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PEI溶液紫外吸收光谱检测油气田硫化氢气体
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作者单位
唐东林,张琪,柯志军,王瞧 西南石油大学机电工程学院石油天然气装备教育部重点实验室 
基金项目:国家自然科学基金资助项目(41474142)
中文摘要:建立了一种基于聚乙烯亚胺(PEI)溶液的紫外(UV)吸收光谱检测油气田硫化氢(H2S)气体浓度的方法。利用PEI结构中的氨基可与H2S气体反应的特性,测定通入H2S气体前后PEI溶液的UV吸收光谱,并分析了UV光谱吸收峰在230、365 nm附近的吸光度变化与气体浓度的关系。采用标准浓度的H2S气体样品进行浓度标定实验,建立了H2S气体浓度与吸光度之间的关系模型。实验结果表明:通入高纯度H2S气体时,PEI溶液的UV光谱在230 nm和365 nm处均出现较强吸收峰;通入较低浓度H2S气体时,UV光谱只在230 nm处出现吸收峰,该吸收峰附近的吸光度与H2S气体浓度间存在线性关系(相关系数为0.970 6),系统对H2S气体浓度的检出限可达15.39 mg/m3。基于PEI溶液的UV吸收光谱检测法可为油气田H2S气体浓度的快速、准确测定提供参考。
中文关键词:聚乙烯亚胺  紫外吸收光谱  硫化氢气体  有机聚合物  精确测量
 
Detection of H2S Gas in Oil and Gas Fields by Ultraviolet Absorption Spectroscopy with PEI Solution
Abstract:A method based on UV absorption spectroscopy with polyethylenimine(PEI) solution was proposed for the rapid and accurate detection of H2S gas in oil and gas fields.The amino groups in PEI reacted with H2S gas while it was bubbled into PEI solution,which could be utilized in the detection of H2S concentration.The UV absorption spectra of PEI solution were measured before and after bubbling H2S gas,and the absorbance near absorption line 230 nm and 365 nm of UV absorption spectra was analyzed.H2S gas samples with standard concentration were prepared for concentration calibration tests,and the relationship between gas concentration and UV absorbance was studied.The experimental results showed that a good linear relationship between H2S gas concentration and UV absorbance of PEI solution was obtained,with a correlation coefficient(r2) of 0.970 6.Meanwhile,the limit of detection for H2S gas reached to 15.39 mg/m3.UV absorbance analysis on PEI solution could be used for the rapid determination of H2S gas in oil and gas fields.
Key Words:polyethylenimine  ultraviolet absorption spectrum  hydrogen sulfide  organic polymer  accurate measurement
引用本文:唐东林,张琪,柯志军,王瞧.PEI溶液紫外吸收光谱检测油气田硫化氢气体[J].分析测试学报,2018,37(6):749-753.
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