Regeneration of Spent Lubricant Refining Clays by Solvent Extraction

Table 4

Extraction procedure of different times.

Extraction times	Extraction times
	Extraction with solvent B	Extraction with solvents B and E	Extraction with solvent E
2	1	1	0
3	1	2	0
4	1	2	1
5	2	2	1
6	2	2	2