| 木质素持续发展 |
| 添加时间：2018/7/12 16:59:36 浏览次数： |
| 木质素持续发展 Continuous development of lignin 随着人类对环境污染和资源危机等问题的认识不断深入，天然高分子所具有的可再生、可降解等性质日益受到重视。 With the deepening of human understanding of environmental pollution and resource crisis, natural polymers have been paid more and more attention to the properties of renewable and degradable. Kim JW 等研究了煤与造纸黑液的共液化，他们认为木质素的热解形成苯氧自由基，以及其它反应性自由基在低温下对于煤基有很重要的热解作用。这些自由基是高效的活性中间体，能够使得煤中的亚甲基断裂从而促进煤的解聚。 The co liquefaction of coal and paper black liquor has been studied by Kim JW and so on. They think that the pyrolysis of lignin forms Benzoxy radicals, and other reactive radicals have an important pyrolysis effect on the coal base at low temperature. These radicals are highly efficient active intermediates that enable methylene cracking in coal to facilitate the depolymerization of coal. Akash BA 等研究了煤与木质素共液化动力学。采用伊利诺斯州烟煤与腐蚀性的木质素混合物，反应在初始氢压 1.1 MPa、375℃、四氢萘作溶剂下完成的。煤和木质素混合物液化产品与单独用煤液化得到的产物相比，含较少苯不溶物。排阻色谱研究表明，煤和木质素混合物液化产品平均分子量比用单煤或单木质素液化得到的产品的分子量要低。试验数据表明，在加入木质素后煤的转化率提高了22%，通过研究分析得到了描述化学反应的数学模型。他们对液体产品循环的影响也进行了研究。初步试验表明，随着产品循环的增加，煤总的分解率是减小的。 The kinetics of CO liquefaction of coal and lignin was studied by Akash BA et al. The mixture of Illinois bituminous coal and corrosive lignin was used to react at the initial hydrogen pressure of 1.1 MPa, 375 C and four naphthalene as solvent. The liquefaction product of coal and lignin mixture contains less benzene insoluble matter compared with the product obtained by liquefaction of coal alone. Exclusion chromatography studies show that the average molecular weight of liquefied products of coal and lignin mixtures is lower than that of products obtained by liquefaction of coal or lignin. The experimental data showed that the conversion rate of coal increased by 22% after adding lignin, and a mathematical model describing chemical reaction was obtained through research and analysis. Their impact on the circulation of liquid products has also been studied. Preliminary tests show that the total decomposition rate of coal decreases with the increase of product cycle. 以上的研究表明，当煤与木质素共液化时，煤的液化温度可降低。而且不同研究者得到的实验结果都表明，与煤单独液化相比，煤与生物质共液化所得到的液化产品质量得到改善，液相产物中低分子量的戊烷可溶物有了增加。产生这些结果的原因可能是木质素的热解形成苯氧自由基，以及其它反应性自由基在低温下对于煤基有很重要的热解作用。当使用含有苯酚类基团的溶剂进行液化时，煤的转化率也有显著增加，虽然国内外对生物质与煤的共液化取得了一定的进展，但还有许多不够深入，以后应着力研究煤与木质素共液化工艺条件，改性生物质与煤液化试验研究、木质素与煤共液化动力学、木质素与煤催化剂的专用高效催化剂方面的研究。 The above research shows that when coal and lignin are liquefied, the liquefaction temperature of coal can be reduced. The results obtained by different researchers all show that the quality of liquefied products obtained from coal and biomass co liquefaction is improved, and the low molecular weight of pentane soluble products in liquid products have increased. These results may be caused by the pyrolysis of lignin to form Benzoxy radicals, and other reactive radicals have an important pyrolysis effect on the coal base at low temperature. When a solvent containing phenol group is used to liquefy the coal, the conversion rate of coal is also increased significantly. Although some progress has been made in the process of CO liquefaction of biomass and coal at home and abroad, there are still a lot of lack of depth. The process of CO liquefaction of coal and lignin should be studied, and the experimental research on the modified biomass and coal liquefaction should be studied. Research on lignin and coal liquefaction kinetics, lignin and coal catalysts. |
| 上一页 聚酯纤维与沥青的复合材料 |
| 下一页 木质素纤维技术作用 |
Copyright © 技术支持：遨游网络