Improvements in the Purification of Saccharine Juices or Sugar Solutions.
Year: 1898

page_text: Date of Application, 26th July, 1898-Accepted, 17th Sept., 1898
Improvements in the Purification of Saccharine Juices or Sugar
Solutions.
We, ERNST WILHELM GERBRACHT, of 107, Rodney Street, City of New York,
United States of America, Refiner, and FERDINAND GERHARD WIECHMANN, of
771, West End Avenue, City of New York, United States of America, Chemist, 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 :-
Our invention relates to a process for purifying saccharine juices or sugar
solutions from whatever source derived. In our prior application No. 29,630 dated
December 14th 1897, we have described a process for treating black-strap, which,
however, was also applicable to the treatment of sugar solutions generally, and which
consisted in introducing into the solution to be treated, sufficient of a suitable
alkali to give the sugar solution an alkaline reaction, then boiling in vacuo to expel
the volatile alkaline products, then adding sufficient of a suitable acid to neutralize
the alkali previously added and leave a free acid, and finally again boiling in vacuo
to expel the volatile acid products.'
Our present invention differs from that described above only in that, instead of
using first an alkali and then an acid in connection with a vacuum apparatus, low
temperature and low pressure, we make use of a chemical substance, such as salt, for
instance as calcium tetra hydrogen ortho-phosphate, also known as mono-calcium
hydrogen phosphate, CaH (PO4)2 or ammonium hydrogen ortho-phosphate,
(NH4)2HPO4, or ammonium di-hydrogen ortho-phosphate NH,H,PO, or other suitable
salt such that when it is introduced into the saccharine solutions, and the solution
boiled in vacuo under low temperature, it is decomposed into an alkaline salt and an
acid and expels the volatile alkaline products, as well as the volatile acid products
contained in the solution acted upon.
Before describing the manner in which the process is carried out, we wish to state
that this process, like the process formerly described, is applicable to the treatment
of all products of the sugar beet, including the juice from the sugar beet, the raw
sugar made therefrom, and all the various syrups and solutions, such
as wash-syrups, end-syrups, black-strap, etc., obtained in the various processes
of manufacturing and refining beet sugar.
We will describe our present invention in connection with the treatment of raw
beet syrups, and we proceed as follows:-
To a quantity of defecated and, if preferred, concentrated beet-juice we add mono-
calcium hydrogen phosphate, or ammonium hydrogenortho-phosphate, or other suit-
able salt of the character indicated, to an amount equivalent to 0.5 % to 1.5 % by
weight of the dry substance contained in the beet-juice. We boil the mixture in
vacuo, at a low temperature for about two hours; the vacuum being maintained as
high as possible, and the temperature as low as possible.
The result of this treatment is to effect the removal of a distillate containing
a large proportion of the offensive matters originally present in the beet-
nice

page_text: The solution remaining after this treatment is then subjected to the well known
processes of filtration through suitable filter bags or filter presses, and, if so desired,
bone-black, and is then boiled down in a vacuum pan to a magma which is separated
by a centrifugal machine into a sugar and a syrup, both of agreeable flavour and free
from all objectionable taste and smell, both fit for direct use.
The treatment of sugar solutions and black-strap is substantially the same as that
above described..
Having now particularly described and ascertained the nature of this
invention and in what manner the same is to be performed, we declare that what we
claim is
The herein described process of treating saccharine juices and sugar solutions, by
adding to them a chemical substance such as those indicated, which, when the
solution is boiled in vacuo at low temperature is decomposed setting free an alkaline
salt and an acid, and causing the volatile alkaline and the acid products of the
solution to be distilled off.