Coal tar and petroleum pitches as binders for prebaked electrodes

Conference · Thu Jan 01 04:00:00 EST 1976 · Am. Chem. Soc., Div. Fuel Chem., Prepr.; (United States)

OSTI ID:7342152

King, L F; Robertson, W D

Incorporation of a rubber reinforcing carbon black in a catalytically cracked petroleum residuum gave a binder similar to coal tar pitch for prebaked carbon electrode manufacture. At the optimum binder content of 23 wt percent, a cracked pitch containing 5 percent SRF black had the same effective coking value as coal tar pitch and produced test electrodes of equivalent density, compressive strength and electrical resistivity. Petroleum binders containing only 2.5 wt percent carbon black had somewhat inferior properties. Commonly accepted laboratory coking tests such as the 2.5 hr isothermal test at 550/sup 0/C and thermal gravimetric analysis (TGA) with programmed heating to 650/sup 0/C for 10 hr did not correlate with the results of baking test electrodes. A modified TGA procedure which involved heating the binder to 800/sup 0/C over a period of 154 hr gave much better correlation with practice, particularly in the case of coal tar pitch, and a cracked petroleum pitch containing the optimum amount of carbon black (5 percent). This result confirms previous observations that at long residence times, condensation and polymerization reactions are favored over cracking and/or volatilization. The presence of a high proportion of distillable coke-forming components in a cracked petroleum pitch, as noted earlier by vacuum distillation analysis, was corroborated.

• Research Organization: Imperial Oil Enterprises Ltd., Sarnia, Ont.
• OSTI ID: 7342152
• Conference Information: Journal Name: Am. Chem. Soc., Div. Fuel Chem., Prepr.; (United States) Journal Volume: 18:4
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010500* -- Coal
Lignite
& Peat-- Products & By-Products
02 PETROLEUM
020500 -- Petroleum-- Products & By-Products
BINDERS
CARBON
CARBON BLACK
CATALYSIS
CHEMICAL REACTIONS
COAL TAR
CRACKING
DECOMPOSITION
ELECTRODES
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
NONMETALS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
PETROLEUM
PITCHES
PYROLYSIS
TAR