Investigation of Influential Parameters in Deep Oxidative Desulfurization of Dibenzothiophene with Hydrogen Peroxide and Formic Acid

Table 3

Coded and actual levels of variables with corresponding responses (initial sulfur concentration = 250 ppmw).

Experiment no.	Coded level of variables			Actual level of variables			Responses
	𝑋1	𝑋2	𝑋3	𝑋1	𝑋2	𝑋3	S removal (%)	S (ppm)
1	−1	−1	0	2	50	20	95	12.5
2	1	−1	0	28	50	20	100	0
3	−1	1	0	2	150	20	85	37.5
4	1	1	0	28	150	20	100	0
5	−1	0	−1	2	100	2	91	22.5
6	1	0	−1	28	100	2	100	0
7	−1	0	1	2	100	38	93	17.5
8	1	0	1	28	100	38	100	0
9	0	−1	−1	15	50	2	98	5
10	0	1	−1	15	150	2	97	7.5
11	0	−1	1	15	50	38	99	2.5
12	0	1	1	15	150	38	100	0
13	0	0	0	15	100	20	100	0
14	0	0	0	15	100	20	100	0
15	0	0	0	15	100	20	100	0