Advanced Analytical Study of Process Streams for a Rational Optimization of Hydrothermal Gasification

Hydrothermal processes are promising technologies for an efficient valorization of wet biomass feedstocks or wastes. Their performance strongly depends on the composition feedstock, and methods to analyze such complex mixtures along with produced effluents in constant progress. Herein, catalytic hydrothermal gasification (cHTG) was used valorize process water from liquefaction pine wood. A detailed analysis streams at various points performed. About 54% feed’s chemical energy could be transferred synthetic natural gas while excellent extraction minerals (98%) into a concentrated brine (27 wt % dry matter) achieved. The low efficiency observed origin 41% 44% loss carbon brine, respectively, were investigated by high-pressure liquid chromatography–high-resolution mass spectrometry (HPLC–HRMS) feed salt separator. This allowed identifying mono- polycarboxylates accounting 71% brine. Increasing temperature separator favor decarboxylation reaction identified as pivotal improve yields, 20-fold decrease carboxylate concentration being reached rise 723 768 K. use two new approaches estimate high heating value (HHV) this rich volatile organic compounds is also reported.