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Applied Spectroscopy

Applied Spectroscopy


  • Vol. 54, Iss. 3 — Mar. 1, 2000
  • pp: 406–412

Fast On-Line Analysis of Process Alkane Gas Mixtures by NIR Spectroscopy

Hans F. M. Boelens, Wim Th. Kok, Onno E. De Noord, and Age K. Smilde

Applied Spectroscopy, Vol. 54, Issue 3, pp. 406-412 (2000)

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Proper operation of a molecular sieve process for the separation of iso- and cyclo-alkanes from normal alkanes requires the fast online detection of normal alkanes breaking through the column. The feasibility of using near-infrared (NIR) spectroscopy for this application was investigated. Alkane mixtures were prepared according to an experim ental design. These mixtures, containing small amounts of normal alkanes (C5-C7) and varying amounts of isoand cyclo-alkanes (seven compounds), were analyzed simultaneously at 160C with the use of NIR spectroscopy and gas chromatography as a reference method. With an analysis time of 9s, a critical level of 0.4% [mole/mole] of normal alkanes could be achieved. If a faster response is required, the analysis time can be reduced to 4s, at the cost, however, of an increase in the critical level to about 1% [mole/mole]. Index Headings: On-line NIR spectroscopy; Calibration; Quantitative analysis; Normal alkanes; Critical level.

Hans F. M. Boelens, Wim Th. Kok, Onno E. De Noord, and Age K. Smilde, "Fast On-Line Analysis of Process Alkane Gas Mixtures by NIR Spectroscopy," Appl. Spectrosc. 54, 406-412 (2000)

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