木质包装废弃物快速热解过程中的氮迁移机制

发布时间：2018-10-23 15:34

【摘要】：目的考察原料氮在木质包装材料中的分配规律。方法在固定床反应器装置上进行快速热解实验,研究胶黏剂、实木木材和刨花板在不同温度下的热解产物分布和气相产物成分分布;在热裂解气相色谱质谱联用系统上研究氮在各相产物之间,以及液相产物各组分之间的分布情况。结果原料中氮的含量和热解温度是影响氮在各相产物中分配的主要因素,且温度越高,热解气相氮产量上升,炭氮和焦油氮的含量降低;热解过程中,刨花板中氮通过自身裂解和木材组分发生交互反应生成小分子和杂环氮结构,杂环氮结构在高温下会继续裂解生成小分子,同时也会聚合生成多杂环氮结构。结论温度和施胶量是影响氮化合物成分分布的2个最主要因素。废弃刨花板中的氮来源于脲醛树脂和木材。在原料氮的裂解和聚合反应方面有2条迁移路径,一条路径会通过裂解产生氨气和炭氮,另一条路径会生成可挥发的杂环氮。
[Abstract]:Objective to investigate the distribution of nitrogen in wood packaging materials. Methods Rapid pyrolysis experiments were carried out in a fixed bed reactor to study the distribution of pyrolysis products and gas phase components of adhesives, wood and particleboard at different temperatures. The distribution of nitrogen among phases and components in liquid phase was studied by pyrolysis gas chromatography-mass spectrometry (Pyrolysis gas chromatography-mass spectrometry). Results the nitrogen content and pyrolysis temperature in raw materials were the main factors affecting the distribution of nitrogen in various phase products, and the higher the temperature, the higher the gas nitrogen production and the lower the content of carbon nitrogen and tar nitrogen in pyrolysis process. Nitrogen in particleboard can form small molecule and heterocyclic nitrogen structure through self-cracking and wood component interaction reaction. Heterocyclic nitrogen structure will continue to break down to form small molecule at high temperature and also polymerize to form polyheterocyclic nitrogen structure. Conclusion temperature and sizing amount are the two most important factors affecting the distribution of nitrogen compounds. Nitrogen in waste particleboard comes from UF resin and wood. There are two transport pathways for the cracking and polymerization of nitrogen from feedstock. One pathway will produce ammonia and carbon nitrogen by cracking and the other path will produce volatile heterocyclic nitrogen.
【作者单位】：北京林业大学;
【分类号】：TB484.2;TK6

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