Low solids content, coal tar based impregnating pitch
A method is described of obtaining a coal tar based impregnant pitch characterized by having a sulfur content of less than 0.5 weight percent and a quinoline insoluble, QI, content of less than about 0.5 percent and enhanced impregnation property. This method comprises: selecting coal tar oil feedstock having: (1) a distillation residue at 355/sup 0/C > 30 weight percent; and (2) a QI < 0.5 weight percent; heating the feedstock to a temperature of between about 150/sup 0/C and 390/sup 0/C; and oxidizing and stripping the feedstock until: an ASTM D-3104-77 softening point between about 90/sup 0/C and 150/sup 0/C; a coking value of at least 45 weight percent according to ASTM D-2416-73; and a flashpoint of at least 200/sup 0/C according to ASTM D92-72 are obtained.
- Assignee:
- Allied Corporation, Morris Township, Morris County, NJ
- Patent Number(s):
- US 4664774
- OSTI ID:
- 6439873
- Resource Relation:
- Patent File Date: Filed date 20 Feb 1985
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COAL TAR
CHEMICAL PREPARATION
COKING
COMBUSTION PROPERTIES
DISTILLATION
HIGH TEMPERATURE
IMPREGNATION
MEDIUM TEMPERATURE
MELTING POINTS
OXIDATION
PITCHES
QUANTITY RATIO
QUINOLINES
RESIDUES
SULFUR CONTENT
AROMATICS
AZAARENES
AZINES
CARBONIZATION
CHEMICAL REACTIONS
DECOMPOSITION
HETEROCYCLIC COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OTHER ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
PYRIDINES
SEPARATION PROCESSES
SYNTHESIS
TAR
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
010500* - Coal
Lignite
& Peat- Products & By-Products