Filter Cake Oil-Wax as Raw Material for the Production of Biodiesel: Analysis of the Extraction Process and the Transesterification Reaction

Table 1

Fatty acid concentrations and acid values of the extracts obtained by Soxhlet, OSE, UAE, and SFE.

	Fatty acid composition (mg/kg)					Acid value
	Palmitic (C16:0)	Stearic (C18:0)	Oleic (C18:1)	Linoleic (C18:2)	Linolenic (C18:3)
Soxhlet	11.5	24.5	2.38	5.28	6.40	6.55
OSE (3 : 1)	3.3	5.6	n.d	0.4	1.6	15.93
OSE (5 : 1)	9.4	15.7	7.5	17.6	15.7	12.18
OSE (7 : 1)	10.7	20.2	n.d	n.d	5.8	12.19
OSE (9 : 1)	12.1	27.3	n.d	0.8	3.9	13.57
UAE ()	7.6	17.9	n.d	0.1	2.5	8.46
UAE ()	3.40	8.96	0.4	0.5	1.9	4.43
SFE CO2
200 bar/35°C	75.09	38.79	143.07	160.66	21.65	19.35
200 bar/55°C	63.66	44.55	144.16	131.66	6.8	26.02
400 bar/35°C	106.30	77.10	226.59	205.29	10.85	22.21
400 bar/55°C	83.69	79.19	175.37	162.46	13.7	24.45
SFE CO2/methanol
200 bar/35°C	14.51	23.54	5.31	4.44	2.65	29.44
200 bar/55°C	15.89	26.58	6.00	5.01	2.70	22.41
400 bar/35°C	23.63	37.51	5.64	5.53	3.87	11.58
400 bar/55°C	25.13	43.65	5.36	5.72	3.47	20.57