clay polishing



Environmentally Friendly

Regenerative Media Based Polishing Systems

Drawing on decades of experience and continuous innovation, Thermopac has developed an adsorbent, RE-GENERATABALE media-based polishing system (also called finishing system) that yields high quality API I base oil without the usage of hazardous solvents or chemicals; or employing potentially hazardous hydrogen treatment plants.

It is designed as an add-on or retrofit to wiped film evaporators; it is equally applicable to other types of refineries as a final polishing stage. When retrofitted onto an existing refinery, it saves millions. Thermopac polishing system can be customized to seamlessly replace your current acid-clay system as well.

BPSPS Polishing System:

  • Improves color
  • Removes odour
  • Reduces sulphur to some extent
  • Reduces organic acidity
  • Improves oxidation stability
  • Has the advantage of higher yields of the finished product when compared with contemporary systems
  • Is the only environmental-friendly option to consumable clay and hazardous solvent extraction systems
  • Is an economical alternative to potentially hazardous hydrogen treatment plants involving very high pressures and temperatures; and hydrogen plants which are governed by explosive regulations.
  • Can be used for parallel or series type of operation.
  • Is a modular system.
  • Is available for global voltages and frequencies.

The non-consumable polishing system works on the principle of adsorption. The unpolished oil product is passed through this special media several times to get a color close to ASTM A 1 and devoid of odour. Furthermore, it results in reduction of some sulphur. Once the media gets saturated, the media undergoes reactivation at elevated temperature. After the completion of the reactivation process, it is cooled to room temperature and it is ready for reuse. The system comes in two sets of regenerative media based polishing systems; when one set is under reactivation, the other set is in polishing mode. The process loss is only the oil that is burnt during the reactivation process, which is approximately 1% of the weight of the media.

A major advantage of using this special media is that once equilibrium efficiency is obtained, no additional reduction in efficiency occurs with further regenerations.

The media can be used multiple times before being disposed of. It is environmental-friendly; the waste can be directly disposed of at a local landfill without any pre-treatment.

The process does not suffer from any of the following drawbacks encountered in the contemporary method of solvent extraction:


  • The solvent extraction system needs de-aeration and inert gas blanketing to check deterioration due to oxidation and polymerization.
  • It requires azeotropic distillation for solvent purification.
  • It should be noted that none of the solvents available is perfectly selective for aromatics.
  • Solvent extraction by itself is not a sufficient process; it must be used in combination with other processes.
  • One major drawback of solvent extraction is that it removes the unsaturated compounds without conversion, reducing the overall yield.
  • It produces API II specification is a false statement because of its inability to remove suphur.
  • The health hazards of solvents like NMP need not be over emphasized. The toxic effects of NMP have been documented. When protective measures are not taken, it can cause damage to human organs such as reproductive system, eyes, nose, throat, skin and nervous system.
Thermopac Polishing System
Sr No. Parameters Test Method Unit HFD
1 Appearance Visual Clear and Bright
2 Colour ASTM –D 1500 <3.0
3 Density at 15 deg C ASTM -D 1298 gm/mL 0.85 – 0.87
4 Kinematic Viscosity at 50 deg C ASTM -D 445 cSt 16- 22
5 Moisture content ASTM –D 95 %vol Nil
6 Sulphur Content, max ASTM -D 4294 %w/w 0.3
7 Flash point (PMCC), min ASTM -D 93 Deg. C 100
8 Ash Content ASTM -D 93 %w/w Nil
9 Conradson Carbon Residue, max ASTM -D 189 %w/w 0.1
10 Gross Calorific Value ASTM -D 4868 kcal/kg >10000
11 Net Calorific Value ASTM -D 4868 kcal/kg >9000

Contact Us

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 Call: +983832262243

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