Search for optimum conditions of wheat straw hemicelluloses cold alkaline extraction process |
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| Institution: | 2. Campus of International Excellence Agrifood (CeiA3), Spain;3. Group of Biotechnology and the Environment, Area of Materials, Management of Technological Innovation, ACCIONA Infraestructuras S.A, Spain;1. College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing 210009, China;2. National Engineering Technique Research Center for Biotechnology, Nanjing, China;3. Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing, China;1. Co-Innovation Center for Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China;2. Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control, Nanning 530004, China;3. College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China;4. Materials Science & Engineering College, Nanjing Forestry University, Nanjing 210037, China;1. Chemical Engineering Department, Amman, 11942, Jordan;2. Mechanical Engineering Department, School of Engineering, The University of Jordan, Amman, 11942, Jordan;1. State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China;2. Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China;3. Guangdong Engineering Research Center for Green Fine Chemicals, Guangzhou 510640, China;1. State Key Laboratory of Pulp and Paper Engineering, Plant Micro/Nano Fiber Research Center, School of Light Industry and Engineering, South China University of Technology, Guangzhou 510640, China;2. Guangdong Key Laboratory for Innovative Development and Utilization of Forest Plant Germplasm, State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, South China Agricultural University, Guangzhou 510642, China;3. Beijing Key Laboratory of Lignocellulosic Chemistry, College of Materials Science and Technology, Beijing Forestry University, Beijing 100083, China;1. Department of Food Engineering and Technology, São Paulo State University, Avda. Cristóvão Colombo, 2265, 15054-000, São José do Rio Preto, Brazil;2. Biofuels Unit, Energy Department-CIEMAT, Avda. Complutense, 40, 28040, Madrid, Spain |
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| Abstract: | A method for the selective extraction of hemicellulose from wheat straw involving cold alkaline extraction and subsequent separation by precipitation with ethanol is proposed. Wheat straw affords selective separation of the hemicellulose fraction from the cellulose and lignin fractions with the proposed method. The hemicellulose yield was optimized by using a 2n factor design to examine the influence of temperatures (temperature was designed between 20 and 40 °C), operation times (operation time was designed between 30 and 60 min) and alkali concentrations (alkali concentration was designed between 80 and 120 g L−1). These conditions allowed 56.1% of all hemicellulose initially present in the raw material, and 59.1% of the lignin, to be extracted. Subsequent separation of hemicellulose in the liquid phase from the cold alkaline extraction by precipitation with ethanol provided a fraction containing 39.4% of all hemicellulose (45.2% hemicellulose in extract/total extract) and only 12% of all lignin in the raw material. |
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