Effect of Pressure and Hot Vapor Residence Time on the Fast Pyrolysis of Biomass: Experiments and Modeling

P.S. Marathe; R.J.M. Westerhof; S.R.A. Kersten

doi:10.1021/acs.energyfuels.9b03193

Effect of Pressure and Hot Vapor Residence Time on the Fast Pyrolysis of Biomass: Experiments and Modeling

P.S. Marathe, R.J.M. Westerhof, S.R.A. Kersten^*

^*Corresponding author for this work

Sustainable Process Technology

Research output: Contribution to journal › Article › Academic › peer-review

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Abstract

Pyrolysis of acid-leached bagasse (515 °C) and pinewood (485 °C) has been carried out in the pressure range from 5 × 10^-3 to 100 kPa in a screen-heater, designed for nearly isothermal operation and rapid quenching of reaction products. At the lowest pressure, i.e., by maximizing the escape rate of products away from the hot reaction zone, 73% of the poly-C₆-sugars in bagasse were recovered in the liquid product as C₆-anhydrosugars (C₆aS) with degree of polymerization between 1 and 6 (DP₁ to DP₆). A mathematical model, including reactions and mass transfer, was able to predict the measured decrease in the total yield of C₆aS and the shift to lighter C₆aS in the DP-distribution as a function of increasing pressure. The effect of the hot vapor residence time on the DP-distribution of the C₆aS was investigated by pyrolyzing pinewood in a fluidized bed. At identical pressure (50 kPa) and temperature (485 °C) the total yield of C₆aS was the same for the screen-heater and fluidized bed while the DP-distribution shifted to DP₁ as a result of the higher hot vapor residence time in the fluidized bed, which could be described by assuming first order kinetics for all possible cracking reactions of C₆aS in the vapor phase.

Original language	English
Pages (from-to)	1773-1780
Number of pages	8
Journal	Energy & fuels
Volume	34
Issue number	2
DOIs	https://doi.org/10.1021/acs.energyfuels.9b03193
Publication status	Published - 20 Feb 2020

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UT-Hybrid-D

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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title = "Effect of Pressure and Hot Vapor Residence Time on the Fast Pyrolysis of Biomass: Experiments and Modeling",

abstract = "Pyrolysis of acid-leached bagasse (515 °C) and pinewood (485 °C) has been carried out in the pressure range from 5 × 10-3 to 100 kPa in a screen-heater, designed for nearly isothermal operation and rapid quenching of reaction products. At the lowest pressure, i.e., by maximizing the escape rate of products away from the hot reaction zone, 73% of the poly-C6-sugars in bagasse were recovered in the liquid product as C6-anhydrosugars (C6aS) with degree of polymerization between 1 and 6 (DP1 to DP6). A mathematical model, including reactions and mass transfer, was able to predict the measured decrease in the total yield of C6aS and the shift to lighter C6aS in the DP-distribution as a function of increasing pressure. The effect of the hot vapor residence time on the DP-distribution of the C6aS was investigated by pyrolyzing pinewood in a fluidized bed. At identical pressure (50 kPa) and temperature (485 °C) the total yield of C6aS was the same for the screen-heater and fluidized bed while the DP-distribution shifted to DP1 as a result of the higher hot vapor residence time in the fluidized bed, which could be described by assuming first order kinetics for all possible cracking reactions of C6aS in the vapor phase.",

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AB - Pyrolysis of acid-leached bagasse (515 °C) and pinewood (485 °C) has been carried out in the pressure range from 5 × 10-3 to 100 kPa in a screen-heater, designed for nearly isothermal operation and rapid quenching of reaction products. At the lowest pressure, i.e., by maximizing the escape rate of products away from the hot reaction zone, 73% of the poly-C6-sugars in bagasse were recovered in the liquid product as C6-anhydrosugars (C6aS) with degree of polymerization between 1 and 6 (DP1 to DP6). A mathematical model, including reactions and mass transfer, was able to predict the measured decrease in the total yield of C6aS and the shift to lighter C6aS in the DP-distribution as a function of increasing pressure. The effect of the hot vapor residence time on the DP-distribution of the C6aS was investigated by pyrolyzing pinewood in a fluidized bed. At identical pressure (50 kPa) and temperature (485 °C) the total yield of C6aS was the same for the screen-heater and fluidized bed while the DP-distribution shifted to DP1 as a result of the higher hot vapor residence time in the fluidized bed, which could be described by assuming first order kinetics for all possible cracking reactions of C6aS in the vapor phase.

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Effect of Pressure and Hot Vapor Residence Time on the Fast Pyrolysis of Biomass: Experiments and Modeling

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UN SDGs

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