Flash Hydropyrolysis of coal. Quarterly report No. 5, January 1--March 31, 1978

Technical Report · Thu Jun 01 00:00:00 EDT 1978

DOI:https://doi.org/10.2172/6461458· OSTI ID:6461458

In the entrained tubular reactor experiments on the Flash Hydropyrolysis of lignite, methane yields up to 60% (based on the carbon content of the coal) have been observed at temperatures of 875/sup 0/C and 900/sup 0/C and a hydrogen pressure of 2500 psi. These yields were obtained at coal residence times of less than 5 seconds. The total carbon conversion including the ethane, benzene and CO amounts to as high as 70%. Some decomposition, resulting in lower methane yield, takes place at longer residence times. An additional 10% methane yield for a total of 70% conversion was obtained when the char from the experiment conducted at 900/sup 0/C was recycled through the systems at 900/sup 0/C. A number of experiments were conducted using lignite to study the effect of coal particle residence time on product yield and distribution. The conditions used were 2000 and 2500 psi hydrogen pressure, with and without preheating the hydrogen to reactor temperature in the range of 725 and 900/sup 0/C. Statistically significant degradation of the methane was not observed until reactor temperatures of 850 to 875/sup 0/C were reached. Several experiments using a sub-bituminous coal and preheated hydrogen were also conducted. The experimental equipment continues to operate with increased reliability and it is anticipated that the experimental program will be expanded to approximately 4 runs per week from the present 3 runs per week. A number of liquid samples collected from experiments conducted using lignite and a sub-bituminous coal plus one each from an iron-impregnated lignite and a calcium-oxide-treated bituminous coal have been examined. Some of the experimental data was fitted to two mathematical expressions, one developed from the kinetics and process variables of the system, and the second on empirical correlation. A complete conceptual design and economic analysis of a Coal Flash Hydropyrolysis Refining Complex has been initiated.

• Research Organization: Brookhaven National Lab. (BNL), Upton, NY (United States)
• Sponsoring Organization: USDOE Office of Fossil Energy (FE)
• DOE Contract Number: EY-76-C-02-0016
• OSTI ID: 6461458
• Report Number(s): BNL-50894
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
FLASH HYDROPYROLYSIS PROCESS
CHEMICAL REACTION YIELD
METHANE
BENZENE
COAL GASIFICATION
COAL LIQUEFACTION
CORRELATIONS
DATA
HYDROGENATION
LIGNITE
SUBBITUMINOUS COAL
TOLUENE
XYLENES
ALKANES
AROMATICS
BROWN COAL
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
COAL
CRYOGENIC FLUIDS
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUELS
GASIFICATION
HYDROCARBONS
INFORMATION
LIQUEFACTION
ORGANIC COMPOUNDS
THERMOCHEMICAL PROCESSES
YIELDS
010405* - Coal
Lignite
& Peat- Hydrogenation & Liquefaction