AN IMPROVED METHOD OF RECOVERING TARTARIC ACID FROM THE MOTHER LIQUORS OBTAINED IN THE MANUFACTURE OF TARTARIC ACID
Year: 1879

page_text: LETTERS PATENT to Joseph Marzell, of Woburn Place, Russell Square, in the
County of Middlesex, Analytical Chemist, for the Invention of "AN IMPROVED
METHOD OF RECOVERING TARTARIC ACID FROM THE MOTHER LIQUORS
OBTAINED IN THE MANUFACTURE OF TARTARIC ACID." A communication from
abroad by 'Franz Dietrich, of Munich, Bavaria.
Sealed the 10th February 1880, and dated the 13th August 1879.
PROVISIONAL SPECIFICATION left by the said Joseph Marzell at the Office
of the Commissioners of Patents on the 13th August 1879.
JOSEPH MARZELL, of Woburn Place, Russell Square, in the County of Middlesex,
Analytical Chemist. "AN IMPROVED METHOD OF RECOVERING TARTARIC ACID
FROM THE MOTHER LIQUORS OBTAINED IN THE MANUFACTURE OF TARTARIC ACID."
[A communication from abroad by Franz Dietrich, of Munich, Bavaria.]
The object of this Invention is to recover or obtain tartaric acid from the so
called mother liquors obtained in the manufacture of tartaric acid.
For this purpose I proceed as follows:-
First. After diluting the mother liquors down to a certain degree of concen-
tration, I neutralize by means of a suitable salt a portion of the free sulphuric acid
contained in such liquors, in order to precipitate the said portion of sulphuric
acid and permit of its removal from the liquors; this is effected by precipitating
the resulting sulpbate by means of filtration, or otherwise.
Secondly. The liquor resulting from the above treatment is now mixed with a
solution of neutral tartrate of potassa. Tartar is thus formed and is precipitated,
and is removed from the liquor by filtration, or otherwise, and then washed.
Thirdly. The washed tartar is then treated with a suitable salt of lime, whereby
the tartar is decomposed into (1) tartrate of lime, and (2) neutral tartrate of
potassa.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Joseph Marzell in the Great Seal Patent Office on the 12th February
1880.
JOSEPH MARZELL, of Woburn Place, Russell Square, in the County of Middlesex,
Analytical Chemist. 'AN IMPROVED METHOD OF RECOVERING TARTARIC ACID
FROM THE MOTHER LIQUORS OBTAINED IN THE MANUFACTURE OF TARTARIC ACID."
(A communication from abroad by Franz Dietrich, of Munich, Bavaria.)
The object of this Invention is to recover or obtain tartaric acid from the so
called mother liquors obtained in the manufacture of tartaric acid.
For this purpose I proceed as follows:-
First. After diluting the mother liquors down to about 20° to 25° Beaumé,
I neutralize by means of a suitable salt (chalk preferred) about nine tenth's of the
free sulphuric acid contained in the liquors, in order to precipitate the said portion
of sulphuric acid and permit of its removal from the liquors, which is effected by
separating the resulting sulphate by means of filtration, or otherwise.
Secondly. The liquor resulting from the above treatment is now mixed with a
solution of neutral tartrate of potassa of about 15° to 20° Beaumé. Tartar is thus
formed and is precipitated, and is removed from the liquor by filtration, or other-
wise, and then washed.
Thirdly. The washed tartar is then treated with a suitable salt of lime, whereby
the tartar is decomposed into (1) tartrate of lime from which tartaric acid can be
obtained by the ordinary processes, and (2) neutral tartrate of potassa.
Having now described the nature of the said Invention and in what manner the
same is to be performed, I declare that I claim,―
The recovery of tartaric acid from the mother liquors by the method herein before
described, that is to say, by first neutralizing and removing the greater portion of
the free sulphuric acid; then obtaining tartar by mixing neutral tartrate of potassa
with the mother liquors, and lastly, treating the tartar so as to obtain tartrate of
lime from which tartaric acid can be obtained, all substantially as set forth.
In witness whereof, I, the said Joseph Marzell, have hereunto set my hand
and seal, this Eleventh day of February, One thousand eight hundred and
eighty.