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Office of Scientific and Technical Information
 

Modified coal-tar pitch

Patent ·
OSTI ID:5361280
;
A coal-tar pitch material is described which is obtained by the process which consists in mixing an undistilled coaltar material with a solvent which consists of at least one of the following n-methyl-2-pyrollidone and the fraction of a coal-tar distillate which boils between 100/sup 0/ and 350/sup 0/C. The mixing is carried out at a temperature such as to form a solvent-dissolved fraction and a solvent-undissolved fraction, separating and removing the solvent-undissolved fraction of the undistilled coal-tar material, the undissolved fraction containing Q.I. having a high content of ash-forming impurities and using the solvent-dissolved fraction to produce coal-tar material with a decreased Q.I. and lower impurities by distilling the solvent-dissolved fraction of the undistilled coal-tar material to obtain from the solvent-dissolved product a pitch material having a toluene insoluble content of over 20%, a beta resin content of over 15%, a quinoline insoluble content of less than 5% and ash content of less than 0.1%.
Assignee:
Domtar, Inc., Montreal
Patent Number(s):
US 4604184
OSTI ID:
5361280
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)
010500 -- Coal
Lignite
& Peat-- Products & By-Products
ALKYLATED AROMATICS
AROMATICS
ASH CONTENT
AZAARENES
AZINES
BOILING POINTS
CHEMICAL PREPARATION
COAL TAR
COAL TAR OILS
DISSOLUTION
DISTILLATES
DISTILLATION
EXTRACTION
HETEROCYCLIC COMPOUNDS
HIGH TEMPERATURE
HYDROCARBONS
IMPURITIES
MEDIUM TEMPERATURE
MIXING
OILS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC POLYMERS
OTHER ORGANIC COMPOUNDS
PETROCHEMICALS
PETROLEUM PRODUCTS
PHYSICAL PROPERTIES
PITCHES
POLYMERS
PYRIDINES
QUANTITY RATIO
QUINOLINES
RESINS
SEPARATION PROCESSES
SOLVENT EXTRACTION
SOLVENTS
SYNTHESIS
TAR
THERMODYNAMIC PROPERTIES
TOLUENE
TRANSITION TEMPERATURE