The Honolulu republican. [volume] (Honolulu, T.H.) 1900-1902, 1900-09-04
FeUlEs lulITE n
SupEllElT ellnfklnon.
Result Of q Comparative Test Of
Two Processes on . Japan
zee Plantation.

&c 1106t8S10H>
The Kemanglen estate in the resi-
iency Of legal Java adopted Deming-s
superheat eIariheation last year. while
still retaining their old defecation plant
for one crop. thus enabling one TO make
comparative analysis of the same cane
juice clarified by both methods
The superheat Qualification worked
very satisfactorily during the whole
grinding season, the old plant being
only used for the comparative analysis.
referred TO above The tubes remained
clean and did not scale. and only now
and then the apparatus required tho--
ough cleaning with dilute hydrochloric
acid, in consequence OF the outside CT
the tubes in the first absorber becoming
dirty with mud from the cane juice.
In the first few days Of the grinding
season the clarified juice was not clear.
but il soon appeared that this was only
the case with very good juice, which.
owing to its high density, did not allow
| the rapid subsistence Of the small guam
| rity OF light scum The addition of
some acid phosphate of lime. previous
Ito the lining, made it more fiocculent
and promoted its subsiding This agent.
however, was no longer required when
the juices were more impure and the
amount OF scum larger, in which case
the settling went on without further
difficulty.
From a chemical point of view it
was important to know:
!. Whether the exposure Of the juice
to the elevated temperature did not re-
suit in the breaking up of sucrose
2. Whether the long stay in the
large settling tanks did not cause sour
ness or deterioration.
g. Whether really the experimenting
precipitates more gummy and other
substances from the juice than the or
binary DELEGATION.
The first two questions were easily
answered by the figures in the labora-
tory journal, which showed that the
| during the whole season and had a
more elevated quotient of purity than
1 tho or;o;poI mill i,,ioa
In order to prove this by direct ex-
| pertinent, the juice from canes out of
one and the same field were clarified
| alternately, one day by the old defeca-
ton process and on another by Dem
ing's superheat defecation.
In order to ascertain whether more
/ impurities had been eliminated by the
Deming process than by ordinary modes
| OF DELEGATION, portion OF every masse-
cutie was put separately in large fun
nels, the necks of which were shut off
by plug of glass-wool. The molasses
drained off from the masse-cuite
through this filtering material were an
.alysed, as the impurities of the Juice
are accumulated therein, and therefore
the chance Of detecting a difference is
much better when examining these I'M
diluted molasses than when the juice
or the syrup analysed
I determined the ash, soluble lime
salts, gum and silica, with the follow
ing results:
Molasses Cheribon cane, defecation-
Ash. Lime. Gum. Silica.
4.e7 o.2O7 0.sos 1.2s
Molasses Cheribon cane, Deming's-
Ash. Lime Gum. Silica.
4.59 0.245 0.720 LOG
Molasses Memtok cane, defecation-
Ash. Lime Gum. Silica.
4.5o O370 O.e36 1.32
Molasses Memtok cane, Deming's-
Ash. Lime. Gum. Silica.
ass 0.331 o.604 1.24
From these experiments 1t results
that during superheating and during
the long stay in the large settling tanks
no sucrose is broken up. and no sour
| ness arises, so that from a chemical
point Of view Deming's superheat clari-
| fication stands in no respects behind
the usual DELEGATION process. whilst its
mechanical advantages are many.
1t should be mentioned here that
the last crop was not properly adapted
for showing the precipitation Of gums
by Deming's process, since the juices
generally were so pure and easy to
work up that even factories which
used to work juices that required car
donation in order to obtain a proper
Qualification could use the common de-
location process without difficulty.
In some factories it occurs that juices
clarified in the usual way become COW
cred with thin skin on evaporation in
an open dish. In this case we are sure
that the vessels Of the triple-effect
ESPECIALLY the frsD viii become very
rapidly fouled with black, muddy sub
stance, while owing to the bad trans
mission Of heat, evaporation goes OF
slowly, and the syrup remaining at the
elevated temperature for long time
acquires a very dark color.
On calculating little Of this syrup
with few drops Of hydrochioric acid,
and mixing 1t with i've times its vol
ume Of alcohol. an abundant precipita-
ton OF gums will clearly show the real
cause Of the deposition. OF muddy sub
stances.
The occurrence OF large quantities
Of these troublesome constituents may
be due to the nature Of the soil or to
the variety Of the cane.
noted the case Of q factory crushing
Memtok cane during the first half of
hr ~-Af~k 49, 4