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| Study on Separation of Moso Bamboo Branch Components by Ethanol-water Extraction Method |
| Received:May 09, 2020 |
| DOI：10.11980/j.issn.0254-508X.2020.08.006 |
| Key Words:moso bamboo branch ethanol-water lignin oligoxylose pulp |
| Fund Project:兴辽英才计划特聘教授项目（XLYC1802025）。 |
| Author Name | Affiliation | Postcode | | ZHU Zengke | College of Light Industry & Chemical Engineering, Dalian Polytechnic University, Dalian, Liaoning Province, 116034 | 116034 | | PING Qingwei | College of Light Industry & Chemical Engineering, Dalian Polytechnic University, Dalian, Liaoning Province, 116034 | 116034 | | ZHANG Jian | College of Light Industry & Chemical Engineering, Dalian Polytechnic University, Dalian, Liaoning Province, 116034 | 116034 | | SHENG Xueru | College of Light Industry & Chemical Engineering, Dalian Polytechnic University, Dalian, Liaoning Province, 116034 | 116034 | | LI Na | College of Light Industry & Chemical Engineering, Dalian Polytechnic University, Dalian, Liaoning Province, 116034 | 116034 | | SHI Haiqiang | College of Light Industry & Chemical Engineering, Dalian Polytechnic University, Dalian, Liaoning Province, 116034 | 116034 |
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| Abstract:Intermittent three-stage ethanol-water extraction was carried out using discarded Moso bamboo branch as raw materials. Lignin, solvent, and polysaccharide were recovered from the extraction solution of each stage. The effects of extraction temperature on the yields and properties of the main product polysaccharide, the by-products lignin and pulp were investigated. The results showed that this component separation method was feasible. When the extraction temperatures were respectively kept at 170℃ for 2.5 h for the first stage, at 145℃ for 1.0 h for the second stage and at 120℃ for 0.5 h for the third stage, the liquid ratio of each stage of 1∶10 and the ethanol volume fraction of each stage of 65%, the total yield of raw sugar containing a small amount of impurities was 25.12%,which was slightly higher than the raw material pentose content of 24.86%; the total yield of refined sugar was 22.26%, of which oligoxylose (DP2-DP7) accounted for 59.09%; the lignin obtained by extraction accounted for 48.04% of the total lignin in the raw materials; screened pulp yield was 49.59%.Ion chromatography and pulp fiber morphology and resultant paper performance analyses showed that the increase of the first stage extraction temperature in the range of 170 ℃ to 180 ℃ had little effect on the yields of raw sugar, refined sugar and lignin, but would lead to a decrease of the oligosaccharide’ s yield, the pulp’ s yield and paper strength; the pulp obtained by the separation of components with ethanol-water method had high content of non-fibrous cells and low paper strength, and it could be mixed with high-quality pulp to make paper after screening. |
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