On the possibility of lowering the amount of 3,4 benzophyrene in coal-tar pitches

Journal Article · Sun Jan 01 04:00:00 EST 1984 · Coke Chem. USSR (Engl. Transl.); (United States)

OSTI ID:5302438

Sukhorukova, E A; Kharlampovich, G D; Kuz'minykh, A I; Markova, N V; Ponomarev, A V; Slyshkina, T V

The by-products from treating coal-tar pitch - especially those containing 3,4 benzophyrene (BP) - constitute a source of environmental contamination in the coking industry. A considerable amount of BP is continually formed in the process of the thermal reduction of bituminous coal, and it accumulates in the resinous products; the amount of it depends on the composition of the coals being coked, the coking temperature and the conditions under which the volatile substances leave the pyrolysis zone. Investigation of the kinetics of BP formation during thermal and oxidizing treatment of pitches - as well as when obtaining pitches during distillation - has indicated that lowering its heating temperature to 355/sup 0/C, and lowering the pitch-treatment temperature to 250-300/sup 0/C, makes it possible to slow down the BP formation reaction. Lowering the BP content in the pitches is made possible by oxidizing them using air at the heating temperatures recommended. The degree of BP conversion increase when adding ozone to the air in small amounts. The BP content in the end products can amount to 0.25-0.28% by mass, which is 10-15 times less than in pitches produced using the usual technology.

• Research Organization: Ural Polytechnical Institute
• OSTI ID: 5302438
• Journal Information: Coke Chem. USSR (Engl. Transl.); (United States), Journal Name: Coke Chem. USSR (Engl. Transl.); (United States) Vol. 7; ISSN COKCA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010401* -- Coal & Coal Products-- Carbonization-- (-1987)
AIR
AIR POLLUTION ABATEMENT
AROMATICS
BENZOPYRENE
BITUMINOUS COAL
BLACK COAL
CARBONACEOUS MATERIALS
CARBONIZATION
CHEMICAL REACTIONS
COAL
COAL TAR
COKING
COKING PLANTS
CONDENSED AROMATICS
DECOMPOSITION
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUELS
GASES
HEAT TREATMENTS
HIGH TEMPERATURE
HYDROCARBONS
INDUSTRIAL PLANTS
MATERIALS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXIDATION
OZONE
PITCHES
POLLUTION ABATEMENT
PYROLYSIS
SYNTHESIS
TAR
TEMPERATURE DEPENDENCE
TEMPERATURE EFFECTS
THERMOCHEMICAL PROCESSES