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气体混合物中氧、氩、氮的分析在气体制取、催化、高分子合成、冶金和原子能等工业以及许多科研工作中是十分重要的。目前,这些气体的分析几乎无例外地采用气相色谱法。以分子筛类吸附剂(5A或13X)或高分子固定相(如Porapak Q)为分离柱;为了解决氧和氩这个难分离物质对的分离问题,须采用低柱温,如-70℃。其缺点是消耗大量致冷剂并使控温装置复杂化,灵敏度差。有人用增加柱长和在真空或高温下活化分子筛以降低对氩的吸附使氧和氩在常温下得以分离。但前者使分析时间拖长,灵敏度降低;后者使分子筛对水和二氧化碳
Analysis of oxygen, argon and nitrogen in gas mixtures is very important in many industries, such as gas production, catalysis, polymer synthesis, metallurgy and atomic energy, as well as many scientific research projects. At present, the gas analysis is almost without exception using gas chromatography. A molecular sieve adsorbent (5A or 13X) or a polymeric stationary phase (such as Porapak Q) is used as the separation column; a low column temperature, such as -70 ° C, is required to resolve the separation of oxygen and argon, which are difficult to separate. The disadvantage is that a large amount of refrigerant is consumed and the temperature control device is complicated and the sensitivity is poor. Some people use to increase the column length and activated under vacuum or high temperature molecular sieves to reduce the adsorption of argon to oxygen and argon at room temperature to be separated. However, the former prolonged the analysis time and decreased the sensitivity. The latter caused the molecular sieve to separate water and carbon dioxide