Nitration of polynuclear aromatic hydrocarbons in coal combustors and exhaust streams

Technical Report · Mon Feb 01 00:00:00 EST 1993

DOI:https://doi.org/10.2172/6648102· OSTI ID:6648102

Yu, L; Dadamio, J; Hildemann, L; Niska, S

Our efforts this quarter were directed at preparing PAH samples at well-controlled extents of primary devolatilization. In the long (12.5 cm) hot zone, Preliminary studies with a Pit. No. 8 hvA bituminous coal showed that a furnace temperature of 1380 K yields the best resolution of primary devolatilization from secondary pyrolysis. There is no soot at all in the PAH samples collected during the first half of tar evolution. Although some soot is present in the total sample of all tar from primary devolatilization it never amounts to more than 10 % of the aerosol and is usually less than 5 %. Also, the maximum weight loss observed with the new operating conditions is nearly 50 wt. % daf, which compares favorably to our previous value of 55 wt. % for this coal. Regarding PAH analysis during this quarter, the assembly of the gravity-flow column chromatographic system for prefractionating the coal tar was completed. Standard compounds spanning a wide range of polarities and molecular weights were selected and purchased. These compounds were utilized to begin testing and refining the prefractionation procedure.

• Research Organization: Stanford Univ., CA (United States). Dept. of Civil Engineering
• Sponsoring Organization: USDOE; USDOE, Washington, DC (United States)
• DOE Contract Number: FG22-91PC91284
• OSTI ID: 6648102
• Report Number(s): DOE/PC/91284-T2; ON: DE93012278
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
COAL
COMBUSTION
DEVOLATILIZATION
PYROLYSIS
POLYCYCLIC AROMATIC HYDROCARBONS
CHEMICAL PREPARATION
NITRATION
CHEMICAL ANALYSIS
COAL TAR
FRACTIONATION
LIQUID COLUMN CHROMATOGRAPHY
PROGRESS REPORT
AROMATICS
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
CHROMATOGRAPHY
DECOMPOSITION
DOCUMENT TYPES
ENERGY SOURCES
FOSSIL FUELS
FUELS
HYDROCARBONS
MATERIALS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXIDATION
SEPARATION PROCESSES
SYNTHESIS
TAR
THERMOCHEMICAL PROCESSES
014000* - Coal
Lignite
& Peat- Combustion
400201 - Chemical & Physicochemical Properties