Method to recycle an aqueous acidic liquor used for depolymerization of cellulose
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C07H-003/00
C13K-001/02
출원번호
US-0224700
(1999-01-04)
발명자
/ 주소
Lightner Gene E.
인용정보
피인용 횟수 :
32인용 특허 :
4
초록▼
A method to recycle aqueous acidic liquor used to form depolymerized cellulose and hemicellulose accompanying cellulose, contained in biomass, by hydrolysis in the aqueous acidic liquor. Cellulose is dissolved in the aqueous acidic liquor and then remains in place to hydrolyze cellulose to form depo
A method to recycle aqueous acidic liquor used to form depolymerized cellulose and hemicellulose accompanying cellulose, contained in biomass, by hydrolysis in the aqueous acidic liquor. Cellulose is dissolved in the aqueous acidic liquor and then remains in place to hydrolyze cellulose to form depolymerized cellulose in the aqueous acidic liquor. The depolymerized cellulose, including dextrins, oligosaccharides, and glucose is substantially separated from the aqueous acidic liquor. The separated aqueous acidic liquor is then recycled to dissolve and hydrolyze additional cellulose to form additional depolymerized cellulose.
대표청구항▼
[ What is claimed is:] [1.] A method to recycle an aqueous acidic liquor employed to subject glycoside bonds, contained in cellulose, to become substantially accessible to protons contained in the aqueous acidic liquor followed by hydrolysis in place to depolymerize the cellulose and hemicellulose a
[ What is claimed is:] [1.] A method to recycle an aqueous acidic liquor employed to subject glycoside bonds, contained in cellulose, to become substantially accessible to protons contained in the aqueous acidic liquor followed by hydrolysis in place to depolymerize the cellulose and hemicellulose accompanying the cellulose to provide water soluble depolymerized polymers and water insoluble solids also accompanying the cellulose, which comprises:mixing together said aqueous acidic liquor containing said depolymerized polymers with an extractate from a previous extraction containing a solvent which is substantially soluble in said aqueous acidic liquor but substantially insoluble in said depolymerized polymers to form a precipitate of said depolymerized polymers, andsetting apart to substantially divide the heretofore precipitated depolymerized polymers from a liquid containing said aqueous acidic liquor and said solvent, andextracting, by counter flow, heretofore precipitated depolymerized polymers with supplementary solvent to substantially extract any residual aqueous acidic liquor from heretofore precipitated depolymerized polymers, andallocating said supplementary solvent heretofore employed for extraction to precipitate additional depolymerized polymers, anddissolving the heretofore extracted precipitated depolymerized polymers, retaining solvent from the previous extraction, with an extractate containing water from a subsequent water extraction, to produce a mixture of water insoluble solids, and a liquefied mixture of dissolved depolymerized polymers, solvent and water and,dividing said liquefied mixture from water insoluble solids and,extracting, by counter flow, said water insoluble solids with water to substantially extract any residual solvent and heretofore dissolved depolymerized polymers to form an extractate containing water, solvent, and heretofore dissolved depolymerized polymers and to form water insoluble solids substantially free of solvent and heretofore dissolved depolymerized polymers and, allocating said extractate containing water, solvent, and heretofore dissolved depolymerized polymers for dissolving additional depolymerized polymers, andmeans for separating said solvent from said liquid containing aqueous acidic liquor to provide an aqueous acidic liquor substantially devoid of solvent, andmeans for separating said solvent from said liquefied mixture of dissolved depolymerized polymers to provide a liquefied mixture substantially devoid of solvent whereby dissolved depolymerized polymers substantially free of solvent is produced and furthermore the aqueous acidic liquor is substantially free of solvent and recovered for recycling to produce additional depolymerized polymers from cellulose and hemicellulose accompanying the cellulose and furthermore the solventis recycled and additionally water insoluble solids substantially free of solvent and dissolved depolymerized polymers are produced.
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이 특허에 인용된 특허 (4)
Brelsford Donald L. (8655 Bridger Canyon Rd. Bozeman MT 59715), Bei hydrolysis process system an improved process for the continuous hydrolysis saccharification of ligno-cellulosics in.
Clausen Edgar C. (2425 Sharon St. Fayetteville AR 72701) Gaddy James L. (964 Arlington Ter. Fayetteville AR 72701), Concentrated sulfuric acid process for converting lignocellulosic materials to sugars.
Gaddy James L. (964 Arlington Ter. Fayetteville AR 72701) Clausen Edgar C. (2425 Sharon St. Fayetteville AR 72701), Method of separation of sugars and concentrated sulfuric acid.
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