Towards the interaction between calcium carbide and water during gas-chromatographic determination of trace moisture in ultra-high purity ammonia

被引：17

作者：

Trubyanov, Maxim M. ^{[1
]}

Mochalov, Georgy M. ^{[1
]}

Suvorov, Sergey S. ^{[2
]}

Puzanov, Egor S. ^{[1
]}

Petukhov, Anton N. ^{[1
]}

Vorotyntsev, Ilya V. ^{[1
]}

Vorotyntsev, Vladimir M. ^{[1
]}

机构：

[1] Nizhnii Novgorod State Tech Univ, Nanotechnol & Biotechnol Dept, Lab Membrane & Catalyt Proc, 24 Minina Str, Nizhnii Novgorod 603950, Russia

[2] Firm HORST Ltd, 14-2-257 Akad Yangelya Str, Moscow 117534, Russia

来源：

JOURNAL OF CHROMATOGRAPHY A | 2018年 / 1560卷

关键词：

Ammonia; Trace water; Calcium carbide; Gas chromatography; FTIR spectrometry; Reaction kinetics; CARBON-MONOXIDE; PURE AMMONIA; VAPOR-PHASE; IMPURITIES; NITROGEN; DIOXIDE; CO2; SPECTROSCOPY; TRIFLUORIDE; COLUMNS;

D O I：

10.1016/j.chroma.2018.05.028

中图分类号：

Q5 [生物化学];

学科分类号：

071010 ; 081704 ;

摘要：

The current study focuses on the processes involved during the flow conversion of water into acetylene in a calcium carbide reaction cell for the trace moisture analysis of ammonia by reaction gas chromatography. The factors negatively affecting the reproducibility and the accuracy of the measurements are suggested and discussed. The intramolecular reaction of the HO-Ca-C (math)CH intermediate was found to be a side reaction producing background acetylene during the contact of wet ammonia gas with calcium carbide. The presence of the HO-Ca-C (math)CH intermediate among the reaction products is confirmed by an FTIR spectral study of calcium carbide powder exposed to wet gas. The side reaction kinetics is evaluated experimentally and its influence on the results of the gas chromatographic measurements is discussed in relation to the determination of the optimal operating parameters for ammonia analysis. The reaction gas chromatography method for the trace moisture measurements in an ammonia matrix was experimentally compared to an FTIR long-path length gas cell technique to evaluate the accuracy limitations and the resource intensity. (C) 2018 Elsevier B.V. All rights reserved.

引用

页码：71 / 77

页数：7

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