'The NEW Savillex DST-4000 Acid
Purification System is the ultimate high capacity unit for routine laboratory
production of ultra-pure acids or water and comes complete with everything
required to distill ultra-pure acid.
The DST-4000 consists of a
self-contained PFA reservoir/condenser vessel with all wetted parts made of
PFA. The lower reservoir is surrounded by an electric heating mantle. Up to
4000ml of trace metal grade acid is added to the vessel via the front fill tube
which fills the reservoir from the bottom. The acid level in the reservoir is
conveniently displayed by the liquid level gauge on the fill tube. Power
is supplied to the heating mantle by the temperature
controller. Distillation temperature is user set via the controller and a
digital display on the controller shows the temperature setting.
The acid in the reservoir is gently
heated, and high purity acid vapour is generated. The acid vapour
condenses on the walls of the upper part of the vessel (condenser) and is
collected in a channel which drains into two 2,000ml Purillex ™ PFA collection
bottles. The vent assembly and the vents in the bottle transfer closures allow
displaced air out of the system during the distillation process to prevent pressurisation.
All vents are fitted with PTFE membranes, which prevent airborne contamination
from entering the system. The formed vent tube maintains even pressure
throughout the system as it is filled and drained.
The production rate of high purity
acid is dependent on the temperature setting used on the controller: A
temperature setting of 90˚C (194˚F) will produce acid at approximately 85ml/hr.
The temperature setting only affects the production rate and not the purity or
quality of the acid. The maximum acid temperature setting that can be
programmed into the controller is 90˚C (194˚F) which is well below the boiling
point of the acid so no contaminants are carried over to the distillate.
Distillation temperature is precisely maintained by PID control. The low
maximum temperature setting and integrated thermal fuse in the heating element
also provides a high degree of safety during the distillation process.
In addition, the DST-4000 is equipped
with a liquid level sensor that will automatically shut off power to the heater
when the liquid level in the reservoir drops below 500ml. The automatic
shut-off feature is useful when operating the DST-4000 unattended or for an
extended period of time, since automatic shut-off ensures the acid is not
distilled to dryness. Any residual acid remaining after distillation (typically
less than 500ml) is drained to waste. The distillation process can be stopped
at any time if high purity acid is needed urgently.
The Savillex DST-4000 is extremely
simple to install and requires no cooling water supply. With a footprint of
only 30 cm x 50 cm, and a height of only 55 cm, the DST-4000 will fit into most
fume hoods. The controller is connected via a 3 meter cord and is designed to
be placed outside the fume hood.
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