核磁共振测量甲醇汽油中甲醇含量的实验研究
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摘要
为探索低场核磁共振测量甲醇汽油中甲醇含量的方法,用无水甲醇和93#汽油配制了不同甲醇浓度的甲醇汽油混合溶液和含MnCl_2·4H_2O甲醇汽油实验样品,采用核磁共振CPMG自旋回波法测量了T2谱,分析了横向弛豫时间和峰面积随甲醇浓度的变化关系。实验结果表明:甲醇汽油溶液中加入MnCl_2·4H_2O后,随甲醇浓度的增加,横向弛豫时间和峰面积的变化幅度显著增大,进而提出了基于核磁共振T2谱测量甲醇汽油中甲醇含量的新方法;验证实验证明了该方法的可行性和有效性。
In order to investigate the low field nuclear magnetic resonance(NMR) method for measuring methanol content of methanol-gasoline,methanol gasoline samples with and without MnCl_2·4H_2O were respectively prepared using anhydrous methanol and 93-octane gasoline,and NMR T2 spectra of the samples were measured in Carr-Purcell-Meiboom-Gill(CPMG) spin-echo sequence.The transverse relaxation time and peak area of T2 spectra changed greatly with the increase of methanol content after adding MnCl_2·4H_2O into methanol-gasoline,which indicated that innovative method has been found to measure the methanol content of methanol-gasoline,and the validity and reliability of this method has been verified by the experiments.
In order to investigate the low field nuclear magnetic resonance(NMR) method for measuring methanol content of methanol-gasoline,methanol gasoline samples with and without MnCl_2·4H_2O were respectively prepared using anhydrous methanol and 93-octane gasoline,and NMR T2 spectra of the samples were measured in Carr-Purcell-Meiboom-Gill(CPMG) spin-echo sequence.The transverse relaxation time and peak area of T2 spectra changed greatly with the increase of methanol content after adding MnCl_2·4H_2O into methanol-gasoline,which indicated that innovative method has been found to measure the methanol content of methanol-gasoline,and the validity and reliability of this method has been verified by the experiments.
引文
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[2]梁玮.甲醇汽油的研究开发及应用现状[J].中外能源,2006,11(02):95-100.
[3]王翔,郭拥军,张建军.甲醇、汽油及甲醇汽油作内燃机燃料的性质比较[J].化工时刊,2005,19(3):46-49.
[4]周瑞,黄风林,倪炳华.甲醇汽油的稳定性能研究[J].西安文理学院学报,2008,11(1):64-67.
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[6]李雁如.中红外光谱法测定甲醇汽油中甲醇含量[J].山西化工,2014(04):38-39.
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[11]张嘉伟,赛芳,宋公仆.核磁共振测井常用发射序列研究[J].技术研究,2015,10:137-139.
[12]赵子剑,王进喜,聂斌,等.液体T2弛豫时间测量CPMG磁共振脉冲序列实现与应用[J].生物医学,2017,7(4):73-78.
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[14]王殿生,周丽霞,刘超卓,等.物理实验教程--近代物理实验[M].青岛:中国石油大学出版社,2016.