• Distilled engine oil
• Transformer oil
• Hydraulic oil
• Light diesel oil (LDO)
Oil filtration by Activated media is the final polishing process in re-refining of used oil. The process consists of small adsorption columns loaded with a bed of activated media. Generally, distilled oil fed to the top of the media bed and purified oil is collected from the bottom of the column. Once, the breakthrough achieved means activated media has exhausted, need to be reactivated for next batch. There are three major steps :
Distilled oil (From distillation/WFE) can be fed directly to Innosol PetroChem India's Oil Polishing Unit provided the oil color is less than 4 ASTM. We will get the final product once the oil start coming out from the fixed bed percolation columns.
This is the oil quality we can get after passing the oil through fixed bed percolation columns. Left side oil (5-6ASTM, smell) in the bottle shows the quality of oil going to be fed in our Oil Polishing unit. Right side bottle is the oil (No color and smell free) received after passing through the percolation columns.
Once, we start the production of oil from our machine it will give zero color and no smell till 90 minutes. After 90 minutes color of the oil deteriorates to L0.5 ASTM but no smell. Similarly, the color of output deteriorates over the time progressing. Please see the table below. We consider average color of total oil processed. Hence, this batch has Final product quality of oil color less than 1.5 ASTM and no smell. Oil color and No smell will be stable for next 6 months.
| Duration | Quality of Oil (Color, Smell) |
|---|---|
| 0-90 Minutes | 0,0 |
| 90-180 MIN | L0.5,0 |
| 180-240 MIN | L1,0 |
| 240-300 MIN | L1.5,0 |
| 300-360 MIN | L2,0 |
| 360-420 MIN | L2.5,0 |
| 420-480 MIN | L3,0 | Final Product | L1.5, No Smell |
This is the immediate step after regeneration of oil to ready the fix bed columns for the next batch process. Stop the regeneration of oil and purge the hydrocarbon out from media with the help of vacuum. Later, we reactivate the media insitu under controlled temperature. This reactivation is thermal reactivation without using any chemical. Eventually, we have burned off all the adsorbate from the activated media filled inside the columns. Exposure of activated media to elevated temperature will affect the active surface adversely.
Temperature of media/adsorbent inside the columns is high after reactivation hence it needs to be cooled down to below 80°C before take the columns for the production of oil.
Activated Media can be used more than 150 cycles up to 250 cycles, depends on inlet quality of oil.
