Page 59 - FoodFocusThailand No.218 MAY 2024

SMART PRODUCTION

Step 2: Carbonatation All (2) dirt repellant annular PTFE junction in contact with the measuring media;
traces of lime must be eliminated pressure-compensated reference system to enable operation at particularly high
before the concentration step to pressures, 13 bar (188 psi) and tolerance of high temperatures, 130 °C (266 °F).
prevent scale buildup in process The sensor has been developed and manufactured according to the latest
pipes and vessels. Carbon dioxide standards, e.g., PED (Pressure Equipment Directive 97 / 23 / EC, Art. 3, Sec. 3).
is added to the juice to precipitate For process media in the sugar industry containing particles and aggressive
the lime as less soluble calcium chemicals, the optional flat glass membrane sensor with integrated solution ground
carbonate, which also captures is the optimal choice, especially if high operational temperatures are present.
other impurities during precipitation.
CO is usually added in several
2
stages to avoid an unmanageable More Information Service Info C007
type of precipitate that can develop
in a single-stage carbonation. At
each stage of carbonatation, the
pH is measured, and an appropriate
volume of CO is injected. By the
2
final stage, the pH should be
reduced to approximately 9. After
carbonatation, the juice is filtered
to eradicate all traces of solid
particles before flowing into the
sulfitation tower.
Step 3: Sulfitation Sulfur
dioxide is added to the juice to
lower the pH to 5 – 6 before it
proceeds to the evaporators for
in Cane Sugar bleaches the juice to improve
concentration. The SO also
2
flavor, texture, and color. Without
this step, an alkaline juice would
Refineries be produced, and the sugar crystals
would stick together due to moisture
absorption, developing an
undesirable taste.

New o p ti o n fo r p H
measurement systems
A leading global manufacturer of
measurement instruments offers a
variety of solutions for pH
measurement specifically tailored
to the needs of the cane sugar
industry. This pH sensor was
designed for harsh environments.
It is a gel-type sensor as the top-
of-the-line. When the pH sensor
combines with a retractable
housing from the group product
family, it offers excellent reliability .
1
This pH sensor has a long
operating life and significantly
reduces sensor maintenance and
replacement costs. This is due to
the following technical features:
(1) extremely long diffusion path in
two separated electrolyte chambers

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