Waste to Energy: Response Surface Methodology for Optimization of Biodiesel Production from Leather Fleshing Waste

Table 2

Physicochemical characterization of untreated and treated fleshing oil.

S.No	Parameters	Unit	Fleshing oil before treatment			Fleshing oil after treatment
			goat	sheep	hide	goat	sheep	hide
1.	Density @ 298.15 K	Kg/m^3	911	905	900	906	900	895
2.	Water content @ 378.15 K	% mass	0.4	0.3	0.15	0.32	0.24	0.04
3.	Kinematic viscosity @ 313.15 K	mm^2/s	70.8	40.2	30.9	57.8	27.65	21.23
4.	Acid value	mg KOH/g	6.1	3.5	3.25	1.13	2.8	2.7
5.	FFA	%	3.05	1.75	1.63	0.56	1.4	1.35
6.	Saponification value	mg KOH/g	165.6	198.6	191.57	148.1	170.5	171.3
7.	Higher heating value	MJ/Kg	42.2	40.2	42.43	42.38	40.86	43.13
8.	Iodine value	g/100g	66	74	80	65.13	65	75