Techno-economic evaluation of 2nd generation bioethanol production from sugar cane bagasse and leaves integrated with the sugar-based ethanol process

Table 4 2G cost items and MESP-2G, 1G+2G MESP and other economic and energy parameters for all scenarios

Scenario	A	B	C	D	E	F ^a	G	I	J	H ^a	K1 ^a	K2 ^a	L1 ^a	L2 ^a
2G ethanol, L/ton-dSC	45	57	53	76	76	151	95	95	95	136	136	151	61	102
2G cost items, US$/L ^b
Enzymes	0.34	0.33	0.36	0.42	0.47	0.38	0.42	0.42	0.42	0.41	0.41	0.38	0.31	0.28
Acid	0.08	0.08	0.09	0.05	0.06	0.05	0.05	0.05	0.05	0.05	0.06	0.05	0.08	0.07
Base	0.02	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.02	0.02	0.01	0.02	0.02
Water consumption	0.04	0.04	0.04	0.03	0.03	0.02	0.03	0.03	0.02	0.02	0.02	0.02	0.02	0.01
Leaves	0.00	0.00	0.00	0.00	0.00	0.05	0.00	0.00	0.00	0.05	0.05	0.05	0.00	0.07
Labour, maintenance, insurance	0.15	0.12	0.13	0.09	0.08	0.07	0.10	0.09	0.09	0.09	0.08	0.08	0.06	0.06
Electricity export/opportunity cost	0.36	0.31	0.32	0.25	0.27	0.12	0.20	0.19	0.20	0.06	0.08	0.10	0.18	0.01
Vinasse sales	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00
Capital cost	0.56	0.46	0.49	0.34	0.33	0.28	0.36	0.34	0.33	0.34	0.31	0.31	0.22	0.25
MESP-2G	1.55	1.36	1.45	1.19	1.25	0.97	1.16	1.12	1.11	1.05	1.02	0.99	0.88	0.78
1G+2G MESP	0.43	0.44	0.45	0.46	0.47	0.51	0.49	0.48	0.48	0.50	0.51	0.52	0.38	0.40
Internal Rate of Return (%) ^c	15.7	15.4	15.0	14.5	14.1	11.5	12.7	11.5	13.4	13.6	11.2	11.4	21.5	18.8
Total capital cost ( *million US$* )	232	236	234	237	228	299	272	260	259	331	311	334	181	234
Energy parameters
Plant energy efficiency	59.2	61.4	61.4	62.0	61.4	58.9	64.7	64.8	64.9	62.6	61.5	60.5	66.6	63.3
Electricity surplus (kWh/ton SC)	56	50	52	43	41	50	46	48	46	80	74	60	71	106

^a In this scenario sugar cane leaves were added for the 2G ethanol production
^b Cost items for the 2G are calculated according Equation and MESP-2G is the sum of these items
^c The internal rate or return (IRR) is calculated considering the hydrous ethanol selling price of 0.53US$/L, averaged for the years 2008-2011 in the São Paulo State. For the 1G process the IRR is 32.1%

ISSN: 2731-3654