Comprehensive process for selectively separating lignocellulosic biomass into purified components with high yield
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United States of America Patent
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Dec 4, 2018
Grant Date -
Aug 31, 2017
app pub date -
Aug 28, 2015
filing date -
Aug 29, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
A comprehensive process for treating lignocellulosic biomass in order to separate the biomass into its component parts, the process comprising: a) contacting the lignocellulosic biomass with a first solvent for a period of time and at a first temperature at a severity in the range of about 2 to about 4 to remove extractive components and a portion of ash from the biomass; b) contacting the biomass from step (a) with a second solvent, and optional catalyst, at a second temperature at a severity in the range of about 1 to 5 to remove hemicelluloses and additional ash from the biomass; and c) separating the biomass from step (b) into a lignin product and a cellulose product by contacting the biomass from step (b) with a third solvent at a severity in the range of about 1.5 to 5 to provide a spent liquor product and a solid fraction containing cellulose.
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International Classification(s)
- D01D:MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE....
- D01C:CHEMICAL TREATMENT OF NATURAL FILAMENTARY OR FIBRO....
- C08H:DERIVATIVES OF NATURAL MACROMOLECULAR COMPOUNDS
- C08B:POLYSACCHARIDES; DERIVATIVES THEREOF
- D01F:CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL....
- D21C:PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE ....
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