| 摘要 |
A pitch suitable for carbon artifact production (i) contains from 80 to 100 percent by weight of toluene insolubles, (ii) has been derived from a deasphaltenated middle fraction of a feedstock, and (iii) is substantially free of impurities and ash, and/or has less than 15 wt % of quinoline insolubles. Suitably the deasphaltenated fraction is rich in 4, 5 and 6 polycondensed aromatic ring compounds, and/or is from a cat cracker bottom. Preferably the pitch is prepared by heat soaking a said deasphaltenated middle fraction and subsequently removing oils therefrom by sub-atmospheric pressure stripping. |
