This paper presents the upgrading of HTL (Hydrothermal Liquefaction) bio oil produced by from various sources such as sewage sludge and food wastes. The HTL oil was hydrotreated over a CoMo/Al2O3 (guardbed) and NiMo/Al2O3 (mainbed) catalysts at WHSV 0.5hr-1, 400°C and 1500 psi. The steady state densities (at 40°C) were 0.79 and 0.81 g/ml for HTL biocrude derived from sewage sludge and food waste, respectively. After 1500 hours of steady state operation, variations in process conditions that affect the hydrotreating performance had been identified in the following order; Pressure>WHSV>Temperature. Pressure had huge impact on the hydrotreating performance. The hydrotreating efficiency was reestablished to base line conditions with minimal deactivation of catalyst at 2000 hours run time.
Published: November 11, 2021
Citation
Subramaniam S., D.M. Santosa, C.O. Brady, M.S. Swita, K. Kallupalayam Ramasamy, and M.R. Thorson. 2021.Extended catalyst lifetime testing for HTL biocrude hydrotreating to produce fuel blendstocks from wet wastes.ACS Sustainable Chemistry & Engineering 9, no. 38:12825–12832.PNNL-SA-161175.doi:10.1021/acssuschemeng.1c02743