文章摘要
酶解秸秆残渣中木质素的提取、表征和应用
Extraction, Characterization and Application of Lignin from Fermentation Residue
投稿时间:2019-06-05  修订日期:2019-09-02
DOI:
中文关键词: 生物质  木质素  碱性乙醇  表征  聚氨酯薄膜
英文关键词: biomass  lignin  alkaline-ethanol  characterization  polyurethane film
基金项目:
作者单位E-mail
白毓黎 中石化大连石油化工研究院 baiyuli.fshy@sinopec.com 
张通 中石化大连石油化工研究院 zhangtong.fshy@sinopec.com 
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中文摘要:
      采用碱性乙醇法从酶解玉米秸秆残渣原料中提取木质素,考察了乙醇浓度、温度、固液比和碱浓度对木质素提取率的影响;对提取的木质素进行了FTIR、13C NMR及1H NMR等表征,并探索了木质素部分替代聚己内酯二醇用于聚氨酯薄膜的合成及降解性能研究。研究发现,在50%乙醇浓度、200℃、m(固)∶m(液)=1∶20和0.5% NaOH浓度条件下,提取产物中木质素含量为94.1%,木质素提取率达到93.5%;产物的羟基含量为66.5 mg KOH/g,当用其添加27%质量分数的聚己内酯二醇制备聚氨酯薄膜时,薄膜的拉伸强度为24.0 MPa,断裂伸长率为224%,降解率为3.3%;进一步,添加适量葡萄糖提高聚氨酯薄膜的降解性能和耐水性能,降低薄膜透气性,葡萄糖添加量为3%时薄膜60天内的降解率能达到11%。
英文摘要:
      To utilize the fermentation residue of corn straw, the lignin component was extracted by using alkaline-ethanol method. Effects of ethanol concentration, temperature, residue/solvent ratio and alkaline amount on lignin yield were studied. The obtained lignin was characterized by fourier transform infrared spectroscopy (FTIR), carbon-13 nuclear magnetic resonance (13C NMR) and proton nuclear magnetic resonance (1H NMR) spectroscopy. Results showed that the extraction yield of lignin could reach 93.5% and the content of lignin was up to 94.1% under the condition (temperature was 200℃, ethanol concentration was 50%, m(residue)∶m(solvent)=1:20 and NaOH concentration was 0.5wt.%). In addition, hydroxyl content of the obtained lignin product was 66.5 mg KOH/g. For the preparation of lignin-based polyurethane film, the tensile strength and the elongation at break were 24.0MPa and 224% respectively, and the degradation ratio was 3.3% when the ratio of substitution of polycaprolactone by lignin was 27%. Furthermore, the appropriate addition of glucose into the lignin-based polyurethane film can increase the biodegradation rate and water resistance of the film, reduce membrane permeability and the degradation ratio of the film with 3% glucose adding was 11.0% in 60 days.
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