IMPROVEMENTS IN THE MANUFACTURE OF ALPHA AND BETA NAPHTOL PROVISIONAL SPFICATION
Year: 1883

page_text: LETTERS PATENT to Ivan Levinstein of the City of Manchester in the
County of Lancaster, Chemist for an Invention of "IMPROVEMENTS IN THE
MANUFACTURE OF ALPHA AND BETA NAPHTOL
PROVISIONAL SPECIFICATION left by the said Ivan Levinstein at the
Office of the Commissioners of Patents on the 7th May 1883.
IVAN LEVINSTEIN, of the City of Manchester, in the County of Lancaster,
Chemist, "IMPROVEMENTS IN THE MANUFACTURE OF ALPHA AND BETA NAPHTOL,"
My invention relates to and consists in improvements in the manufacture of
Alpha and beta Naphtol.
In the process of the manufacture hitherto generally employed the sulpho acids
of Naphtalene are converted into their sodium salts by means of caustic or carbonate
of soda,-these sodium salts are then fused with caustic soda, and this smelt, as it
is termed, is then dissolved in water and the Naphtol precipitated by means of
muriatic or sulphuric acid.
In carrying out my invention I fuse the sodium salts of the sulpho acids of
Naphtalene with caustic soda in the usual manner, and when the whole is fused I
allow the mass to settle a few minutes, taking care to keep the whole liquid-when
two substances will separate from each other-of which the one floating on the top,
consists principally of Naphtolate of soda, while the other is principally composed
of sulphite of soda, some caustic soda, and of some impurities of the caustic. The
Naphtolate of soda I treat in the usual way, viz, by dissolving it in water and pre-
cipitating the Naphtol by means of acid from this solution. The bottom layer,
which I will call the crude sulphite, I dissolve in water, and I use the solution of
the same, for converting the sulpho acids of Naphtalene into their sodium salts.
The advantages of my invention are:
(1). The saving of soda in converting the sulpho acid of Naphtalene into their
sodium salta

page_text: (2) The saving of acid necessary to precipitate the Naphtol from the so called
Naphtol smelt.
Instead of converting the sulpho acid of Naphtalene into their sodium salts,
Potash or a mixture of soda and Potash may be used, and instead of fusing these
sulpho Naphtalene salts with caustic soda-caustic Potash, or a mixture of caustic
Potash and soda may be used-my process is however equally applicable to either
of them the difference would only be that the crude sulphite would consist of
mixtures of sulphite of Potash and sulphite of soda, and caustic soda, and Potash,
or of sulphite of Potash, and Potash etc-but so far as the object of my invention
is concerned this is quite immaterial.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Ivan Levinstein in the Great Seal Patent Office on the
23rd October 1883.
IVAN LEVINSTEIN of the City of Manchester, in the County of Lancaster, Chemist
"IMPROVEMENTS IN THE MANUFACTURE OF ALPHA AND BETA NAPHTOL
My invention relates to and consists in improvements in the manufacture of
alpha and beta Naphtol.
In the process of the manufacture hitherto generally employed the sulpho acids
of Naphtalene are converted into their Sodium salts by means of caustic or carbonate
of soda, these sodium salts are then fused with caustic soda, and this smelt, as it is
termed, is then dissolved in water and the Naphtol precipitated by means of muriatic
sulphuric acid or other acids.
In carrying out my invention I fuse the sodium salts of the sulpho acids of
Naphtalene with caustic soda in the usual manner, and when the whole is fused, I
allow the mass to settle a few minutes, taking care to keep the whole liquid; when
two substances will separate from each other, of which the one floating on the top
consists principally of Naphtolate of Soda while the other is principally composed
of sulphite of soda some caustic soda, and of some other impurities.
The Naphtolate of soda, I treat in the usual way, viz, by dissolving it in water
and precipitating the Naphtol by means of acid from this solution. The bottom
layer, which I will call the crude sulphite, I dissolve in water, and I use the
solution of the same for converting the sulpho acids of Naphtalene into their
sodium salts.
The advantages of my invention are,
(1) The saving of Alkali (either Soda or Potash) in converting Naphtalene into
Naphtol.
(2) The saving of acid necessary to precipitate the Naphtol from the so called
Naphtol smelt.
Instead of converting the sulpho acid of Naphtalene into their sodium salts;
Potash or a mixture of soda and Potash may be used, and instead of fusing these
sulpho Naphtalene salts with caustic soda; caustic Potash, or a mixture of caustic
Potash and Soda may be used; my process is however equally applicable to either
of them-the difference would only be that the crude Sulphite would consist of
mixtures of sulphite of Potash and Sulphite of Soda, and Caustic Soda and Potash,
or of Sulphite of Potash and Potash etc,-but so far as the object of my invention
is concerned this is quite immaterial.
I have now particularly described the nature of my said invention and the
modes of carrying the same into effect and claim as my invention, the improved
mode or modes of manufacturing alpha and beta Naphtol, substantially as
herein before described.
In Witness whereof I the said Ivan Levinstein have hereunto set my hand
and seal this twenty second day of October in the year of our Lord one thousand
eight hundred and eighty three.