Abstract
A techno-economic study of different pretreatments of lignocellulosic biomass (LCB) has been carried out: diluted sulfuric acid (DSA) pretreatment, fractionation of LCB with an ethanol-water mixture (EW), and the same process with liquor reuse (EWR). A simplified analysis was performed considering selected equipment, utilities, and supplies consumption, while also considering the influence of the liquid to solid (L/S) ratio. The equipment cost was found to be similar for the three alternatives, although selected operating costs were somewhat lower for the DSA pretreatment than for the EW. When liquor reuse was considered, EWR costs were significantly reduced. For the case study of L/S of 10, costs were halved under the tested conditions. The influence of the L/S ratio was found to be approximately linear, and correlations were obtained to estimate steam and utilities consumption for different L/S ratios.
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