High coking value pitch
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United States of America Patent
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Mar 5, 2002
Grant Date -
N/A
app pub date -
Dec 20, 1999
filing date -
Dec 31, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A high coking value pitch with a relatively low softening point is disclosed. A pitch is distilled or thermally processed to produce an intermediate pitch with an increased coking value and relatively high softening point, then blended with a cutter solvent of a liquid hydrocarbon stream to form a product pitch. The process may be used to increase the coking value of either petroleum or coal tar pitch. Preferably the cutter solvent is methylnaphthalene, or a highly aromatic, low viscosity oil or similar aromatic rich stream having a substantially lower boiling point than the intermediate pitch product.
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