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

Table 4

Effects and model coefficients for sulfur removal.

Terms	Mean sum of squares	Coefficients		𝐹-value	𝑃 value	Significance*
		Coded value	Actual value
Constant	41.8	99.8	92.32	17.01	0.000	HS
(H2O2/S) 𝑋1	162	4.5	0.62	65.93	0.000	HS
(Time) 𝑋2	12.5	−1.25	0.013	5.09	0.058	S
(Facid/S) 𝑋3	4.5	0.75	0.042	1.83	0.218	PS
𝑋1𝑋2	25	2.5	0.0038	10.17	0.015	S
𝑋^21	45.63	−3.7	−0.022	18.57	0.003	HS
𝑋^22	4.8	−1.2	−0.0048	1.95	0.02	S
Residual	2.46

^∗HS: highly significant, S: significant, and PS: possibly significant.