(723f) Continuous Hydrodeoxygenation of Liquid Phase Pyrolysis Oil

Authors: 
Schwaiger, N., Graz University of Technology
Treusch, K., Graz University of Technology
Ritzberger, J., Graz University of Technology
Nagl, R., Graz, University of Technology
Pucher, P., BDI - BioEnergy International GmbH
Siebenhofer, M., Graz University of Technology

Continuous Hydrodeoxygenation of
Liquid Phase Pyrolysis Oil

Liquid phase pyrolysis

Non-renewable energy resources such as oil and
coal will not suffice the increasing demand of energy in the future. To fill
the upcoming gap a biomass liquefaction concept has been developed. This
concept consists of two main process steps. In the first step lignocellulosic biomass is converted into pyrolysis oil and
pyrolysis char through the bioCRACK process1.
In the second step the intermediate products are upgraded. Two upgrading
technologies were investigated: hydrodeoxygenation
(HDO) of pyrolysis oil2 and hydrogenation of pyrolysis char. The bioCRACK process was successfully operated in pilot scale
(100 kg/h lignocellulosic feed) over two years.

Continuous HDO of liquid phase pyrolysis oil

Liquid phase pyrolysis oil was upgraded by
continuous hydrodeoxygenation in lab scale. Hydrotreatment was performed catalytically in a plugflow reactor. Operation parameters were 400°C and 121
bar hydrogen pressure. Lab scale results showed a carbon yield of 38% in the
fuel phase with a carbon content of 86,15% and a hydrogen content of 13.35%.
Fuel boiling range is shown in figure 1. The boiling range is between diesel
and gasoline.

Figure  SEQ Figure \* ARABIC 1: boiling range of HDO fuel from liquid phase pyrolysis oil

Direct liquefaction of pyrolysis char was
carried out in lab scale catalytically and non-catalytically. Non-catalytic biochar liquefaction showed a conversion of 84% and an oil
yield of 72%3, catalytic biochar
liquefaction resulted in 100% conversion and 95% oil yield.

The design parameters for pilot scale of the hydrodeoxygenation technology as well as the hydrogenation
technology (upgrade of pyrolysis oil as well as biochar)
are under evaluation.

ADDIN Mendeley Bibliography CSL_BIBLIOGRAPHY (1)      Schwaiger,
N.; Elliott, D. C.; Ritzberger, J.; Wang, H.; Pucher, P.; Siebenhofer, M. Green
Chem.
2015, 17, 2487–2494.

(2)      Pucher, H.; Schwaiger, N.; Feiner, R.;
Ellmaier, L.; Pucher, P.; Chernev, B.; Siebenhofer, M. Green Chem. 2015,
17, 1291–1298.

(3)      Feiner, R.; Schwaiger, N.; Pucher, H. RSC
Adv.
2013, 3, 17898–17903.