Thermodynamics of gas phase chromium species: The chromium chlorides, oxychlorides, fluorides, oxyfluorides, hydroxides, oxyhydroxides, mixed oxyfluorochlorohydroxides, and volatility calculations in waste incineration processes

Journal Article · Mon May 01 04:00:00 EDT 1995 · Combustion and Flame

DOI:https://doi.org/10.1016/0010-2180(94)00215-E· OSTI ID:63269

Ebbinghaus, B B ^[1]

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1. Lawrence Livermore National Lab., CA (United States)

The thermodynamics of 12 gaseous chromium chlorides and oxychlorides and 12 gaseous chromium fluorides and oxyfluorides are assessed for application to chromium volatility calculations in thermal oxidation processes such as waste incineration. A method is also proposed for estimating the thermodynamics for mixed chromium oxyfluorochlorohydroxide species which contain varying proportions of oxygen, fluorine, chlorine, and hydroxide. Thermodynamic functions and thermodynamic constants for the gaseous chromium chlorides, oxychlorides, fluorides, and oxyfluorides are evaluated by the molecular constant method using molecular parameters taken from the literature or estimated from known constants for related vapor species. The enthalpies of formation of the gaseous chromium chlorides, oxychlorides, fluorides, and oxyfluorides are assessed based on available data in the literature. In some cases, only minimum values of the standard formation enthalpies can be established. A general assessment of the volatility of chromium in waste incineration processes at temperatures ranging from 800 to 1,600 K yields CrO{sub 2}Cl{sub 2}(g) as the dominant oxychloride and CrO{sub 2}F{sub 2}(g) as the dominant oxyfluoride species except at higher temperatures where CrO{sub 2} Cl(g) and CrOCl{sub 2}(g) are important and where CrO{sub 2} F(g) and CrOF(g) dominate.

• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 63269
• Journal Information: Combustion and Flame, Journal Name: Combustion and Flame Journal Issue: 3 Vol. 101; ISSN CBFMAO; ISSN 0010-2180
• Country of Publication: United States
• Language: English

Related Subjects

09 BIOMASS FUELS
36 MATERIALS SCIENCE
CHROMIUM CHLORIDES
CHROMIUM COMPOUNDS
CHROMIUM FLUORIDES
COMBUSTION KINETICS
COMPILED DATA
FORMATION HEAT
HYDROXIDES
INCINERATORS
OXYCHLORIDES
OXYFLUORIDES
SOLID WASTES
THERMODYNAMIC PROPERTIES
VOLATILE MATTER