A feasible process for furfural production from the pre-hydrolysis liquor of corncob via biochar catalysts in a new biphasic system

A feasible approach was developed to produce furfural from the pre-hydrolysis liquor of corncob via biochar catalysts as the solid acid catalyst in a new biphasic system with dichloromethane (DCM) as the organic phase and the concentrated pre-hydrolysis liquor (CPHL) containing NaCl as the aqueous phase. The biochar catalyst possessing many acidity groups (-SO3H, -COOH and phenolic -OH groups) was prepared by the carbonization and sulfonation process of the corncob hydrolyzed residue. The influence of the catalytic condition on furfural yield and selectivity was comparatively studied. It was found that 81.14% furfural yield and 83.0% furfural selectivity were obtained from CPHL containing 5 wt% xylose using this biochar catalyst in the CPHL-NaCl/DCM biphasic system at 170 degrees C for 60 min. In addition, with the regeneration process, this catalyst displayed the high performance and excellent recyclability. (C) 2016 Elsevier Ltd. All rights reserved.