高含硫天然气脱硫用MDEA溶液中盐杂质的鉴定

天然气净化厂MDEA脱硫溶液发泡现象频繁发生，严重影响装置平稳运行。盐杂质是引起MDEA溶液发泡的主要原因，有必要对盐杂质进行全分析。本文建立了一种MDEA脱硫溶液中盐类杂质的分析方法，溶液中的阴离子和非金属阳离子分别采用不同色谱条件的离子色谱仪进行测定，金属阳离子则通过采用N2O-C2H2火焰吸收的原子吸收分光光度计进行分析。脱硫溶液中盐杂质的全面分析，可为准确分析MDEA脱硫溶液发泡影响因素以及采取控制措施提供理论依据。

Determination of Salt Impurities in MDEA Solution Used in Desulfurization of Highly Sulphurous Natural Gas

The foaming phenomenon of N-methyldiethanolamine(MDEA) solution used in desulfurization process occurs frequently in the natural-gas purification plant. The foaming phenomenon has a strong impact on operation of the process unit. The salt impurities are the main reason for causing the foaming of MDEA solution, so the full analysis of salt impurities is necessary. A method for comprehensive analysis of salt impurities in MDEA solution used in desulfurization process was established. Anions and non-metallic cations of MDEA solution were determined by different conditions of ion chromatograph, respectively. Metallic cations of the solution were detected by atomic absorption spectrophotometer with the N2O-C2H2 flame absorption. The analytical results of salt impurities in the desulfurization solution can provide a theoretical basis for an accurate analysis of the factors affecting the foaming of MDEA to unveil further control measures.