Two-stage acid hydrolysis of soyresidue to produce glucose and xylose
| Autor: | Ying-Hui Huang, 黃盈惠 |
|---|---|
| Rok vydání: | 2010 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 98 Each year, Asian nations and the United States generate more than 13 million tons of soy residue from productions of tofu and soymilk. Soy residue contains 50-55% cellulose and 15-20% of fats that can be converted into biofuels, but the majority of soy residue was sent to landfills and composting facilities. This work was to explore the possibility of using a two-stage acid hydrolysis to convert soy residue into reducing sugars and to study the effects of acid concentration, reaction temperature and time on the conversion. In each stage of acid hydrolysis, a central composite design method was used for the selection of experimental conditions and a multivariate regression analysis was applied to fit the data into quadratic polynomial. Experimental results showed that each gram of soy residue could produce 478 milligrams of reducing sugars including 222 mg of xylose and 79 mg of gluclose. in the first stage of acid hydrolysis, the optimal sugar yield was 403 mg/g, when the acid concentration, temperature and reaction time were 6%, 120℃, and 90 minutes, respectively. Only 30% of solid soy residue was unreacted. In the second stage, the optimal sugar yield was 252 mg/g, when the acid concentration, reaction temperature and time were 16%, 150 ℃, and 60 minutes, respectively. This work demonstrated that soy residue could be used as a raw material for the production of glucose and xylose, which could be fermented into alcohols. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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