A New or Improved Manufacture of Beta Naphthol Carbon Acid.
Year: 1889

page_text: Date of Application, 11th June, 1889
Complete Specification Left, 8th Mar., 1890-Accepted, 12th Apr., 1890
PROVISIONAL SPECIFICATION.
A New or Improved Manufacture of Beta Naphthol Carbon Acid.
I JAMES YATE JOHNSON of 47 Lincolns 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 the Chemical
Works Radebeul near Dresden Saxony German Empire to be as follows:--
This Invention has for its object the manufacture of a Beta Naphthol Carbon acid
of the melting point of 216 degrees Celsius by means of the reaction of carbonic aoid
upon the alkaline salts of the Beta Naphthol under pressure and at a temperature of
200 to 250 degrees Celsius.
The Beta Naphthol carbon acid (the production of which has been described in the
Specifications of Letters Patent No. 6134 and No. 81558) is produced if carbonio
acid is allowed to react on the alkaline salts of the Beta Naphthol under pressure and
at a temperature of 120 to 145 degrees Celsius.
The very inconstant acid thus gained again decomposes very easily into carbonic
acid and Beta Naphthol and melts at 157 degrees Celsius.
My foreign correspondent has now found that if in the above operation the
temperature is raised to 200 to 250° Celsius a second very constant Naphthol carbon
acid is produced being of a yellowish colour the melting point of which acid is
216° Celsius. This yellow Beta Naphthol carbon acid may also be obtained by
producing the alkaline salts of the acid Beta Naphthol Carbonic Ethers and by
heating these latter in a digester in an atmosphere of carbonio acid up to 200 to
250° Celsius.
COMPLETE SPECIFICATION.
A New or Improved Manufacture of Beta Naphthol Carbon Acid.
I, JAMES YATE JOHNSON of 47 Lincolns 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 the Chemical
Works Radebeul near Dresden Saxony, German Empire 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 a Beta naphthol carbon acid
of the melting point of 216 degrees Celsius by means of the reaction of Carbonic
acid upon the alkaline salts of the Beta-naphthol under pressure and at a tempera-
ture of 200 to 250 degrees Celsius.
The Beta-naphthol carbon acid (the production of which has been described in the
Specifications of Letters Patent No. 6134 of 1885 and No. 8155 of 1886) is produced
if carbonic acid is allowed to react on the alkaline salts of the Beta-naphthol under
pressure and at a temperature of 120 to 145 degrees Celsius. The very inconstant
or unstable acid thus obtained decomposes again very readily into Carbonic Acid and
Beta-naphthol and melts at 157 degrees Celsius.
My foreign correspondent has now found that if in the above operation the
temperature is raised to 200 degrees to 250 degrees Celsius a second very constant
or stable Naphthol carbon acid produced it being of a yellowish colour and
having a melting point of 216 degrees Celsius. This yellowish Beta-Naphthol

page_text: carbon acid may also be obtained by producing the alkaline salts of the said Beta-
naphthol carbonic ethers or esters and by beating these latter under pressure
in a digester in an atmosphere of Carbonic Acid up to from 200 to 250 degrees
Celsius.
Having now particularly described and ascertained the nature of the said
Invention and in what manner the same is to be performed I declare that what I
claim is :-
The manufacture of Beta-naphthol carbon acid by the reaction of carbonic acid
upon the alkaline salts of Beta-naphthol or the alkaline salts of Beta-naphthol
carbonic ethers or esters under pressure and at a temperature of from 200 degrees to!
250 degrees Celsius.
s on day of March 1030.
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, London, Agents.