A COMPARISON OF COAL TAR AND PETROLEUM PITCH

摘要

The first coal chemical recovery ovens were installed in the United States in 1893. By 1915, byproduct ovens accounted for 97 percent of the metallurgical coke produced in the United States. Since the building of by-product ovens, coal tar pitch has been the binder of choice for the aluminum, commercial carbon, and graphite industries. Man has used another abundant raw material, petroleum, for centuries. The oil industry as we know it today began with the discovery of crude oil in Ontario and Western Pennsylvania in the 1850's. The complex facilities constructed to process crude oil have largely concentrated on producing transportation and heating fuels as their liquid products with little attention paid to petroleum derived binder materials. However, during the 1960's some refiners began to show an interest in producing petroleum derived pitches. These efforts resulted in the development of petroleum pitches that had reasonably high aromaticities and specific gravities.