Purity control of caprolactam by head-space gas-liquid chromatography

Николов, Р.Н.; Pishev, D. I.; Stefanova, Ana

doi:10.1016/s0021-9673(01)81587-9

Cited by 3 publications

(2 citation statements)

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“…Because of the great variety and low concentration of impurities in caprolactam, the existence of large amount of caprolactam matrix usually interferes the determination of these impurities 9. SPME could, to some extent, overcome this shortcoming because of its particular characteristics.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, it is the critical issue to determine the impurities in caprolactam and thereby to understand their influence on the products. Lots of analytical work has been done on the impurities of caprolactam, such as Raman spectroscopy,6 gas chromatography (GC),4, 7–9 high performance liquid chromatography (HPLC)10 and gas chromatography–mass spectrometry (GC–MS),11 etc. However almost all of work was focused on analyzing impurities in caprolactam produced from cyclohexanone.…”

Section: Introductionmentioning

confidence: 99%

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Determination of impurities in industrial caprolactam produced from toluene by SPME and GC–MS

Li¹,

Zou²

2006

J of Applied Polymer Sci

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Solid-phase microextraction (SPME) in combination with gas chromatography-mass spectrometry (GC-MS) was applied to study the impurities in industrial caprolactam produced from toluene. Various nitriles, lactones, amides, and alcohols were detected to be the main impurities in caprolactam products. Trace amounts of heterocyclic compounds, which had great effects on the quality of caprolactam, were also successfully detected. Those were pyrrole, 2-ethyl-3-methyl pyrazine, 5,6,7,8-tetrahydroquinoxaline, quinoxaline, 2,3-dimethyl quinoxaline, 2-pyridinamide, etc. The effects of some impurities on caprolactam quality and the polymerization of caprolactam as well as the possible origin of the main impurities were also discussed. This could be of great importance to the industrial purity control of caprolactam.

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Section: Resultsmentioning

confidence: 99%