Sugar – starch – and carbohydrates – Processes – Carbohydrate manufacture and refining
Patent
1993-01-04
1994-08-16
Lieberman, Paul
Sugar, starch, and carbohydrates
Processes
Carbohydrate manufacture and refining
127 1, 127 44, 162 14, 162 23, C13D 114, D21B 112
Patent
active
053383664
ABSTRACT:
Biomass, such as bagasse, is pre-hydrolyzed, to ultimately effect hydrolysis of hemicellulose to sugars. Biomass is mixed with a mineral acid solution to form a slurry having a consistency of about 8 to 12% so that the acid solution properly wets the biomass. Then the slurry is dewatered to about 35 to 50% consistency, and is heated to reaction temperature (e. g. about 320.degree. F.) by direct contact with steam in the vapor phase of a vertical pressurized reactor, having a pressure of about 40 psig. A fluffer is preferably provided in the top of the reaction vessel. After a reaction time of about 30 minutes, the biomass is diluted and cold blown out of the bottom of the reactor. Pressate from the dewatering has acid added to it and is heated by indirect heat exchange with a sugar solution obtained by washing of the biomass discharged from the reactor, and is then mixed with the biomass as the acid solution.
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Lambert et al, "Economic Evaluation of TVA's Dilute Acid Process . . . Hardwoods", Tennessee Valley Authority, Mar. 1989.
Barrett Mark D.
Bilodeau Vic L.
Grace Todd S.
Greenwood Brian F.
McCarty Gary L.
Hailey Patricia L.
Kamyr Inc.
Lieberman Paul
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