In-situ fiber optic FTIR spectroscopy for coal liquefaction processes

Michael A. Serio, Hsisheng Teng, Kim S. Knight, Stephen C. Bates, Stuart Farquharson, Anthony S. Bonanno, Peter R. Solomon, William A. Stevenson, Mark A. Druy, Paul J. Glatkowski, James A. Harrington, Rick K. Nubling, Jack Y. Ding, Alfred G. Comolli

Research output: Contribution to journalConference articlepeer-review

5 Citations (Scopus)


The development of diagnostic instrumentation for monitoring coal liquefaction process streams is discussed. A sapphire optical fiber was used as an attenuated total reflectance (ATR) element in conjunction with Fourier transform infrared (FT-IR) spectrometry to probe harsh liquefaction process streams. ATR provides a short, reproducible pathlength which allows for the analysis of highly absorbing materials, such as liquid hydrocarbons, and the properties of sapphire are well suited for the analysis of high temperature and high pressure process streams. A test cell was constructed which allowed in-situ monitoring of coal liquefaction reactions at 400 degree(s)C and 3000 psig. The cell incorporated a sapphire optical fiber as an ATR sensing element which was coupled to an FT-IR spectrometer using zirconium fluoride fiber optic cables. The spectra provide qualitative information about the liquefaction process.

Original languageEnglish
Pages (from-to)121-131
Number of pages11
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 1993 Dec 31
EventOptical Methods for Chemical Process Control 1993 - Boston, United States
Duration: 1993 Sep 71993 Sep 10

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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