Improved Process for Obtaining the Entire Quantity of Crystallisable Sugar contained in Sugar Mass.
Year: 1889

page_text: Date of Application, 20th Dec., 1889-Accepted, 8th Feb., 1890
CUMI LELE DT POLITICA
Improved Process for Obtaining the Entire Quantity of Crystallisable
Sugar contained in Sugar Mass.
I CARL STEFFEN, of No. 40 Heugasse, in the City of Vienna, Austria, Gentleman,
do hereby declare the nature of my said Invention and in what manner the same
is to be performed, to be particularly described and ascertained in and by the
following statement :-
My invention relates to a process for obtaining the entire quantity of crystallisable
sugar contained in sugar mass, the novel and main feature of the same being, that
the purest product, the warm beetroot sugar mass produced in the factory and taken
fresh from the vacuum apparatus, is intiinately mixed with the worst product, that
is, with molasses or the factory syrup which is not worth subjecting to the
crystallising process, in appropriate quantity and in suitable large stirring vessels,
so that molasses and sugar mass form a more or less homogeneous thin crystalline
pulp, which is gradually cooled by means of air in natural manner or submitted to
artificial cooling.
The methods hitherto known and applied for setting free sugar masses from thin
syrup in order to obtain crystalline or raw sugar are limited to the separation of the
syrup adhering to the sugar mass from the crystals, and no device or technically
available process, by means of which an absolute crystallising of the crystallisable
mother liquor adhering to the sugar mass, other than simply cooling the entire sugar
mass in natural or artificial manner, is practicable without destroying sugar.
These
customary methods are so far disadvantageous, as the mother liquor of the sugar
mass cannot so crystallise as to cause the crystallisable sugar in the same to
crystallise onto the sugar crystals and thereby enlarge the same, but the mother
liquor either fails to crystallise at all, or in such fine form that a separation of the fine
crystalline particles in mechanical manner is rendered impossible, as the same, by the
separating process, pass into the mother lye or even prove a hindrance to this process
of separation.
Now according to my invention, and in contradistinction to the customary methods,
the purest product of the factory, the hot sugar mass from the vacuum apparatus, is
intimately mixed in suitable stirring devices with molasses, so that the sugar mass
and the molasses form a more or less homogeneous thin crystalline pulp, which is
gradually cooled in the stirring device by means of natural air cooling or more
rapidly by artificial cooling, when the stirring device is provided with double
walls, the space being filled with water or cooled by means of cold air.
The molasses to be mixed with the sugar mass is, for the crystallisation, an indifferent
body, which is not able to dissolve the sugar, to separate its crystals out or to prevent
the crystallisation of the crystallisable mother liquor, but gives the latter, when
mixed, a greater volume, so that the crystals of the sugar mass and the indifferent
bodies (the molasses and the crystals of the mother liquor) form a more or less
homogeneous liquid pulp. I bereby attain the combination of the crystallisable
sugar molecules in the mother liquor, through the gradual cooling of the fluid when
the same is kept in motion by the stirring device, with the crystals in the mass.
The entire crystallisable sugar contained in the mother liquor is, in this manner,
wou, simultaneously with the sugar crystals formed in the mass in the vacuum
apparatus, as marketable raw or crystalline sugar, when the mother liquor, now
freed from its crystals and the indifferent body added to the mass, are subsequently
separated out or drawn off. By mixing the corresponding quantity of molasses with
the sugar mass and treating this mixture in appropriate lixiviating devices
(lixiviating batteries) according to well known methods, the entire crystallisable
sugar in the mass is obtained as marketable sugar and the mother liquor, in one

