Impact of pretreatment and downstream processing technologies on economics and energy in cellulosic ethanol production

Table 7 Steam demand and lignin energy available for electricity production

Pretreatment Process	Steam demand (kJ/L EtOH)	Steam demand (kJ/kJ biomass)^a	Lignin Energy (kJ/L EtOH)	Lignin Energy (kJ/kJ biomass)^a	Excess Lignin Energy (kJ/L EtOH)	Electricity Produced (kWh/L EtOH)^b
Dilute Acid	19010	0.369	28232	0.548	9223	0.77
Dilute Alkali	18737	0.363	27967	0.542	9229	0.77
Hot Water	19333	0.374	29138	0.563	9804	0.82
Steam Explosion	13508	0.235	34819	0.607	21310	1.78

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