Title:
Hydrothermal Carbonization and Activation of Lignin-Rich Ethanol Co-Product
Author(s):
Miliotti, E., Bettucci, L., Lotti, G., Dell'Orco, S., Rizzo, A.M., Chiaramonti, D.
Document(s):
Paper
Abstract:
The study reported in this paper aims to valorize lignin-rich co-product from 2G ethanol processes as precursor in activated carbon (AC) manufacturing. In particular, hydrothermal carbonization (HTC) was investigated as a pretreatment step for producing suitable AC precursor, and to this end HTC of lignin-rich co-product was performed in a lab-scale stainless steel batch reactor. Experiments were carried out by varying reaction temperature (200-270 °C) and residence time (2-4 h), evaluating the effect of these parameters on the solid yield. Subsequent physical and chemical char activations were performed in a tubular furnace respectively by means of CO2 and KOH. The characteristics in terms of specific surface area, average pore diameter and microporosity of the activated carbons were then analyzed and compared to AC produced with pyrolysis pretreatment (physical activation) and to AC obtained without carbonization (chemical activation). The activated carbon with the highest BET surface area (675 m2/g) was the one produced by chemical activation without the HTC pretreatment. In the case of physical activation, the highest value (630 m2/g) was reached by the AC produced with the mildest HTC severity; the pyrolysis pretreatment showed, however, a similar value (600 m2/g).
Keywords:
activated carbon, lignin, carbonization, HTC, hydrothermal carbonization, lignin-rich co-coproduct
Topic:
Biomass Conversion Technologies for Fuels, Chemicals and Materials
Subtopic:
Production of thermally treated solid biofuels
Event:
26th European Biomass Conference and Exhibition
Session:
3CO.3.4
Pages:
969 - 972
ISBN:
978-88-89407-18-9
Paper DOI:
10.5071/26thEUBCE2018-3CO.3.4
Price:
FREE
