Project Lignite. Quarterly technical progress report No. 9, April, May, and June 1976 and annual summary, fiscal year 1976

Technical Report · Fri Oct 29 00:00:00 EDT 1976

DOI:https://doi.org/10.2172/7331643· OSTI ID:7331643

Severson, D. E.

Six runs on the liquefaction section of the PDU were made, including four in which solid-liquid separation was attempted. Solvent recovery of close to 100 percent was achieved in runs at 2500 psig. Operation with one dissolver was most successful. Half a dissolver gave unacceptably low conversions. Best operating conditions to date are 750/sup 0/F preheater outlet temperature, 830/sup 0/F dissolver outlet temperature, 1.8 weight ratio solvent to lignite, space velocities of 1.4 for liquids and 300 for gases, and vacuum flash temperature 600/sup 0/F. Conversion increases with increasing dissolver temperature but liquids yield decreases. Viscosity and melt point of vacuum bottoms increases progressively during a run. No problems have appeared in the use of Incoloy 800 dissolvers and preheaters. Piping was altered to permit solid-liquid separation ahead of vacuum flash since vacuum flash bottoms tended to be excessively viscous in the previous operation mode. An autoclave run on a lignite sample of that charged to PDU gave yields close to PDU results. A Chilean lignite was converted in the autoclave and was found to give liquid yields comparable to North Dakota lignites, lower gas yield and water consumption, and heavier liquid products. Vapor pressure curves obtained for FS-120 solvent were slightly different from those for petroleum materials in the API Technical Data Book--Petroleum Refining.

• Research Organization: North Dakota Univ., Grand Forks (USA). Engineering Experiment Station
• DOE Contract Number: E(49-18)-1224
• OSTI ID: 7331643
• Report Number(s): FE-1224-61
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
COAL LIQUEFACTION
CHEMICAL REACTION YIELD
PROCESS DEVELOPMENT UNITS
LIGNITE
CARBONIZATION
SOLVENT-REFINED COAL
HYDROGENATION
AUTOCLAVES
COAL LIQUIDS
COMPARATIVE EVALUATIONS
DEASHING
DISSOLUTION
DISSOLVERS
INCOLOY 800
OPERATION
ORGANIC SOLVENTS
PIPES
RECOVERY
SEPARATION PROCESSES
TEMPERATURE DEPENDENCE
ALLOYS
BROWN COAL
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
COAL
DECOMPOSITION
ENERGY SOURCES
FOSSIL FUELS
FUELS
FUNCTIONAL MODELS
HEAT RESISTING ALLOYS
INCOLOY ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
LIQUEFACTION
NICKEL ALLOYS
SOLVENTS
YIELDS
010405* - Coal
Lignite
& Peat- Hydrogenation & Liquefaction