Production of Biodiesel from Waste Vegetable Oil via KM Micromixer

Table 4

FT-IR main characteristic band positions for waste vegetable oil and prepared biodiesel.

Waste vegetable oil		Biodiesel
Characteristic absorption vibrations cm^−1	Functional group	Characteristic absorption vibrations cm^−1	Functional group
721	-CH2 rocking	721	-CH2 rocking
1373.7	Bending vibrations of CH2 groups	1363.54	Bending vibrations of CH2 groups
1745	C=O ester stretch	1742	C=O ester stretch
1163	C-O stretching	1195; 1168; 1110.21	Split C-O stretching; Split C-O stretching; -O-CH2-C
1456	Bending vibrations of the CH2	1434	Methyl ester group (CO-O-CH3)
2925	-CH2 stretching	2933.5	-CH2 stretching