Hydrogenation of pitch from low-temperature carbonization of coal

Technical Report · Fri Dec 01 04:00:00 EDT 1944

OSTI ID:7320692

Ibing, G

Earlier experiments had showed that cokery pitch, the pitch obtained from high-temperature carbonization of coal, was superior to coal itself as beginning material for hydrogenation processes. The experiments reported here were conducted to determine if the same processes used for cokery pitch could be used for the pitch obtained from low-temperature-carbonization of coal. It turned out that after a few major problems were solved, this latter type of pitch could be successfully processed, and would yield more desirable products even than cokery pitch. Experiments were carried out in both the liquid phase, using a finely-ground catalyst in the reaction mixture, and in the vapor phase, using a solid catalyst fixed in the oven, with 450/sup 0/C and 700 atm gauge pressure used in both phases. In the liquid phase, the major problems were the stopping up of preheaters by iron deposits formed by high-temperature breakdown of nonfilterable metal-organic impurities in the pitch and uncontrolled temperature variations in the ovens caused by build-up of catalyst which was not carried out of the ovens by the gaseous products formed there. Both these problems could be solved by mixing 40 to 50 percent cokery pitch with 60 to 50 percent of the other pitch before starting the process, and the results were still better than from cokery pitch alone. The vapor phase experiments were successful only after a method was developed for removing all solid and metal-organic impurities from the pitch, and after it was decided to use different preheaters at different temperatures for the pitch and for hydrogen gas, so that mixing the two in the ovens would give the correct reaction temperature.

• Research Organization: Ruhroel, G.m.b.H., Bottrop (Germany)
• OSTI ID: 7320692
• Report Number(s): TOM-7-820-862
• Country of Publication: United States
• Language: German

Related Subjects

01 COAL, LIGNITE, AND PEAT
010403* -- Coal & Coal Products-- Hydrogenation-- (-1987)
010405 -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
AROMATICS
CARBONIZATION
CATALYSTS
CHEMICAL REACTIONS
COAL LIQUEFACTION
DECOMPOSITION
DIAGRAMS
ELEMENTS
FUELS
GASOLINE
HEATERS
HIGH PRESSURE
HIGH TEMPERATURE
HYDROGENATION
INFORMATION
INTERFERING ELEMENTS
IRON
LIQUEFACTION
METALS
ORGANIC COMPOUNDS
ORGANOMETALLIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
PETROLEUM PRODUCTS
PITCHES
PRECIPITATION
SEPARATION PROCESSES
TABLES
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENTS