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Bioresources and Bioprocessing

Table 1 Range and level of the variables based on the parametric study

From: Response surface optimization of biodiesel yield from pre-treated waste oil of rendered pork from a food processing industry

Independent variable

Coded level

− 2

− 1

0

1

2

Methanol–oil ratio (mol)

2

3

4

5

6

Amount of catalyst (wt%)

0.25

0.50

0.75

1.00

1.25

Reaction time (min)

30

45

60

75

90

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