Table 3 Energy requirements for microwave-enhanced biodiesel production

Specific gravity

-

-

0.86-0.9

0.877

0.86

0.882

0.9

0.89

0.87

0.86

Viscosity

cSt @40ºC

1.9-6

3.5-5

4.22

4.5

4.4

5.38

4.3

6.3

5.2

Pour point

-

10

−12

Sulfur content

0.05% w, max

15 max

2

15

0.008

Carbon residue

0.5 max

0.03

0.05

Flash point

ºC

>93

>101

173

136

165

195

145

130

115

Cetane index

>47

>51

50.9

56.3

62

Oxidation stability

>3

>6

7.5

Copper strip Corrosion index

No 3 max

Class 1

2

1a

Iodine value

g I₂/100 g

-

<120

115.3

83

Heating value

MJ/kg

-

32.5-36.1

38.8

35.8

39.24

39.9

41

Saponification value

mg KOH/g

-

-

181.3

195

Acid value

Mg KOH/g

<0.5

<0.5

0.14

0.276

0.405

0.374

Ester content

%(w/w)

Min 96.5

99.7

99.4

99.4