Process for de-ashing coal tar
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United States of America Patent
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Jul 9, 1996
Issued Date -
N/A
app pub date -
Mar 21, 1994
filing date -
May 28, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Described are novel processes for treating high-ash coal tars to produce coal tars which are suitable for distillation to form binder pitch. Preferred processes of the invention involve multi-stage centrifugations to reduce ash and preferably also quinoline insoluble levels. Processes of the invention also provide for the treatment of coal tar sludges to recover valuable coal tar distillate and dried, free-flowing coal related material having high fuel value.
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