Bio-ethanol production from wet coffee processing waste in Ethiopia

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Table 1 Summary of gas chromatogram of bio-ethanol concentration determination

Sample	Reten. time (min)	Area (mV s)	Height (mV)	Area (%)	Height (%)
Pure ethanol (95%)	0.639	5069	893	100	100
Pure ethanol (95%)	Total	5069	893	100	100
Sample hydrolyzed by 0.2 M H₂SO₄	0.283	1623	241	31.3	23.7
	0.616	3565	774	68.7	76.3
	Total	5188	1014	100	100
Sample hydrolyzed by 0.2 M H₂SO₄ + 2 mL of pure ethanol (95%) added	0.276	2148	402	24.4	31.4
	0.639	6665	879	75.6	68.6
	Total	8813	1281	100	100
Sample hydrolyzed by 0.4 M H₂SO₄	0.286	2101	300	22.0	25.5
	0.632	7450	875	78.0	74.5
	Total	9551	1175	100	100
Sample hydrolyzed by 0.6 M H₂SO₄	0.283	2528	315	24.5	24.5
	0.609	7804	885	75.5	73.8
	Total	10,332	1199	100	100
Sample hydrolyzed by 0.8 M H₂SO₄	0.303	2624	183	29.6	21.0
	0.622	6233	688	70.4	79.0
	Total	8857	871	100	100
Sample hydrolyzed by 1 M H₂SO₄	0.280	3296	241	36.5	23.4
	0.616	5735	789	63.5	76.6
	Total	9031	1030	100	100
Sample hydrolyzed by distilled water	0.310	15,724	937	70.2	52.9
	0.636	6680	833	29.8	47.1
	Total	22,404	1770	100	100