page_text: Date of Application, 20th Dec., 1889-Accepted, 8th Feb., 1890
Improved Process for Obtaining the Entire Quantity of Crystallisable
Sugar contained in Sugar Mass.
I CARL STEFFEN, of No. 40 Heugasse, in the City of Vienna, Austria, Gentleman,
do hereby declare the nature of my said Invention and in what manner the same
is to be performed, to be particularly described and ascertained in and by the
following statement :-
the
My invention relates to a process for obtaining the entire quantity of crystallisable
sugar contained in sugar mass, the novel and main feature of the same being, that
the purest product, the warm beetroot sugar mass produced in the factory and taken
fresh from the vacuum apparatus, is intimately mixed with the worst product, that
is, with molasses or the factory syrup which is not worth subjecting to
crystallising process, in appropriate quantity and in suitable large stirring vessels,
so that molasses and sugar mass form a more or less homogeneous thin crystalline
pulp, which is gradually cooled by means of air in natural manner or submitted to
artificial cooling.
The methods hitherto known and applied for setting free sugar masses from thin
syrup in order to obtain crystalline or raw sugar are limited to the separation of the
syrup adhering to the sugar mass from the crystals, and no device or technically
available process, by means of which an absolute crystallising of the crystallisable
mother liquor adhering to the sugar mass, other than simply cooling the entire sugar
mass in natural or artificial manner, is practicable without destroying sugar. These
customary methods are so far disadvantageous, as the mother liquor of the sugar
mass cannot so crystallise as to cause the crystallisable sugar in the same
crystallise onto the sugar crystals and thereby enlarge the same, but the mother
liquor either fails to crystallise at all, or in such fine form that a separation of the fine
crystalline particles in mechanical manner is rendered impossible, as the same, by the
separating process, pass into the mother lye or even prove a hindrance to this process
of separation.
to
Now according to my invention, and in contradistinction to the customary methods,
the purest product of the factory, the hot sugar mass from the vacuum apparatus, is
intimately mixed in suitable stirring devices with molasses, so that the sugar mass
and the molasses form a more or less homogeneous thin crystalline pulp, which is
gradually cooled in the stirring device by means of natural air cooling or more
rapidly by artificial cooling, when the stirring device is provided with double
walls, the space being filled with water or cooled by means of cold air.
The molasses to be mixed with the sugar mass is, for the crystallisation, an indifferent
body, which is not able to dissolve the sugar, to separate its crystals out or to prevent
the crystallisation of the crystallisable mother liquor, but gives the latter, when
mixed, a greater volume, so that the crystals of the sugar mass and the indifferent
bodies (the molasses and the crystals of the mother liquor) form a more or less
homogeneous liquid pulp. I hereby attain the combination of the crystallisable
sugar molecules in the mother liquor, through the gradual cooling of the fluid when
the same is kept in motion by the stirring dovice, with the crystals in the mass.
The entire crystallisable sugar contained in the mother liquor is, in this manner,
won, simultaneously with the sugar crystals formed in the mass in the vacuum
apparatus, as marketable raw or crystalline sugar, when the mother liquor, now
freed from its crystals and the indifferent body added to the mass, are subsequently
separated out or drawn off. By mixing the corresponding quantity of molasses with
the sugar mass and treating this mixture in appropriate lixiviating devices
(lixiviating batteries) according to well known methods, the entire crystallisable
sugar in the mass is obtained as marketable sugar and the mother liquor, in one

page_text: operation, as molasses of like low value or of like impurity with the molasses employed,
so that a further boiling of this syrup for crystallising purposes need not be
resorted to.
The quantity of syrup to be added to the sugar mass depends on the amount of
water (most probable, not more than 6%) contained in the sugar_mass, and is in
practice not less than 20% or more than 100% of the sugar mass. I prefer to use
molasses of a concentration not less than 42° Beaumé, the temperature of the same
being the ordinary factory temperature and the cooling of the mixture of sugar mass
and molasses in the stirring device should not be carried below this temperature, that
is, the usual factory temperature.
The duration of the stirring process of the sugar mass and the molasses in the
stirring device should not be less than 12 hours, and if the work is to be thoroughly
carried out a duration of 20 to 24 hours is recommended.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is:
1. A process for obtaining all the crystallisable sugar contained in the mother
liquor from boiled sugar mass, and causing such sugar to be deposited on the sugar
crystals of the mass, consisting in mixing the warm sugar mass let off from the
vacuum apparatus with molasses or syrup not worth subjecting to the crystallising
process, and allowing this mixture to gradually cool, in order that the crystals of the
sugar mass with the crystals subsequently separated out from the mother liquor in
lixiviating batteries may be won, whilst the mother liquor, which has been deprived
of its crystallisable sugar, passes off with the molasses added to the mass, substantially
as set forth.
2. The reemployment of the molasses produced and separated out according to the
aforedescribed and aforeclaimed process for mixing with sugar mass in order to obtain
the crystallisable sugar contained in the mother liquor of the same, substantially
as and for the purpose set forth.
Dated this 20th day of December 1889.
CARL STEFFEN.
By his Agents,
Horn & Son.