Liquors, Juices, or Syrups.
Year: 1885

page_text: Liquors, Juices, or Syrups.
I, CHARLES DENTON ABEL, of No 28 Southampton Buildings, Chancery Lane in
the County of Middlesex, Consulting Engineer and Patent Agent, do hereby
declare the nature of my invention for "PROCESS FOR THE PURIFICATION AND
DECOLORATION OF SACCHARINE LIQUORS, JUICES OR SYRUPS
to be as follows:-
"
This invention relates to a process for the purification and decoloration of
saccharine liquors, juices or syrups by means of the oxides and salts of tin.
For purifying saccharine liquors or syrups, there is added thereto a salt of tin,
either in solution or in crystals, or in suspension in water, in proportions varying
according to the nature of the liquid to be purified and the degree of purification
and decoloration to be obtained. The liquid is then heated to boiling point for
several minutes, after which the acid of the salt is neutralised by any suitable
base. The oxide of tin is precipitated together with the coloring matters as also
is the new salt formed, if it be insoluble. The mass is then filtered, adding, if
necessary, any known coagulating body in order to facilitate the filtration. A
syrup is thus obtained which, compared with the primitive syrup, is much clearer
and more limpid. Its viscosity is diminished to a considerable degree and the
crystallisation of the sugar, after boiling, is considerably increased, inasmuch as
the organic salts of the syrup have been decomposed and their acids carried away
by the oxide of tin in its precipitation. The stannic combinations which have
given the best results in all respects, are the precipitated oxides of tin, the
protochloride of tin and the sulphate of tin. When the acid of the tin salt used
forms a soluble salt with bases, the application of which is rendered possible
by their small cost and their innocuous nature, such, for instance, as lime, the
inconvenience is experienced of leaving, in the saccharine liquor, a foreign salt.
But in many cases where only a minimum of such salt exists, the inconvenience is
not considerable; for example if, for the decoloration of molasses lime, or any other
innocuous alkaline body be used. In cases where it is indispensable that no new
salt should be left in the purified liquor, precipitated protoxide of tin may be
used with advantage this being insoluble in water. The operation then consists

page_text: of boiling, for a few minutes longer, the liquor to which the addition of protoxide
is made, and then filtering. Bin oxide of tin may also be employed. In any case,
the best results are obtained by precipitating the oxide of tin in the body of the
saccharine liquor itself. Among the salts of tin of comparatively low cost and of
which the acid can give an insoluble salt with the use of a comparatively innocuous
base, preference is given to the sulphate of protoxide of tin.
The operation is conducted as described above, the base employed being baryta ;
in this case, oxide of tin and sulphate of baryta are precipitated. When, instead
of precipitated oxides of tin, it is preferred to employ directly salts of tin according
to the method described above, the loss of a small quantity of sugar will in certain
cases occur. This defect may be obviated by alkalinising the liquor in advance,
and neutralising by the addition of salts of tin, as certain syrups darken in color
under the influence of free alkalis. It is preferred to operate in the following
manner: To the liquid to be treated, is added a carbonate in sufficient quantity to
neutralise the acid of the salt of tin to be used, the mass is heated to boiling
point and the solution of the salt of tin is then added, little by little, to the liquor;
after which, the mass is filtered. Thus, in employing the carbonate of baryta and
the sulphate of tin, purification is effected without leaving foreign salts in the
liquor treated and without producing waste.
ABEL & IMRAY,
Agents for the Applicant,
28, Southampton Buildings,
London, W.C.

page_text: Process for the Purification and Decoloration of Saocharine
Liquors, Juices, or Syrups.
I, CHARLES DENTON ABEL of N° 28 Southampton Buildings Chancery Lane in
the County of Middlesex, Consulting Engineer and 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 :-
This invention relates to a process for the purification and decoloration of
saccharine liquors, juices or syrups by means of the oxides and salts of tin.
For purifying saccharine liquors or syrups, there is added thereto a salt of tin,
either in solution or in crystals, or in suspension in water, in proportions varying
according to the nature of the liquid to be purified and the degree of purification
and decoloration to be obtained. The liquid is then heated to boiling point for
several minutes, after which the acid of the salt is neutralised by any suitable base.
The oxide of tin is precipitated together with the coloring matters as also is the
new salt formed, if it be insoluble. The mass is then filtered, adding, if necessary,
any known coagulating body in order to facilitate the filtration. A syrup is thus
obtained which, compared with the primitive syrup, is much clearer and more
limpid. Its viscosity is diminished to a considerable degree and the crystallization
of the sugar, after boiling, is considerably increased, inasmuch as the organic salts
of the syrup have been decomposed and their acids carried away by the oxide of
tin in its precipitation. The stannic combinations which have given the best,
results in all respects, are the precipitated oxides of tin, the protochloride of tin and
the sulphate of tin. When the acid of the tin salt used forms a soluble salt
with bases, the application of which is rendered possible by their small cost and
their innocuous nature, such, for instance, as lime, the inconvenience is experienced
of leaving, in the saccharine liquor, a foreign salt. But in many cases, where only
a minimum of such salt exists, the inconvenience is not considerable, for example,
if for the decoloration of molasses, lime or any other innocuous alkaline body be
used. In cases where it is indispensable that no new salt should be left in the
purified liquor, precipitated protoxide of tin may be used with advantage, this
being insoluble in water. The operation then consists of boiling, for a few minutes
longer, the liquor to which the addition of protoxide is made, and then filtering.
Bin-oxide of tin may also be employed. In any case, the best results are
obtained by precipitating the oxide of tin in the body of the saccharine liquor
itself. Among the salts of tin of comparatively low cost and of which the acid can
give an insoluble salt with the use of a comparatively innocuous base, preference
is given to the sulphate of protoxide of tin.
The operation is conducted as described above; the base employed being baryta
in this case, oxide of tin, and sulphate of baryta are precipitated. When, instead
of precipitated oxides of tin, it is preferred to employ directly salts of tin according
to the method described above, the loss of a small quantity of sugar will in certain
cases occur. This defect may be obviated by alkalinising the liquor in advance,
and neutralising by the addition of salts of tin, as certain syrups darken in color
under the influence of free akalies. It is preferred to operate in the following

page_text: manner: To the liquid to be treated, is added a carbonate in sufficient quantity to
neutralise the acid of the salt of tin to be used, the mass is heated to boiling point
and the solution of the salt of tin is then added little by little, to the liquor, after
which, the mass is filtered. Thus, in employing the carbonate of baryta and the
sulphate of tin, purification is effected without leaving foreign salts in the liquor
treated and without producing waste.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is
The process, substantially as herein described for the purification and decolor-
ation of saccharine liquors, juices or syrups by means of oxides or salts of tin
applied in any of the following ways:-
(a) introducing into the liquid the protoxide or binoxide of tin previously
prepared, boiling the mixture for some minutes and filtering.
(b) introducing into the liquid a salt of tin, such as the sulphate of the protoxide,
along with a base such as baryta, so that the tin oxide is separated within the
body of the liquid, boiling for some minutes and by filtration eliminating the tin
oxide and the insoluble salt of the base.
(c) introducing into the liquid a salt of tin, boiling for a few minutes, neutra-
lising the acid liberated from the salt by a base such as lime, and by filtration
eliminating the tin oxide and the salt of the base if it is insoluble.
(d) introducing first into the liquid a salt of alkali or alkaline earth such as
carbonate of baryta, heating to ebullition then adding solution of a salt of tin in
small succesive doses, and finally filtering.
ABEL & IMRAY,
Agents for the Applicant,
28, Southampton Buildings,
London, W.C.