaminines" and "Thiamininesulphoacids" produced by acting with nitric
acid upon the products obtained by the processes described in the Specification of my
application for patent No. 13466 of 21st October 1886 and therein termed "Thiamines
or upon the products obtained by the processes described in the Specification of my
application for patent No. 13473 of 21st October 1886 and therein termed "Thiamine-
sulphoacids."
Second-The manufacture and use of the compounds herein referred to and termed
by me
"Thiamininesulphoacids" produced by acting with the sulphonating agents
above specified upon the compounds termed by me "Thiaminines."
66
Third The new products herein before referred to and termed "Thiaminines" and
Thiamininesulphoacids."