Effects of process severity on physiochemical properties of preasphaltenes
This paper describes the physical character and reactions of preasphaltenes made from a bituminous coal. The preasphaltenes were obtained by reacting Illinois No. 6 Burning Star coal in contact with SRC-II heavy distillate under hydrogen pressure in an Autoclave for various times (10 to 30 minutes) and temperatures (350 to 450/sup 0/C). The preasphaltenes were separated by using conventional Soxhlet extraction techniques. The primary question addressed was: Are preashaltenes produced under one set of reaction severities (i.e., 350/sup 0/C for 10 minutes) different than those made at other severities (i.e., 400 or 450/sup 0/C). The extracted preasphaltenes were analyzed for molecular weight, solubility and elemental composition. The chemical reactivities (upgradeability) were studied by further reaction of the extracted preasphaltenes with SRC-II heavy distillate solvent in shaking microreactors at 400/sup 0/C under hydrogen for 0 to 30 minutes. The conversion of the preasphaltenes was followed using a gel permeation liquid chromatographic analytical method. The results indicated that preasphaltenes generated at lower severity were more soluble, more reactive and had a higher molecular weight than those generated at higher severity.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 5320080
- Report Number(s):
- SAND-82-0486C; CONF-820909-1; ON: DE82009989
- Country of Publication:
- United States
- Language:
- English
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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301 -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ACTIVATION ENERGY
ASPHALTENES
ASPHALTS
BITUMENS
BITUMINOUS COAL
BLACK COAL
CARBON
CARBONACEOUS MATERIALS
CHEMICAL COMPOSITION
CHROMATOGRAPHY
COAL
COAL LIQUEFACTION
COAL LIQUIDS
DATA
ELEMENTS
ENERGY
ENERGY SOURCES
EXPERIMENTAL DATA
EXTRACTION
FLUIDS
FOSSIL FUELS
FUELS
HIGH TEMPERATURE
HYDROGEN
INFORMATION
LIQUEFACTION
LIQUIDS
MATERIALS
MOLECULAR WEIGHT
NITROGEN
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXYGEN
REACTION INTERMEDIATES
SEPARATION PROCESSES
SOLUBILITY
SOLVENT EXTRACTION
SOLVENT-REFINED COAL
SRC-II PROCESS
SULFUR
TAR
TEMPERATURE EFFECTS
THERMOCHEMICAL PROCESSES
TIME DEPENDENCE