The influence of solid/liquid separation techniques on the sugar yield in two-step dilute acid hydrolysis of softwood followed by enzymatic hydrolysis |
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Authors: | Sanam Monavari Mats Galbe Guido Zacchi |
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Institution: | (1) Department of Chemical Engineering, Lund University, SE-221 00 Lund, Sweden |
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Abstract: | Background Two-step dilute acid hydrolysis of softwood, either as a stand-alone process or as pretreatment before enzymatic hydrolysis,
is considered to result in higher sugar yields than one-step acid hydrolysis. However, this requires removal of the liquid
between the two steps. In an industrial process, filtration and washing of the material between the two steps is difficult,
as it should be performed at high pressure to reduce energy demand. Moreover, the application of pressure leads to more compact
solids, which may affect subsequent processing steps. This study was carried out to investigate the influence of pressing
the biomass, in combination with the effects of not washing the material, on the sugar yield obtained from two-step dilute
acid hydrolysis, with and without subsequent enzymatic digestion of the solids. |
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