The fate of sulfur in mild gasification liquids

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This investigation addresses the determination of sulfur distribution in mild gasification liquids produced from untreated coal and from modified in two ways to reduce sulfur in the products: (a) physical mixing with a sulfur scavenger (CaO), and (b) pretreatment with aqueous alkali followed by mixing with CaO. Coal pyrolysis in the presence of CaO has previously been investigated, (3,5) showing that CaO can be effective in reducing the sulfur content of the fuel gas, and possibly that of the product liquids. Pretreatment of coals with alkaline chemicals has also been studied,(6,7) showing reduced sulfur and other changes in the liquid ... continued below

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Pages: (5 p)

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Knight, R.A.; Koncar, G.J. & Babu, S.P. January 1, 1991.

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  • Institute of Gas Technology
    Publisher Info: Institute of Gas Technology, Chicago, IL (United States)
    Place of Publication: Chicago, Illinois

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Description

This investigation addresses the determination of sulfur distribution in mild gasification liquids produced from untreated coal and from modified in two ways to reduce sulfur in the products: (a) physical mixing with a sulfur scavenger (CaO), and (b) pretreatment with aqueous alkali followed by mixing with CaO. Coal pyrolysis in the presence of CaO has previously been investigated, (3,5) showing that CaO can be effective in reducing the sulfur content of the fuel gas, and possibly that of the product liquids. Pretreatment of coals with alkaline chemicals has also been studied,(6,7) showing reduced sulfur and other changes in the liquid products.(8) Data on sulfur distribution in the liquid products could be useful for understanding the chemistry of alkali pretreatment and CaO interaction with coal sulfur during pyrolysis. In this work, a pyrolysis-gas chromatography (Py-GC) technique that simulates mild gasification on a milligram scale was used in conjunction with a carbon-specific flame ionization detector (FID) and a sulfur-specific flame photometric detector (FPD) to determine the sulfur distribution in oils/tars from Illinois No. 6 coal. A low-resolution packed GC column was employed to resolve oils/tars by carbon number, with ranges selected to approximate distillation fractions which might be recovered from a commercial mild gasification process. Oils/tars up to C{sub 18} were also collected from the pyro-probe effluent into dichloromethane for off-line study using a high-resolution GC with atomic emission detector (GC/AED) and with GC-mass spectrometry (GC/MS) to measure specific sulfur compounds. 9 refs., 1 tab.

Physical Description

Pages: (5 p)

Notes

OSTI; Institute of Gas Technology, 3424 State Street, Chicago, IL 60616

Source

  • 1991 international conference on coal science, Newcastle upon Tyne (United Kingdom), 16-20 Sep 1991

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  • Other: TI92002499
  • Report No.: CONF-910902-9
  • Grant Number: None
  • Office of Scientific & Technical Information Report Number: 6224871
  • Archival Resource Key: ark:/67531/metadc1113606

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Creation Date

  • January 1, 1991

Added to The UNT Digital Library

  • Feb. 22, 2018, 7:45 p.m.

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  • Nov. 20, 2018, 1:16 p.m.

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Knight, R.A.; Koncar, G.J. & Babu, S.P. The fate of sulfur in mild gasification liquids, article, January 1, 1991; Chicago, Illinois. (digital.library.unt.edu/ark:/67531/metadc1113606/: accessed December 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.