Clean Technology (청정기술)

The Korean Society of Clean Technology (한국청정기술학회)
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Hydrodeoxygenation of Spent Coffee Bio-oil from Fast Pyrolysis using HZSM-5 and Dolomite Catalysts

  • Park, Jeong Woo (Department of Chemical Engineering, Kangwon National University) ;
  • Ly, Hoang Vu (Department of Chemical Engineering, Kangwon National University) ;
  • Linh, Le Manh (Department of Chemical Engineering, Kangwon National University) ;
  • Tran, Quoc Khanh (Department of Chemical Engineering, Kangwon National University) ;
  • Kim, Seung-Soo (Department of Chemical Engineering, Kangwon National University) ;
  • Kim, Jinsoo (Department of Chemical Engineering, Kyung Hee University)
  • Received : 2019.05.03
  • Accepted : 2019.05.20
  • Published : 2019.06.30
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Abstract

Spent coffee is one of biomass sources to be converted into bio-oil. However, the bio-oil should be further upgraded to achieve a higher quality bio-oil because of its high oxygen content. Deoxygenation under hydrotreating using different catalysts (catalytic hydrodeoxygenation; HDO) is considered as one of the promising methods for upgrading bio-oil from pyrolysis by removal of O-containing groups. In this study, the HDO of spent coffee bio-oil, which was collected from fast pyrolysis of spent coffee ($460^{\circ}C$, $2.0{\times}U_{mf}$), was carried out in an autoclave. The product yields were 72.16 ~ 96.76 wt% of bio-oil, 0 ~ 18.59 wt% of char, and 3.24 ~ 9.25 wt% of gas obtained in 30 min at temperatures between $250^{\circ}C$ and $350^{\circ}C$ and pressure in the range of 3 to 9 bar. The highest yield of bio-oil of 97.13% was achieved at $250^{\circ}C$ and 3 bar, with high selectivity of D-Allose. The carbon number distribution of the bio-oil was analyzed based on the concept of simulated distillation. The $C_{12}{\sim}C_{14}$ fraction increased from 22.98 wt% to 27.30 wt%, whereas the $C_{19}{\sim}C_{26}$ fraction decreased from 24.74 wt% to 17.18 wt% with increasing reaction time. Bio-oil yields were slightly decreased when the HZSM-5 catalyst and dolomite were used. The selectivity of CO was increased at the HZSM-5 catalyst and decreased at the dolomite.

Keywords

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Figure 1. Schematic diagram of a bubbling fluidized bed reactor for fast pyrolysis.

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Figure 2. Schematic diagram of an autoclave reactor.

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Figure 3. Thermogravimetric (TG) and differential thermogravimetric (DTG) curves for the spent coffee (a) and spent coffee bio-oil (b) at heating rate of 10 ℃ min-1.

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Figure 4. Carbon number distribution of spent coffee bio-oil and HDO of spent coffee bio-oil at different reaction conditions.

Table 1. Characteristics of spent coffee and spent coffee bio-oil

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Table 2. The effect of different reaction conditions on product distribution of SCO in an autoclave reactor, at reaction time of 60 min

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Table 3. Composition of bio-oil produced by HDO of SCO at 250 ℃, 3 bar with dolomite and HZSM-5 catalysts

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Table 3. To be Continue

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