High-Pressure Measuring Cell for Raman Spectroscopic Studies of Natural Gas

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Abstract:

A system for obtaining Raman spectra of gases at high pressure has been constructed. In order to ensure that a natural gas sample is totally representative, a high-pressure gas-measuring cell has been developed, built up by stainless steel fittings and a sapphire tube. The design and construction of this cell are described. A perfect pressure seal has been demonstrated up to 15.0 MPaA (MPa absolute). The cell has been successfully used to obtain Raman spectra of natural gas samples. Some of these spectra are presented and assigned. The most remarkable observation in the spectra is that it is possible to detect hydrogen sulfide at concentrations of 1-3 mg H2S/Nm3. An attempt to make a quantitative analysis of natural gas by the so-called "ratio method" is presented. In addition to this, the relative normalized differential Raman scattering cross sections for ethane and i-butane molecules at 8.0 MPaA and 10.2 MPaA have been determined.

Keywords: CELL; HIGH-PRESSURE; NATURAL; RAMAN; SPECTROSCOPY

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702011951434

Affiliations: 1: Department of Chemistry and Engineering Research Center, IVC-SEP, Department of Chemical Engineering, Technical University of Denmark, DK-2800 Lyngby, Denmark 2: Department of Chemistry, Technical University of Denmark, DK-2800 Lyngby, Denmark 3: Engineering Research Center, IVC-SEP, Department of Chemical Engineering, Technical University of Denmark, DK-2800 Lyngby, Denmark

Publication date: January 1, 2001

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