Acidic pretreatments prior to delignification General aspects Acidic pretreatments of lignocellulosic materials (LCMs) are usually performed with some common organic or mineral acids, such as acetic (CH3COOH), sulphuric (H2SO4), hydrochloric (HCl), nitric (HNO3) or trifluoroacetic (F3CCO2H, TFA) acids, of which H2SO4 is the most conventionally used acid due to its availability and cheap price.1-3 Acidic
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