PROCESSES AND SYSTEMS FOR BIOMASS IMPREGNATION TO IMPROVE CONVERSION TO SUGARS, CHEMICALS, FUELS, AND MATERIALS
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United States of America Patent
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May 6, 2021
app pub date -
Oct 10, 2020
filing date -
Oct 11, 2019
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Some variations provide a process for impregnating a biomass feedstock with a reaction solution, comprising: providing a biomass feedstock that contains non-condensable gases within biomass pores; introducing a condensable vapor into the biomass pores to remove non-condensable gases out of the biomass pores, thereby generating an intermediate biomass material, wherein at least a portion of the condensable vapor remains within the biomass pores; exposing the intermediate biomass material to a liquid solution to infiltrate the liquid solution into the biomass pores and condense the vapor to form a condensed liquid contained within the biomass pores, thereby generating an impregnated biomass material containing a reaction solution; and recovering or further processing the impregnated biomass material. The non-condensable gases may be oxygen, nitrogen, or carbon dioxide, for example. The condensable vapor may be steam, for example. The reaction solution may contain a pretreatment chemical, such as a catalyst and/or a solvent.
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