Hydrolysis of cellulose in supercritical water: reagent concentration as a selectivity factor

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• 作者：Celia M. Martínez ; Danilo A. Cantero ; M. D. Bermejo ; M. J. Cocero
• 关键词：Biomass ; Glycolaldehyde ; Kinetics ; Sugars ; Supercritical fluids
• 刊名：Cellulose
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：22
• 期：4
• 页码：2231-2243
• 全文大小：880 KB
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• 作者单位：Celia M. Martínez (1)
  Danilo A. Cantero (1) (2)
  M. D. Bermejo (1)
  M. J. Cocero (1)
  
  1. High Pressure Processes Group, Department of Chemical Engineering and Environmental Technology, University of Valladolid, C/Dr Mergelina s/n, 47011, Valladolid, Spain
  2. Department of Applied and Industrial Chemistry, Faculty of Exact, Physical and Natural Sciences, National University of Cordoba, Av. Vélez Sarsfield 1611, 5000, Córdoba, Argentina
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Bioorganic Chemistry
  Physical Chemistry
  Organic Chemistry
  Polymer Sciences
  
• 出版者：Springer Netherlands
• ISSN：1572-882X

文摘

In this work, the influence of reagent concentration on hydrolysis reactions of cellulose in supercritical water was analyzed. The hydrolysis was carried out at 400?°C and 25?MPa with reaction times between 0.07 and 1.57?s and feeding cellulose concentrations between 5 and 20?%?w/w (1.5-?%?w/w at reactor inlet). Also, a flash separator was used to separate vapor in the product stream in order to increase the final concentration. The best result for sugar production (79?%?w/w) was obtained working with a cellulose concentration of 5?%?w/w and 0.07-s reaction time. For glycolaldehyde production, the best result (42?%?w/w) was obtained with a concentration of 20?%?w/w and 1.57?s. The employment of a flash separator allowed reducing the water content by 50?%. It was also observed that by increasing the cellulose concentration in the reactor up to 4?%?w/w, the hydrolysis took place with a similar kinetic as that in the heterogeneous media, thus reducing the conversion rate of cellulose in supercritical water.