Research Article
Re-refining Used Engine Oil in Ghana Using Solvent Extraction and Acid-Clay Treatment
Table 1
Acid-clay combinations employed in this study for re-refining used engine oil.
| | Acid | Activated clay | Acid-clay combination | Re-refined oil label |
| | Sulphuric acid (H2SO4) | Kaolinite from Mfensi (KM) | H2SO4 + KM | SM | | Kaolinite from Nkroful (KN) | H2SO4 + KN | SN | | Kaolinite from Afienya (KA) | H2SO4 + KA | SA |
| | Nitric acid (HNO3) | Kaolinite from Mfensi (KM) | HNO3 + KM | NM | | Kaolinite from Nkroful (KN) | HNO3 + KN | NN | | Kaolinite from Afienya (KA) | HNO3 + KA | NA |
| | Hydrochloric acid (HCl) | Kaolinite from Mfensi (KM) | HCl + KM | CM | | Kaolinite from Nkroful (KN) | HCl + KN | CN | | Kaolinite from Afienya (KA) | HCl + KA | CA |
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