Optimized Liquid-Liquid Extractive Rerefining of Spent Lubricants

Table 2

Sorted CCD and response data for liquid-liquid extraction of spent lubricant with ketone (methyl ethyl ketone).

Run	Process variables			Response
	𝑡 (h)	𝑇 (°C)	𝑟	𝑌𝐾 (%)	ln(𝑌𝐾)
1	50	60	2	1.1699	0.1569
2	10	35	2	1.3385	0.2915
3	10	60	4	1.4477	0.3700
4	30	60	4	1.7203	0.5425
5	30	35	4	1.9575	0.6717
6	10	35	4	1.0101	0.6982
7	30	35	4	1.0476	0.7167
8	30	35	4	1.0811	0.7329
9	30	60	6	1.1018	0.7428
10	50	35	4	1.2148	0.7952
11	30	35	4	1.2384	0.8058
12	30	35	4	1.3168	0.8402
13	30	10	2	1.3902	0.8714
14	30	35	2	1.4280	0.8871
15	30	35	4	1.4283	0.8872
16	30	35	4	1.4363	0.8905
17	50	35	6	1.4458	0.8944
18	30	35	4	1.4986	0.9157
19	30	35	6	1.6554	0.9766
20	50	10	4	3.1180	1.1372
21	10	10	6	3.4540	1.2395
22	30	10	4	3.7284	1.3160