Solvent refined lignite process development. Quarterly technical progress report No. 2, October--December 1977

Technical Report · Fri May 26 00:00:00 EDT 1978

DOI:https://doi.org/10.2172/6423765· OSTI ID:6423765

Severson, D. E.

It was determined that recycling gas to the system did not affect the overall conversion of lignite to products nor were there apparent differences in the distribution of products. Extended solvent recycle, however, caused slightly increased yields of net liquids while decreasing the net gas yield noticeably. The overall conversion was apparently not affected. Recycling of solvent resulted in increased aromatic and decreased sulfurr contents. About 110 hours of coal processing, corresponding to about 8 1/2 solvent passes through the process, results in a lined-out solvent inventory. Long term operation of the solid-liquid separation system was not achieved. Significant conversion of lignite at very low residence times was demonstrated in a series of runs conducted using only the slurry preheater as a reactor. Up to 55 percent overall conversion of MAF lignite occurred at residence times of 27 seconds or less. This compares with residence times of greater than 2500 seconds to achieve more than 90 percent conversion. Increased reactor temperatures resulted in increased conversion. No evidence of transgranular or intergranular corrosion was found in any of prestressed metal coupons placed in the liquefaction section of the PDU. Only carbon steel showed any significant attack with corrosion proceeding throughout the period of exposure. None of the four austinitic stainless steels showed any stress corrosion cracking. Neither did the Incoloy 800 or a ferritic stainless steel. Longer exposure as well as more sophisticated analytical methods are suggested to permit detection of the low rates of corrosion.

• Research Organization: North Dakota Univ., Grand Forks (USA). Engineering Experiment Station
• DOE Contract Number: EF-77-C-02-4189
• OSTI ID: 6423765
• Report Number(s): FE-4189-11
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
36 MATERIALS SCIENCE
ORGANIC SOLVENTS
RECYCLING
SRC PROCESS
MATERIAL BALANCE
MATERIALS TESTING
PROCESS DEVELOPMENT UNITS
CHEMICAL COMPOSITION
COAL LIQUEFACTION
EXPERIMENTAL DATA
FLOWSHEETS
GRAPHS
INCOLOY 800
LIGNITE
STAINLESS STEELS
STEELS
STRESS CORROSION
TABLES
ALLOYS
BROWN COAL
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
COAL
CORROSION
CORROSION RESISTANT ALLOYS
DATA
DATA FORMS
DIAGRAMS
ENERGY SOURCES
FOSSIL FUELS
FUELS
FUNCTIONAL MODELS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
INCOLOY ALLOYS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
LIQUEFACTION
MATERIALS
NICKEL ALLOYS
NUMERICAL DATA
SOLVENTS
TESTING
THERMOCHEMICAL PROCESSES
010405* - Coal
Lignite
& Peat- Hydrogenation & Liquefaction
360105 - Metals & Alloys- Corrosion & Erosion