HYBRID BIOREFINING AND GASIFICATION OF LIGNOCELLULOSIC FEEDSTOCKS
First Claim
4. A process according to claim 3, wherein the processed stillage waste stream is concurrently gasified with the cellulosic solids output stream.
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Accused Products
Abstract
Processes and systems for concurrent recovery of lignin derivatives and syngas from a lignocellulosic feedstock. The processes and systems therefor generally comprise the steps of: (a) perfusing and cooking the lignocellulosic feedstock with a suitable organic solvent for a suitable period of time thereby producing a cellulosic solids output stream and a spent liquid solvent stream, said spent liquid solvent stream comprising solubilized lignin derivatives and other organic compounds; (b) separating said cellulosic solids output stream and said spent liquid solvent stream; (c) recovering lignin derivatives from the spent liquid solvent stream thereby producing at least a partially de-lignified spent liquid solvent stream; (d) recovering a portion of the organic solvent from the at least partially de-lignified spent liquid solvent stream thereby producing a stillage; and (e) gasifying the cellulosic solids output stream thereby producing a combustible syngas.
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Citations
19 Claims
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4. A process according to claim 3, wherein the processed stillage waste stream is concurrently gasified with the cellulosic solids output stream.
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11. A biorefining system for recovering lignin derivatives from lignocellulosic feedstocks, the system comprising:
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a pulping unit configured to receive and process a lignocellulosic feedstock with an organic solvent to separate therefrom a cellulosic solids stream and a spent solvent black liquor stream comprising solubilized plant components; a black liquor processing unit configured to receive and process the black liquor stream for separation and recovery therefrom of a plurality of lignin derivatives, a portion of the organic solvent, and at least a partially de-lignified stillage; and a gasification unit configured to receive and gasify the cellulosic solids stream and to recover therefrom a syngas stream. - View Dependent Claims (1, 2, 3, 5, 6, 7, 8, 9, 10, 12, 13, 14, 15, 16, 17)
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16-2. A biorefining system according to claim 11, wherein the gasification unit is additionally configured to convert a portion of the syngas stream into one of alkanes, olefins, oxygenates and biodiesel by a Fischer-Tropsch reaction.
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17-3. A biorefining system according to claim 11, wherein the gasification unit is configured for concurrent conversion of a portion of the syngas stream into a short-chain alcohol and one of lkanes, olefins, oxygenates and biodiesel.
- 18. A biorefining system according to claim 16, wherein the gasification unit is configured for conversion of the syngas stream into a short-chain alcohol by at least one catalyzed chemical reaction.
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18-1. A biorefining system according to claim 16, wherein the gasification unit is configured for conversion of the syngas stream into a short-chain alcohol by a fermentation process.
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18-4. A modular biorefining system for recovering lignin derivatives from lignocellulosic feedstocks, the system comprising:
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a first module comprising a pulping unit configured to receive and process a lignocellulosic feedstock with an organic solvent to separate therefrom a cellulosic solids stream and a black liquor stream comprising solubilized plant components; a second module comprising a black liquor processing unit configured to receive and process the black liquor stream to separate and recover therefrom a plurality of lignin derivatives, a portion of the organic solvent, and a de-lignified stillage; and a third module comprising a gasification unit configured to receive and gasify the cellulosic solids stream and to recover therefrom a syngas stream.
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Specification