Dissolution of coal in solvents

Thesis/Dissertation · Fri Jan 01 00:00:00 EST 1982

OSTI ID:5601717

Ebnesajjad, S

Experimental studies were effected in a 1-liter batch reactor to determine the role of the solvent and temperature on the dissolution of a Kentucky No. 9 coal. The goal was to increase the dissolution yield, defined as conversion of coal to pyridine-soluble material, while decreasing the hydrogen demand. The experiments were carried out in the absence of hydrogen gas. The solvent and coal were heated at a constant rate of temperature rise to 300 to 400/sup 0/C and held at a constant temperature for periods of 0 to 50 minutes before rapidly quenching the reaction mixture. 2-Methylnaphalene, 1,2,3,4-tetrahydronaphthalene (tetralin), p-cresol or ..beta..-naphthol, and ..gamma..-picoline were used in different ratios as the solvent. These compounds represented, respectively, the polycondensed aromatics, hydroaromatics (hydrogen donor), monophenols, and basic nitrogen compounds found in coal liquefaction recycle solvents. Dissolution yield of the coal reached a maximum in a solvent containing equal parts of 2-methylnaphthalene and tetralin. The H/C ratio of the preasphaltenes remained virtually constant when the tetralin content ranged from 20 to 65 wt % in mixtures with 2-methylnaphthalene. A slight increase was noted when pure tetralin was the solvent. Addition of small amounts of ..beta..-naphthol and ..gamma..-picoline to a 1:4 weight ratio of tetralin and 2-methylnaphthalene improved the dissolution yield. Coal was dissolved with no or minor chemical reactions up to the temperature of approx. 340/sup 0/C in a solvent containing 46.1 wt % tetralin, 46.1 wt % 2-methylnaphthalene, 4.9 wt % ..beta..-naphthol, and 2.9 wt % ..gamma..-picoline. Beyond this temperature dissolution yield increased exponentially typical of thermal cracking reactions.

• OSTI ID: 5601717
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
COAL
DISSOLUTION
COAL LIQUIDS
THERMAL CRACKING
CRESOLS
SOLVENT PROPERTIES
HYDROGEN
CONSUMPTION RATES
NAPHTHALENE
NAPHTHOLS
PICOLINES
TETRALIN
COAL LIQUEFACTION
HIGH TEMPERATURE
SOLVENT-REFINED COAL
TEMPERATURE EFFECTS
AROMATICS
AZINES
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
CONDENSED AROMATICS
CRACKING
DECOMPOSITION
ELEMENTS
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUELS
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
HYDROXY COMPOUNDS
LIQUEFACTION
LIQUIDS
MATERIALS
NONMETALS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHENOLS
PYRIDINES
PYROLYSIS
THERMOCHEMICAL PROCESSES
010405* - Coal
Lignite
& Peat- Hydrogenation & Liquefaction