 CORE-PROCESS OF WOTT
|
Core processes of recycling waste oil to base oil are inclusive of discoloration and oxidized substances and dirt rejecting. As to discoloration acid clay filtration or micro-filtration were the main methods in the past, nevertheless, in order to eliminate environment impact, these processes
Solvent extraction technology, for large scale plant Capacity of solvent extraction technology for large scale plant consideration usually could be up to 50,000 KL annually. Capital cost, operation cost, and waste disposal, however, would be the major problems for this technology.
In exception of working times, Purification process is an ideal substitution. In order to increase working efficiency, Purification in associated with LOW working pressure has then become a main stream technology recently.
Different from other similar technology, WOTT use LOW working pressure at about 0.1 mbar in the 1st core process with Thin Film Purifier for water repelling, and followed by a Molecular Purification process with an ultra-LOW working pressure system at a range of 20 pa for base oil recovery at the 2nd core process. |
| |
| WORKING PRINCIPLE |
| |
 1st STAGE |
| |
WATER REJECTION BY MEANS OF THIN FILM PURIFICATION |
| |
|
| |
2nd STAGE |
| |
- REJECTING DIESEL/SOLVENT IF ANY
- DISTILL (RECYCLE) BASE OIL FROM WASTE ENGINE OIL (SPENT LUB/GEAR OIL/HYDROLIC FLUID / METAL COOLING FLUID)
|
| |
|
There are 2 (two) independent core processes that work respectively. The 1st core process is water repelling, feedstock from raw material storage tank conveyed by eccentric internal-gear pump to a Thin Film Purifier (TEP).
In the meantime, the low level Lobe pump starts. Waste water, the heavy phase product from TEP, working at a temperature about 90 C then drop down to the intermediate tank underneath, and oil mixture, the light phase product, ready for next processing, then by-pass to another intermediate tank.
The 2nd core process is prosecuted in a Molecular Purification process system. Depending on properties of waste oil mixture incoming,working temperature in this phase could be various from 250 up to 350 ℃ . |
|
|
|
