Optimized Liquid-Liquid Extractive Rerefining of Spent Lubricants

Table 1

Sorted CCD and response data for liquid-liquid extraction of spent lubricant with alcohol (1-butanol).

Run	Process variables			Response
	𝑡 (h)	𝑇 (°C)	𝑟	𝑌𝐴 (%)	ln(𝑌𝐴)
1	30	60	6	1.8868	0.6349
2	10	60	4	1.0476	0.7167
3	10	35	4	1.1041	0.7439
4	10	10	6	1.1727	0.7760
5	30	35	6	1.1935	0.7855
6	50	60	2	1.2272	0.8007
7	50	10	4	1.3295	0.8457
8	30	35	4	1.4789	0.9078
9	50	35	4	1.5488	0.9356
10	30	35	4	1.5627	0.9411
11	30	35	4	1.5641	0.9416
12	30	35	4	1.5924	0.9526
13	50	35	6	1.5932	0.9529
14	30	60	4	1.6111	0.9598
15	30	35	4	1.7177	0.9998
16	30	10	4	1.8255	1.0387
17	30	35	4	1.8899	1.0612
18	30	35	4	1.9362	1.0771
19	30	35	4	3.1844	1.1583
20	30	35	2	3.3053	1.1955
21	30	10	2	3.9488	1.3734
22	10	35	2	4.8753	1.5842