Process for the Manufacture of Vanilline from Isoeugenol.
Year: 1894

page_text: Date of Application, 20th June, 1894
Complete Specification Left, 14th Feb., 1895-Accepted, 30th Mar., 1895
[Communicated from abroad by Messrs. HAARMANN & REIMER, Vanillin-Fabrik,
in Holzminden Weser, in the German Empire.]
Process for the Manufacture of Vanilline from Isoeugenol.
I, CHARLES DENTON ABEL of No. 28 Southampton Buildings, Chancery
Lane, in the County of London, Chartered Patent Agent, do hereby declare the
nature of this invention to be as follows:-
:-
My correspondents have observed that isocugenol is oxidised to vanilline by
heating it in a strong alkaline solution in the presence of peroxides, such as
peroxide of hydrogen, peroxide of sodium, peroxide of manganese, peroxide of
barium, peroxide of lead &c.
In using peroxide of sodium the new manufacture of vanilline from isocugenol
takes place in the following manuer:
Isoengenol is added to a solution of peroxide of sodium in water prepared in the
cold way and the mixture is cautiously heated until the isocugenol-sodium separated'
in the beginning has been dissolved and the reaction then taking place is
finished.
As already mentioned, in the process above described peroxide of sodium may
be replaced by peroxide of hydrogen, peroxide of barium, and the peroxides of
other metals. In these cases alkali-hydrate or a concentrated solution thereof of
course requires to be added.
From the alkaline solution the vanilline is disengaged by means of acids and
purified in the known way.
As has been stated in the Specification to De Laire's Patent No. 17547 of 1890,
eugenol is converted into isoengenol by heating it sufliciently in the presence of
alkali hydrate. By utilising the process described in the Specification to the
above mentioned Patent, isoeugenol may be replaced in the above described process
by eugenol, which in this case, for converting it into isocugenol, is first heated
separately, prior to the addition of a peroxide, in the presence of a strong alkaline.
lye, whereupon the process is carried out in the above described manner.
Dated this 20th day of June 1894.
ABEL & IMRAY,
Agents for the Applicant.
Process for the Manufacture of Vanilline from Isoeugenol.
I, CHARLES DENTON ABEL, of No. 28 Southampton Buildings, Chancery
Lane, in the County of London, Chartered Patent Agent, do hereby declare the
nature of this invention and in what manner the same is to be performed to be
particularly described and ascertained in and by the following statement :-
My correspondents have observed that isoeugenol is oxidised to vanilline by
heating it in a strong alkaline solution in the presence of peroxides, such as
peroxide of hydrogen, peroxide of sodium, peroxide of manganese, peroxide of
barium, peroxide of lead & c.

page_text: In using peroxide of sodium the new manufacture of vanilline from isoengenol
takes place in the following manner:
Isoengenol is added to a solution of peroxide of sodium in water prepared in the
cold way and the mixture is cautiously heated until the isoengenol sodium separated
in the beginning has been dissolved and the reaction taking place is finished.
As already mentioned, in the process above described peroxide of sodium may
be replaced by peroxide of hydrogen, peroxide of barium, and the peroxides of
other metals. In these cases alkali-hydrate or a concentrated solution thereof of
course requires to be added.
From the alkaline solution the vanilline is disengaged by means of acids and
purified in the known way,
As has been stated in the Specification to De Laire's l'atent No. 17547 of 1890,
eugenol is converted into isoeugenol by heating it sufficiently in the presence of
alkali hydrate. By utilising the process described in the Specification to the
above mentioned Patent the above described process may start with eugenol in
place of isocugenol, the eugenol being in this case converted into isoengenol by first
henting it separately in the presence of a strong alkaline lye, whereupon the
process is carried out in the above described manner.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is: :-
The manufacture of vanilline from isveugenol by heating the latter in a strong
alkaline solution in the presence of peroxides, whereby the isocugenol is converted
by oxidation into vanilline, substantially as described.
ABEL & IMRAY,
Agents for the Applicant.
ABEL & IMRAY,
Agents for the Applicant.