Process for modifying coal-tar materials
Patent
·
OSTI ID:6463979
The present invention relates to a process for decreasing and modifying the quinoline-insoluble content (Q.I.) of coal-tar materials; and comprises extracting the coal-tar material with a solvent, where the solvent contains at least one of n-methyl-2-pyrrolidone and the wash oil fraction of coal-tar distillate. Pitches with a diminished Q.I. content, lower viscosity and lower average Q.I. particle size, may be prepared from coal-tar materials which have been so treated.
- Assignee:
- Domtar Inc., Canada
- Patent Number(s):
- US 4517072
- OSTI ID:
- 6463979
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
01 COAL, LIGNITE, AND PEAT
010407* -- Coal & Coal Products-- Solvent Extraction-- (-1987)
AROMATICS
AZAARENES
AZINES
CHEMICAL PREPARATION
COAL TAR
EXTRACTION
HETEROCYCLIC COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OTHER ORGANIC COMPOUNDS
PITCHES
PROCESSING
PYRIDINES
QUINOLINES
SEPARATION PROCESSES
SOLVENT EXTRACTION
SYNTHESIS
TAR
010407* -- Coal & Coal Products-- Solvent Extraction-- (-1987)
AROMATICS
AZAARENES
AZINES
CHEMICAL PREPARATION
COAL TAR
EXTRACTION
HETEROCYCLIC COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OTHER ORGANIC COMPOUNDS
PITCHES
PROCESSING
PYRIDINES
QUINOLINES
SEPARATION PROCESSES
SOLVENT EXTRACTION
SYNTHESIS
TAR