A NEW OR IMPROVED PROCESS FOR THE MANUFACTURE OF NAPHTHOL CARBONIC ALKALINE SALTS
Year: 1885

page_text: [Communicated from abroad by Dr. Carl Kolbe, Chemist, and Carl Reutsch,
Merchant, both of Rudebeul, near Dresden, Saxony, in the Empire of
Germany, trading under the style or firm of Dr. F. Von Heyden,
Nachfolger.]
I JOHN HENRY JOHNSON of 47 Lincoln's Inn Fields in the County of
Middlesex Gentleman do hereby declare the nature of the said Invention for
"A NEW OR IMPROVED PROCESS FOR THE MANUFACTURE OF NAPHTHOL CARBONIC
ALKALINE SALTS" which Invention has been communicated to me from abroad by
Dr Carl Kolbe, Chemist, and Carl Reutsch, Merchant, both of Radebeul near
Dresden, Saxony, in the Empire of Germany, trading under the style or firm
of Dr F. Von Heyden, Nachfolger 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 naphthol carbonic (Cr, H. (OH)
(CO OH)
alkaline salts by the action of dry carbonic acid employed as hereinafter
explained and also to their subsequent treatment for the production of alpha or
beta carbonaphthol acid alkaline salts.
My foreign correspondent has ascertained that carbonapthol acids (oxynaphthoic
acids) may be obtained by means of processes similar to those described in the
Specification of Letters Patent N° 10167 dated the 15th day of July 1884 for the
production of salicylic acid. This result is obtained by proceeding according to
the methods next hereinafter described.
1. When the dry alkaline salts of alpha or beta naphthol are treated with dry
carbonic acid at ordinary temperature there are formed so long as absorption takes
place alkaline salts of the acid carbonic alpha or beta naphtholethers. The
following equation may be given as an illustration of the formation of the sodium
salts.
Axt
AA
TT
A1

page_text: converted into the simple alkaline salt of the alpha and beta carbo naphthol acid.
The equation shewing the conversion or transposition of sodium naphthol carbonate
into the corresponding sodium salt of carbonaphthol acid takes place may be taken
as an example of this process.
он
C₁, H, O, CO, ONa = C₁, Hε {00,ON}
There is no excess of pressure on opening the vessel the absolutely dry
pulverulent salts are dissolved in water the free acid is precipitated by means of a
mineral acid and purified by crystallisation in the usual manner.
2. The alkaline salts of the alpha and beta naphthol are quickly dried and placed
in an autoclave or vessel with a tight fitting cover into which dry carbonic acid is
then pumped as long as may be necessary for the formation of the alkalinaphthol-
carbonate. The vessel (that is to say, the inlet pipe admitting the carbonic acid
into the vessel) is then closed as long as the carbonic acid is not entirely absorbed
and no excess of pressure is present. The mass is then allowed to remain in the
vessel being frequently stirred for a few hours in order to admit of the complete
conversion of the naphthol salt into naphthol-carbonic salt after which the vessel
is heated to form about 120 to 140 Centigrade in order to effect the conversion
into simple alpha or beta carbonaphthol acid salt.
3. Dry alkalinaphthol salts are placed in an autoclave and sufficient solid
carbonic acid is thrown in to produce the formation of the naphtholcarbonic alkaline
salt. The apparatus is then quickly closed and the operation proceeded with as
herein before described under the second method.
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
A new or improved process for the manufacture of naphtholcarbonic alkaline
salts by the action of dry carbonic acid at atmospheric temperature either without
pressure or under pressure in conjunction with a cooling process upon naphthol-
alkaline salts and converting the dry naphtholcarbonic alkaline salts thus obtained
into alpha or beta carbonaphthol acid alkaline salts by heating in airtight
apparatus to from about 120 to 140 degrees Centigrade substantially as hereinbefore
described.