Loading...
Please wait, while we are loading the content...
Similar Documents
Application of cryogenic spectroscopy to the determination of impurity concentration in coal gasifiers
| Content Provider | United States Department of Energy Office of Scientific and Technical Information (OSTI.GOV) |
|---|---|
| Author | Holland, R. F. Quigley, G. P. |
| Organization | Los Alamos National Lab., NM (USA) |
| Abstract | A number of small molecules are soluble at low-to-moderate concentrations in the ir-transparent liquefied rare gases. As part of an effort to develop methods to measure concentrations of minor constituents in product gases from coal gasifiers, we have measured the infrared spectral absorbance of solutions produced by sampling cryogenically a mixture of gases and dissolving the sample in liquid xenon. Observations thus far include CO/sub 2/, CO, CH/sub 4/, and H/sub 2/ as major constituents and NO/sub 2/, NO, NH/sub 3/, N/sub 2/O, SO/sub 2/, and COS as minor constituents in the mixture. For low concentrations in the cold solutions, solute absorption bands are narrow, with widths at half-maximum absorbance of 1 to 10 cm/sup -1/ compared with approx. 30 to 100 cm/sup -1/ for the gas phase. The band-narrowing enhances peak absorbance and reduces spectral overlapping for easier analysis of complex mixtures. In the sampling, we remove most CO and CH/sub 4/, so that only the CO/sub 2/ interferes with the spectrum of minor constituents. In the spectra we can distinguish bands of N/sub 2/O, SO/sub 2/, COS, and NO/sub 2/ (as N/sub 2/O/sub 4/) and estimate concentrations. The sensitivity and accuracy of the cryogenic solution technique for gas analysis are not yet established; however, detection of approx. 10 ppM appears possible with a half-inch absorption cell. |
| Related Links | https://www.osti.gov/biblio/6456430 |
| Page Count | 18 |
| File Format | |
| Language | English |
| Publisher Date | 1981-01-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | PHYSICAL AND ANALYTICAL CHEMISTRY INORGANIC ORGANIC COAL LIGNITE PEAT AMMONIA ABSORPTION SPECTROSCOPY CARBON DIOXIDE CHEMICAL ANALYSIS CARBON MONOXIDE CARBON OXYSULFIDE COAL GAS HYDROGEN METHANE NITRIC OXIDE NITROGEN DIOXIDE NITROUS OXIDE SULFUR DIOXIDE COAL GASIFICATION IMPURITIES INFRARED SPECTRA LIQUIDS LOW TEMPERATURE MIXTURES QUALITATIVE CHEMICAL ANALYSIS SOLUTIONS XENON ALKANES CARBON COMPOUNDS CARBON OXIDES CHALCOGENIDES DISPERSIONS ELEMENTS FLUIDS GASES GASIFICATION HYDRIDES HYDROCARBONS HYDROGEN COMPOUNDS NITROGEN COMPOUNDS NITROGEN HYDRIDES NITROGEN OXIDES NONMETALS ORGANIC COMPOUNDS OXIDES OXYGEN COMPOUNDS RARE GASES SPECTRA SPECTROSCOPY SULFUR COMPOUNDS SULFUR OXIDES THERMOCHEMICAL PROCESSES Spectral Procedures (-1987) Coal Lignite Peat Properties & Composition Peat Gasification |
| Content Type | Text |
| Resource Type | Article |
