Vacuum Distillation System

Options and accessories for individual applications

Auto-rinse unit

The VACUDEST® Vacuum Distillation Unit is equipped as standard with a rinse unit for the automatic cleaning of all components in contact with process water, thus drastically reducing the servicing even with heavily contaminated feed. The rinse tank, pneumatic valves and all rinse piping are enclosed in the main system unit. The rinse cycle is automatically initiated, controlled and supervised by the PLC controller.

Minimal maintenance labour

The VACUDEST® Vacuum Distillation Unit is laid out to enable the heat exchanger to be removed by hand very easily for maintenance. In the VACUDEST® 90-2400 the heat-exchanger will be cleaned during the process by the ActivePowerClean-System.

Automatic residue drainage

At the end of the cycle the residues may be ejected under pressure or led if wished to a higher level collection vessel.

Automatic distillate drainage

Distillate is exhausted from the VACUDEST® Vacuum Distillation Unit during processing. It may be piped to a storage vessel either on a higher level or up to several meters away.

ClearCat® for practically free from oil residues

To achieve the highest distillate quality, traces of any entrained or co-distilled oil may be separated with our VACUDEST® ClearCat®. These integrated treatment units are available for sizes 90-1000 of VACUDEST® Vacuum Distillation System.

Zn-Phosphatizing Application -

Zn-phosphatizing Water Treatment with the

VACUDEST® 400 Vacuum Distillation unit

Die Casting Application -

Treatment of die casting emulsions with a

VACUDEST® 90 vacuum evaporator

Process water pre-treatment

In some applications the process water may contain significant quantities of solids or free oil. Rough reduction of gross amounts of such contaminants may be achieved by a belt filter. Small particles and sludge may be reduced with a belt filter or lamellar separator as pre-treatment, without the addition of any consumables.

Free or supernatant oils may be simply removed with a belt or hose skimmer from the surface of the water stream.

Where the pH of the process water is strongly acidic, this may be adjusted automatically before distillation by a neutralisation unit. The pH meter, stirrer and reagent doser may be integrated into the process water feed tank.  

Distillate post treatment

Minor traces of oils or other co-distilled liquid may be removed with activated carbon or a lamellar separator.

Liquid storage

We supply entire tank and pipe work systems for untreated waste, distillate for re-use or disposal, and residues. Integrated level controllers in these vessels ensure a completely automatic process regardless of load.

Pumps

We also install pumps for filling and emptying all tanks controlled with level detectors.

Construction materials

VACUDEST® units are available in special materials to treat waste with difficult contaminants, e.g. chloride. A range of different materials and specifications are available on special request. The vacuum pump is available in corrosion resistant stainless steel.

Vacudest Vacuum Distillation System / Vacuum Evaporation System

Process Diagram

1) Process water inlet -
The liquid level in the evaporator is constant and is maintained automatically so the heat exchanger is always wet.

2) Recuperator -
Preheats the process water with the out-flowing distillate counterflow heat exchanger ensuring optimal heat transfer.

3) Evaporator -
The contaminated process and waste water are concentrated in the evaporator. There are no rotating parts in contact with the waste water and therefore no wear on parts reducing maintenance. The evaporator has been designed to allow easy inspection and maintenance. The system works reliably and safely even with high inlet concentration. The concentration increase is extremely high and the system is more energy efficient than alternatives.

4) ActivePowerClean -
In addition to minimising maintenance the mechanical self-cleaning of the system during operation maintains a high flow rate and maximises heat transfer.

Vacudest Vacuum Distillation System

or Vacuum Evaporator

5) Separator -
The separator is critical to the quality of the distillate. The VACUDEST® system uses a patented high-capacity separator for optimum droplet separation. The separator maximises distillate quality and is suitable for foaming media. A generously dimensioned steam inlet minimises pressure loss and there is a large viewing window for monitoring the process.

6) Vacuum pump -
Generating a vacuum of 600 mbar the vacuum pump heats up the distillate to over 120 °C. The vacuum pump provides temperature control and the contact-free stainless steel rotors minimise energy consumption.

7) QuickStart -
Provides quick heating of the cold system up to operating temperature. There is no electric heating and no wear.

8) Rinsing system -
Fully automatic and maintenance free for all parts exposed to process water.

9) Distillate outlet -
Distillate can be directed up to 3m for reuse without a pump.

10) Concentrate outlet -
The concentrate volume exiting this outlet is between 1 - 10% of the initial volume (depends on inlet concentration) at 3m head without a pump.
 

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This page was last reviewed 06.06.08