PROCESSES AND APPARATUS FOR MANAGING AND RECYCLING SULFUR DIOXIDE IN BIOREFINERIES
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United States of America Patent
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Issued Date -
Sep 3, 2015
app pub date -
Feb 12, 2015
filing date -
Feb 28, 2014
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Abandoned
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Abstract
What is disclosed is a biorefining process and system including the steps of extracting, hydrolyzing, and/or digesting a lignocellulosic biomass feedstock, or a component thereof, with a liquid or vapor solution comprising reactant sulfur dioxide or a derivative thereof, to generate cellulose-rich solids and an intermediate liquid stream; combusting or gasifying a sulfur-containing fuel to generate heat and an exhaust gas stream comprising produced sulfur dioxide; contacting the exhaust gas stream with the intermediate liquid stream to dissolve the produced sulfur dioxide into the intermediate liquid stream; and then recycling the intermediate liquid stream to reuse the produced sulfur dioxide as the reactant sulfur dioxide. The sulfur-containing fuel may be sulfonated lignin generated by reaction of lignin (derived from the feedstock) with the reactant sulfur dioxide, resulting in a closed loop for sulfur dioxide in the biorefinery.
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