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Table 1 Range and levels of independent variables

From: Process optimization of Calophyllum inophyllum-waste cooking oil mixture for biodiesel production using Donax deltoides shells as heterogeneous catalyst

Name

Symbols

Units

(−) α

Low

Middle

High

(+) α

Catalyst concentration

A

wt%

4.64

6

8

10

11.36

Methanol to oil ratio

B

% (v/v)

55.18

62

72

82

88.82

Reaction time

C

Min

99.55

120

150

180

200.45

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Sustainable Environment Research

ISSN: 2468-2039

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