摘要
为了解决甲醇羰基化反应尾气中微量碘的测定问题,通过实验比较了几种常用的碘测定方法,同时考虑了取样方法及乙醇吸收剂对测定方法的影响。实验结果表明,采用乙醇吸收法采样会对常用的分光光度计检测方法造成干扰,在乙醇存在下溴氧化、次氯酸氧化及砷铈氧化分光光度法都无法准确定量微量碘。另外,吸收采样方法难以完全吸收气体中的碘。采用吸附采样可以完全吸附碘甲烷,但随后的定量程序也显繁琐。GC-MS或GC-ECD方法应该作为甲醇羰基化反应尾气中微量碘测定的首选方法。
To determine the content of CH3I in off-gas, commonly used methods for iodine measurement were tested. Experimental results show that all the methods fail due to the existence of ethanol. Moreover, ethanol may not absorb CH3I in off-gas completely, which results sampling error. Adsorption of CH3I onto sorbents can be an alternative sampling method, but desorption and determination of CH3I subsequently will be tedious. GC-MS and GC-ECD are recommended as best choice.
出处
《化学工程师》
CAS
2015年第11期19-21,共3页
Chemical Engineer
关键词
碘甲烷
测定
吸收
吸附
methyl Iodide
determination
absorption
adsorption
