Active Razor Shell CaO Catalyst Synthesis for Jatropha Methyl Ester Production via Optimized Two-Step Transesterification

Table 3

Estimated response surface regression coefficients for optimal JME yield using uncoded units.

Term	Coef.	SE coef.
Constant	100.071	1.0485	95.447	0.000
Block	−1.819	0.4824	−3.771	0.003
Linear
	0.262	1.0603	0.247	0.810
	6.707	1.1903	5.635	0.000
	4.002	1.0721	3.733	0.003
	4.515	1.0907	4.140	0.002
	0.931	1.0721	0.868	0.404
Quadratic
	−11.439	1.9574	−5.844	0.000
	−14.186	1.9517	−7.269	0.000
	−14.224	1.9047	−7.468	0.000
	−11.824	1.9047	−6.208	0.000
	−6.524	1.9047	−3.425	0.006
Interaction
	4.379	3.0693	1.427	0.181
	0.493	2.6488	0.186	0.856
	−0.846	2.7161	−0.312	0.761
	−0.193	2.6488	−0.073	0.943
	−2.021	3.0062	−0.672	0.515
	−4.479	3.0693	−1.459	0.172
	0.721	3.0062	0.240	0.815
	−1.393	2.6488	−0.526	0.609
	3.754	2.7161	1.382	0.194
	−1.707	2.6488	-0.645	0.532