Improvements in the Manufacture of Alpha Oxyuvitic Acid.
Year: 1892

page_text: Date of Application, 4th May, 1892
Complete Specification Left, 1st Feb., 1893-Accepted, 11th Mar., 1893
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Alpha Oxyuvitic Acid.
I JAMES YATE JOHNSON of 47 Lincoln's Inn Fields in the County of Middlesex
Gentleman do hereby declare the nature of this invention (which has been com-
municated to me from abroad by Dr. F. von Heyden Nachfolger, of Radebeul
Dear Dresden in the Kingdom of Saxony) to be as follows:-
It has not heretofore been possible to manufacture alpha oxyuvitic acid on a
large or commercial scale. This acid has been obtained in chemical laboratories
from amido uvitic acid with the aid of nitrous acid and from sulpho-uvitic acid
with the alkali melt.
My foreign correspondents have now discovered that this acid can be easily
prepared on a large scale by causing carbonic acid to act upon alkaline or earthy
alkaline combinations of orthocresol at temperatures of not less than 160 degrees
centegrade. At temperatures under 160 degrees centigrade ortho cresol mono
carbon acid C, H, CH, OH COOH is formed as already known but at
temperatures over 160 degrees centigrade a mixture of this acid with alpha uvitic
acid C, H, CH, OH COOH COOH is obtained whilst at temperatures above
2
1
3
2
5
210 degrees the latter only is obtained..
3
The process is conducted with good results by proceeding as next hereinafter
described but the invention is not limited as to details.
pressure.
Dry carbonic acid is pressed or forced to saturation into dry cresolate of
potash heated to about 220 degrees centigrade in a vessel capable of withstanding
The materials, are then allowed to cool and the product of the reaction
is dissolved in water. By means of hydrochloric acid alpha oxyuvitic acid (the
melting point of which is about 290 degrees centigrade) can be precipitated from
the solution. This product may be purified from any cresotinic acid that may be
mixed with it by partial precipitation of the solution of a salt of the acid. In this
process the ortho cresolate of potash may be replaced by another alkaline or
earthy alkaline salt of ortho cresol. By saturating the heated cresol salt with
carbonic acid at atmospheric pressure in place of in a closed vessel as hereinbefore
described a smaller yield of oxy uvitic acid is obtained.
The acid manufactured according to this invention is useful in the manufacture
of dyes or colouring matters..
Dad thin 1th daw of Mow 1000
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, London.
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Alpha Oxyuvitic Acid.
I JAMES YATE JOHNSON of 47 Lincoln's Inn Fields in the County of Middlesex
Gentleman do hereby declare the nature of this invention (which has been com-
municated to me from abroad by Dr. F. von Heyden Nachfolger of Radebeul
near Dresden in the Kingdom of Saxony) and in what manner the same is to be
performed to be particularly described and ascertained in and by the following
statement:-
It has not heretofore been possible to manufacture alpha-oxyuvitic acid on a
large or commercial scale. This acid has been obtained in chemical laboratories

page_text: from amido-uvitic acid with the aid of nitrous acid and from sulpho-uvitic acid
with the alkali melt.
My foreign correspondents have now discovered that alpha-oxyuvitic acid can be
easily prepared on a large or commercial scale by causing carbonic acid to act
upon alkaline or earthy alkaline combinations of ortho-cresol at temperatures of
not less than 160 degrees centigrade. At temperatures under 160 degrees
centigrade ortho-cresol-mono-carbon acid (C, H, CH, OH COOH) is formed
1 2
3
as already known but at temperatures over 160 degrees centigrade a mixture of
this acid with alpha oxyuvitic acid (C, H, CH, OH COOH COOH) is obtained
2
3
5
whilst at temperatures above 210 degrees the latter only is obtained.
The process is conducted with good results by proceeding as next hereinafter
described but the invention is not limited to the precise details which I shall give.
Dry carbonic acid is pressed or forced to saturation into dry ortho-cresolate of
potash heated to about 220 degrees centigrade in a vessel capable of withstanding
pressure. The materials are then allowed to cool and the product of the reaction
is dissolved in water. By means of hydrochloric acid alpha-oxyuvitic acid (the
melting point of which is about 290 degrees centigrade) can be precipitated from
the solution. By partial precipitation of the solution of a salt of the acid the
alpha-oxyuvitic acid may be purified from any cresotinic acid that may be mixed
with it.
In this process the ortho-cresolate of potash may be replaced by another
alkaline or earthy alkaline salt of ortho-cresol. By saturating the heated cresol
salt with carbonic acid at atmospheric pressure in place of in a closed vessel as
hereinbefore described, a smaller yield of alpha-oxy-uvitic acid is obtained.
The acid manufactured according to this invention is useful in the manufacture
of dyes or colouring matters.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what T
claim is :-
1. The manufacture of alpha oxyuvitic acid by the action of carbonic acid
upon alkaline or earthy alkaline salts of cresol at temperatures not lower than
160 degrees centigrade (preferably at 220 degrees centigrade) substantially as
hereinbefore described.
2. As a new article of manufacture the alpha ovyuvitic acid manufactured as
hereinbefore described.
Dated this 1st day of February 1893.
J.. H. JOHNSON & Co.,
Agents.