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OT 708

Demulsifier for De-ashing Treatment of Waste Lube Oil Emulsions

For use in treating lube oil emulsions containing oil, water and heavy metals (ash).

OT 708 is a De-ashing Demulsifier designed to typically reduce the ash content of treated emulsions by up to 80-90%.

  • Note: This is a two part process using demulsifier OT 708 together with sulphuric acid. It is important to use only treatment tanks with a corrosion resistant construction.



Where to Use

The process requires a treatment-tank, which, preferably, has the following options:

  • Corrosion resistant construction (i.e. plastic or coated/lined steel) preferred.
  • Mixing or circulating facility (bottom to top).
  • Heating-facility or heat-exchanger installed in the circulating system.
  • Insulation: in order to maintain the temperature during the setting-process.
  • Injection-pump: to add the demulsifier into the oil.

How to Use

The Process consists of the following steps:

  • Fill the treatment tank with the oil-emulsion to be treated.
  • Sample the tank contents to determine the water-content in the oil.
  • If necessary, add extra water and mix in to ensure a total water-content of approximately 20 − 30%.
  • Heat the oil/water mixture to 80°C.
  • Add sulphuric acid to the tank at typically 2,500 ppmv (2.5 litres per m³).
  • Ensure good mixing during and after adding the sulphuric acid.
  • Add Demulsifier OT 708 to the tank (normally between 2,500 and 5,000 ppmv).
  • Ensure good mixing during and after adding the demulsifier.
  • Stop the mixing/circulating and shut off the heating.
  • Leave the contents of the tank to settle for one to three days.

After the settling period the water-phase should be separated at the bottom of the tank. Normally this water-phase is quite acidic: pH=~2. The discharged water-phase will be slightly corrosive, and adequate protection measures are required (Settling tanks, pipelines etc). There will be a thin interphase layer present containing water, oil and “sediments”. Top phase will be the oil, containing typically less than 0.5% of water: the ash-content will be reduced by 80 to 90% compared to the original waste oil to be treated.


Pack Sizes

  • 1000 litre, 200 litre containers.


Technical Data

Appearance Red-brown liquid
pH < 2
SG 1.030
Flash Point >68°C
VOC content N/A

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