Supercritical Extraction of Biomass—A Green and Sustainable Method to Control the Pyrolysis Product Distribution

Abstract

This research demonstrates that supercritical extraction of the biomass has a remarkable and complex influence on Scots pine tree fractions changing the surface concentration of water, lipids, and metals simultaneously. Surprisingly, this surface composition modification makes a considerable impact on the pyrolysis of the bulk biomass mechanism, leading to the alternation of the volatile and inorganic matter composition. The unique combination of time-of-flight secondary-ion mass spectrometry analysis and utilization of pyrolysis gas chromatography-mass spectrometry data on the thermal behavior of woody biomass demonstrates, for the first time, the extraordinary influence of surface adsorbed metals on the composition of pyrolysis products. ScCO2 could extract the surface metals in the form of fatty acid salts, demonstrating a sustainable and environmentally friendly pretreatment method for controlling the pyrolysis products.

Enhanced microwave assisted pyrolysis of waste rice straw through lipid extraction with supercritical carbon dioxide

“…ScCO 2 extraction has been reported as an alternative method of pretreatment prior to enzymatic or thermochemical processes, as it increased the permeability of the biomass surface and inuences the surface composition of elements, which leads to improved downstream processing. 19,48 Previous studies have demonstrated a decrease in surface metal ion concentrations for K + and Na + , in addition to Ca + , Mg + , Al + , and Si + post scCO 2 extraction of Scots pine tree fractions. 19 SEM results indicated that ScCO 2 extraction demonstrated a high efficiency and selectivity to remove valuable phytochemicals without leaving any solvent residue in the rice straw.…”

“…19,48 Previous studies have demonstrated a decrease in surface metal ion concentrations for K + and Na + , in addition to Ca + , Mg + , Al + , and Si + post scCO 2 extraction of Scots pine tree fractions. 19 SEM results indicated that ScCO 2 extraction demonstrated a high efficiency and selectivity to remove valuable phytochemicals without leaving any solvent residue in the rice straw. Therefore, the extracted straw is suitable for further uses in various applications.…”

“…20,23 Recent studies have also demonstrated that the combination of SFE and thermochemical treatment can have a profound effect on product distribution. 19…”

Experimental Study on Drying Biomass with a Spherical Heat Carrier

“…However, due to the stirring effect of the device and the collision of SHC, the surface of the peanut shells was partially broken after desiccation. Compared to extraction, the internal pore channels of peanut shells were exposed, increasing the contact area between the peanut shell fuel and oxygen during subsequent combustion . For biomass with poor thermal conductivity like peanut shells, the rough surface could not only increase the mass transfer in the combustion process but also facilitate the liberation of volatiles …”

Study on the Staged and Direct Fast Pyrolysis Behavior of Waste Pine Sawdust Using High Heating Rate TG-FTIR and Py-GC/MS

“…Also, the contents of aromatics increased at first and later decreased with the increase in pyrolysis temperature. Tubetskaya et al 18 identified that the inorganic contents such as metals found in biomass can act as catalysts for the pyrolysis process, thus influencing the product distribution. It can be inferred that there is an apparent increase in the inorganic content after each step of staged pyrolysis, implying that the subsequent processes can yield high-quality and stable bio-oils.…”