本文研究了哈龙替代型灭火剂五氟乙烷高温热分解规律以及分解产物的毒性，实验所得大量一手数据和分析结果将为五氟乙烷灭火剂的工程应用规范和标准修改提供坚实的理论依据。针对五氟乙烷的反应特性，搭建了一套由带恒温控制的高温卡夫炉、精密控制流量的进气装置、耐高温和耐腐蚀的气体反应器、尾气收集和环保处理装置等组成的实验装置。过程中设置了不同的反应温度和停留时间。运用气相色谱（GC）、离子选择色谱（IEC）、气相色谱质谱联用（GC/MS）等手段检测并分析了五氟乙烷高温热分解产物的组成和变化规律。
实验表明，五氟乙烷受热发生了分解，相较于反应停留时间，温度是决定分解的关键因素。600℃和650℃时，五氟乙烷基本未发生分解，750℃时，有较明显分解发生，反应随着温度的升高而加剧，随着停留时间的增加而加剧。经分析五氟乙烷高温中主要发生了脱HF反应，生成四氟乙烯，并同时发现在实验管中残留一定量积碳。反应生成的HF含量很低，剩余原料气五氟乙烷在设计灭火浓度内对人无毒害作用，另外，作为产物中含量最高的751氟丙烯属于低毒类，因此，当五氟乙烷在高温热分解后将不会有较大毒性。5147
关键词 五氟乙烷 热分解 哈龙替代灭火剂 毒性
毕业论文设计说明书（论文）外文摘要
Title The thermal decomposition of pentafluoroethane and analysis on the toxicity of products
Abstract
This paper describes a research on the thermal decomposition of pentafluoroethane, a substitute of Halons extinguisher and analysis of the products toxicity. Based on this research, the group got numerous first-hand data of pentafluoroethane’s thermal decomposition which will provide a solid theoretical foundation for the application of pentafluoroethane extinguisher and development of relevant standard. We set up a series of experimental devices: constant temperature stove, reaction tube, gas collection and environmental protection devices. GC, ion exchange chromatography (IEC) and GC/MS are analysis equipment. The temperature and residence time are the main two factors we are researching.
Experiment shows that compared with the residence time, reaction temperature makes more contribution to the decomposition. As the temperature increases, the reaction exacerbates. The same discipline happens to the residence time. After analyzing the products of decomposition, we deem that reaction starts at 650℃. During the decomposition, pentafluoroethane strips of HF, and generates tetrafluoroethylene. Cause the low density of HF and low toxicity of Hexafluoropropylene, the main products of decomposition are not so harmful to people in the designed range.
Keywords pentafluoroethane, thermal decomposition, toxicity, Halons substitute extinguisher
目 次
1 绪论 1
1.1哈龙灭火剂背景 1
1.1.1哈龙灭火剂简介 1
1.1.2 哈龙灭火剂所引发的环境问题 1
1.1.3 哈龙灭火剂替代物的研究 2
1.2 五氟乙烷灭火剂综述 3
1.2.1五氟乙烷简介 3
1.2.2 五氟乙烷热稳定性研究现状 3
1.3 本文的主要工作 5
2 实验准备与步骤 6
2.1实验方案 6
2.2装置与药品 7
2.2.1实验装置 7
2.2.2分析设备 8
2.2.3实验药品 9
2.3实验准备 10
2.3.1反应器恒温区的确定 10 五氟乙烷灭火剂高温热分解与产物气体的毒性:http://www.751com.cn/huaxue/lunwen_2087.html