Flash hydropyrolysis of coal. Quarterly report No. 3, July 1, 1977--September 30, 1977
The program is designed to study the process variables and chemistry of the Flash Hydropyrolysis Process, a rapid gas-phase, non-catalytic coal hydrogenation technique developed at BNL. The equipment used is a 1 lb/hr unit utilizing a 1 inch down flow tubular reactor designed to operate at up to 4000 psi and 800/sup 0/C. This equipment has been in operation for more than a year with only one problem. All the data to date on product yield as a function of temperature and hydrogen pressure is correlated in 4 tables and plotted in a series of 9 figures. The total liquid yields appear to reach a maximum of approximately 20% at 750/sup 0/C with only slight increase with hydrogen pressures above 2000 psi. Approximaly half of this yield is BTX. The ethane yield also appears to maximize between 700 and 750/sup 0/C but continues to increase with increased pressure. Methane yields are shown to continue to increase with both temperature and hydrogen pressure. Total carbon conversion under these conditions approximated 60%. The pyrolysis of lignite using helium in the system shows a five to ten fold decrease in the yields of CH/sub 4/, C/sub 2/H/sub 6/ and C/sub 6/H/sub 6/ compared to flash hydropyrolysis under hydrogen pressure. Preliminary experiments were conducted at 750 and 800/sup 0/C to determine the effect of coal particle residence time on product yields and distribution. The results indicate that at 750/sup 0/C both liquid and gaseous yields increase from 45% to 52% as the residence time is increased by a factor of four from 2.3 to 9.2 seconds. However, at 800/sup 0/C under similar conditions, little change in total yield (60%) is observed but the liquid yield decreases from approximately 4% to 1% with a corresponding increase in gaseous products.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- DOE Contract Number:
- EY-76-C-02-0016
- OSTI ID:
- 6725420
- Report Number(s):
- BNL-50779
- Country of Publication:
- United States
- Language:
- English
Similar Records
Flash hydropyrolysis of lignite and sub-bituminous coals to both liquid and gaseous hydrocarbon products
Flash hydropyrolysis of coal. Quarterly report No. 4, October 1--December 31, 1977
Related Subjects
COAL
HYDROGENATION
PYROLYSIS
COAL LIQUIDS
DISTILLATION
YIELDS
HYDROGEN
METALLURGICAL EFFECTS
BENZENE
CALORIFIC VALUE
CHARS
ETHANE
HEATING RATE
METHANE
PRESSURE DEPENDENCE
TEMPERATURE DEPENDENCE
TOLUENE
XYLENES
ALKANES
AROMATICS
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
COMBUSTION PROPERTIES
CRYOGENIC FLUIDS
DECOMPOSITION
ELEMENTS
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUELS
HYDROCARBONS
NONMETALS
ORGANIC COMPOUNDS
SEPARATION PROCESSES
THERMOCHEMICAL PROCESSES
010406* - Coal & Coal Products- Pyrolysis & Cracking- (-1987)