화학공학소재연구정보센터
Renewable Energy, Vol.151, 103-117, 2020
Biodiesel purification using biomass-based adsorbent manufactured from delignified olive cake residues
In this work, olive cake was treated by applying the alkali hydrolysis process in order to produce an adsorbent material for biodiesel purification. The treatment was performed with an aqueous solution of 7.5 wt% NaOH in a solid-to-liquid mass ratio of 1:6 at 90 degrees C followed by filtration, washing, drying, and sieving. The structure and composition of the delignified residue were investigated by XRD, FT-IR, BET, and SEM analysis to better understand its properties as an adsorbent. The study revealed that using an adsorbent of size <90-mu m, 2 wt% adsorbent to biodiesel ratio and contact time of 40 min resulted in higher yield and better fuel properties compared to those purified using water washing method. At the same time, such enhanced properties fulfilled the ASTM 6751 and EN 14214 biodiesel standards. Therefore, the alkali residue can act as a replacement for commercial adsorbents for biodiesel purification. Further, the adsorption isotherm of this alkali residue was adequately described by the Freundlich model. (C) 2019 Elsevier Ltd. All rights reserved.