A NEW PROCESS OF SEPARATING ORTHO TOLUIDINE FROM PARATOLUIDINE, ORTHO TOLUIDINE FROM ANILINE 11 A ARARAMD
Year: 1883

page_text: LETTERS PATENT to Dr. Julius Weilor, Bole Proprietor of the firm of
J, W. Weiler & Co, Manufacturing chemist at Ehrenfeld near Cologne in the
Empire of Germany for an Invention of A NEW PROCESS OF SEPARATING
ORTHO TOLUIDINE FROM PARATOLUIDINE, ORTHO TOLUIDINE FROM ANILINE
11
A
ARARAMD
COMPLETE SPECIFICATION filed by the said Julius Weiler at the Office
of the Commissioners of Patents on the 22nd June 1883.
DR JULIUS WEILER, sole proprietor of the firm of J. W, Weiler & Cº, Manu-
facturing Chemist, at Ehrenfeld near Cologne in the Empire of Germany ▲ NEW
PROCESS OF SEPARATING ORTHO-TOLUIDINE FROM PARATOLUIDINE, ORTHO-TOLUIDINE
FROM ANILINE AND PARATOLUIDINE BY MEANS OF PHOSPHATES AND ARSENATES
By neutralizing Aniline, Paratoluidine or Ortho-Toluidine by means of phosphoric
or arsenic acid, phosphates or arsenates of nearly the same solubility are obtained.
These three bases show a great difference among them if I prepare their
phosphates or arsenates by mixing their salts with phosphates or arsenates. For
this purpose I take by preference ordinary phosphate of soda (phosphoric Natron)
Na, HPO + 12 H, O.
By treating hydrochlorate of Aniline with a solution of phosphate of soda I get
chloride of sodium and phosphate of aniline.
2 C, H, N H.. H Cl + Na, H PO, = 2 Na Cl + [(C, H₂ N H₂), H P O]
The hydrochlorate of Paratoluidine is subjected to the same reaction. The
phosphate of Aniline or Paratoluidine thereby obtained is not soluble in hot
water.
The hydrochlorate of Orthotoluidine is quite the otherwise if it is treated with
phosphate of soda. There is obtained Chloride of Sodium, phosphate of soda and
free Ortho-Toluidine.
C₂ H, N H¸ H Cl + N A, HP O₁ = Na Cl + Na H₂ P O、 + C, H, N H„
[Price 2d.]

page_text: However I only obtain 80% free Ortho-Toluidine by this operation. The
remainder of the hydrochlorate of Ortho-Toluidine acts upon the Phosphate of
Soda, which has been formed and gives Chloride of Sodium and phosphate of
Ortho-Toluidine.
C, H, NH, HCl + Na, HPO, = Na Cl + [C, H, N H, H₂ PO,]; this product
is extraordinarily soluble in cold water.
The Arsenate of soda acts in the same manner like phosphate of Soda. For
separating Ortho-Toluidine from Paratoluidine and Aniline I proceed as follows-
I neutralize the mixture of the bases to be separated by muriatic acid and allow
a solution of Phosphate of Soda to run therein.
I then get a cake of crystals quite penetrated by oil. By heating it, the Ortho-
Toluidine rises up to the surface in an oil-couch or film which can be removed.
The water contains in solution great quantities of Phosphate of Aniline and
Paratoluidine and also a little Phosphate of Ortho-Toluidine. In cooling, the
phosphates of Aniline and Toluidine entirely crystallize.
I separate the bases-of the-phosphates by means of bases. By making use of
Soda I regain, at the same time, the Phosphate of Soda I had employed, which I
can then use again for separating other quantities.
Having now described the nature of the said Invention and in what manner the
same may be performed, 1 declare that I claim,
The herein described Process of separating Para-Toluidine from Ortho-Toluidine
and also Aniline and Paratoluidine from Ortho-Toluidine by treating the bases
with phosphates or arsenates.
In witness whereof I the said Julius Weiler have hereunto set my-hand and
seal this Eighteenth day of June in the year 1883.
TR TOT TTTC
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