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| Separation of Acid and Sugar in the Waste Liquid from Acid Hydrolysis for Preparing Cellulose Nanocrystals |
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| DOI：10.11981/j.issn.1000-6842.2017.03.27 |
| Key Words:CNC; waste liquor from acid hydrolysis; anion exchange membrane; glucose; sulfuric acid |
| Fund Project:天津市制浆造纸重点实验室(天津科技大学)开放基金(NO.201313)。 |
| Author Name | Affiliation | | 王 帅 | 天津市制浆造纸重点实验室，天津科技大学造纸学院，天津，300457 | | 刘鹏涛* | 天津市制浆造纸重点实验室，天津科技大学造纸学院，天津，300457 | | 侯佳玲 | 天津市制浆造纸重点实验室，天津科技大学造纸学院，天津，300457 |
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| Abstract: |
| There were lots of sulfuric acid, some of not fully hydrolyzed cellulose fragments, monomer sugars and oligo in the waste liquid from preparing cellulose nanocrystals (CNC) by sulfuric acid hydrolysis process. If the waste liquid was discarded directly without recycling, and it could cause environmental pollution and a great waste of resource. This paper studied the method for recovering both sulfuric acid and glucose. The concentration of sulfuric acid in the waste liquid was adjusted by adding 80%(wt) sulfuric acid, then the materials not fully hydrolyzed were converted to glucose by heating in water bath. The sulfuric acid and glucose were separated by anion exchange membrane, then concentrated by using rotary evaporating and concentrating system. Results showed that glucose concentration in the waste liquid reached maximum when sulfuric acid concentration was 56%(wt) and heating at 45℃ for 3 h in water bath. The recovery rate of sulfuric acid was 90.31% after the liquid was treated twice by anion exchange membrane, 10.06 mol/L sulfuric acid and 36 g/L glucose solution were obtained after being concentrated. |
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