Abstract
SRC was co-carbonized with hydropyrene (CHP) using a tube bomb under pressurized nitrogen gas (5kg/cm2G) to prepare needle-like coke. Although the carbonization of SRC made mosaic coke under atmospheric as well as pressurized nitrogen gas, the co-carbonization at 500 °C for 3hr with a mixing ratio of 40 to 60 wt% CHP enhanced the development of anisotropic texture and increased the size of optical texture. Co-carbonization of CHP with SRC enabled us to increase significantly the coke yield of CHP.
The carbonization of CHP under pressure yeilded a pitch-like materials, which contained needle-like crystals in the major isotropic matrix. The chemical constituents in the pitch derived from hydropyrene were analyzed by means of solvent extraction, gel-permeation chromatography and field desorption mass spectroscopy to reveal the chemical changes during co-carbonization.
The increase of the coke yield from CHP is ascribed to the some dehydrogenative condensation of CHP, into trimers and tetramers of pyrene units by SRC constituents. Their roles in the co-carbonization are discussed from views of the carbonization reactivity and physical properties.
