Abstract
Biomass fast pyrolysis process is a technology that converts renewable solids into a dense liquid. This study aims to apprehend the thermodynamic behaviour of the Intermediate Liquid Compounds (ILCs) observed during the biomass fast pyrolysis. The system studied was a closed system (20 mL) with air and a mixture solution of five components (Acetic acid (AA), hydroxyacetone (HX), phenol; furfural (FF) and methanol) at 90°C and under atmospheric pressure. The flash calculation was conducted at a given temperature and pressure. The vapor-liquid equilibrium compositions were determined combining equation of state and activity coefficient models, the Soave-Redlich-Kwong (SRK) equation of state coupled with Modified Huron-Vidal (MHV2) mixing rules incorporating the UNIversal Functionnal Activity Coefficient (UNIFAC) model. Theoretical calculations of vapor-liquid equilibrium compositions were experimentally validated by using a Head-Space GC-MS system. A quantitative agreement between simulated and measured concentrations in the liquid phase was achieved with this combined state-predictive model of SRK-MHV2-UNIFAC model; thus, confirming that it accounts well for the nonidealities.
Highlights
To respond to global concerns linked to climate changes caused in a large part by the increasing energy demand and fossil fuels use, alternative and renewable energy solutions such as biomass-based conversion technologies have received considerable attention
A melting phenomenon can be observed in the experiment of pyrolyzing biomass, which is called Intermediate Liquid Compound (ILC)
The incubation setting temperature of the Head-Space system should be lower than 180°C, which is a technical parameter of the equipment and represents an operating limitation to reach for pyrolysis conditions
Summary
To respond to global concerns linked to climate changes caused in a large part by the increasing energy demand and fossil fuels use, alternative and renewable energy solutions such as biomass-based conversion technologies have received considerable attention. Conversion of biomass into liquid fuel, namely bio-oil, using a thermochemical process, most the fast pyrolysis, has received great interest [1]. Fast pyrolysis is the rapid thermal decomposition of organic compounds in the absence of oxygen, which can be considered as the superposition of three degradation processes respectively for the three main components that are cellulose, hemicelluloses and lignin [2].
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