Advanced research for the characterization of hydrogen donor solvents in two-stage liquefaction. Quarterly report, January 1-March 31, 1984

Technical Report · Sun Apr 01 04:00:00 EST 1984

OSTI ID:6911354

Coghill, D R; Potts, J D

Two solvents with an intermediate hydrogen content (about 7.5%) and different boiling point distributions were prepared and used for Subtask 3.1 in order to determine the effect which the different boiling point distributions would have on SCT coal liquefaction. These two solvents were an 85/15 weight percent blend of Lummus hydrogenated KC-Oil and SCT extract from Illinois No. 6 coal (called Solvent B) and a 42.5/40/17.5 weight percent blend of raw KC-Oil, Xytel hydrogenated KC-Oil and Illinois No. 6 SCT extract (called Solvent C). Two eleven-run matrices of microautoclave runs were completed using Illinois No. 6 coal and Solvents B and C. Solvent B is capable of achieving 90% conversion of Illinois No. 6 coal at a wide range of SCT conditions. Increasing the residence time from 2 to 10 minutes allows the use of lower temperatures (803/sup 0/F instead of 850/sup 0/F) to achieve 90% conversion. Once a coal conversion of 90% is reached, increasing temperature and time reduces the net product preasphaltenes and asphaltenes and increases the net product oil. Hydrogen consumption and C/sub 1/ to C/sub 4/ gas make also increase with temperature and time. Pressure variations from 500 to 2500 psig have no effect on coal conversion with Solvent B. Product quality decreases with lower pressure by resulting in slightly lower net asphaltenes and slightly higher net preasphaltenes, lower feed desulfurization and lower liquid product H/C ratios. Hydrogen consumption is also slightly reduced. Solvent C is also capable of achieving 90% conversion of Illinois No. 6 coal but at a narrower range of SCT conditions than the range observed with Solvent B. Varying the residence time has very little effect on coal conversion with Solvent C so the temperature range at which 90% conversion can be obtained is smaller (822/sup 0/F to 850/sup 0/F instead of 803/sup 0/F to 850/sup 0/F). As with Solvent B, increasing temperature and time reduced net preasphaltenes and net asphaltenes and increased net oil.

• Research Organization: Cities Service Research and Development Co., Tulsa, OK (USA)
• DOE Contract Number: AC22-83PC60047
• OSTI ID: 6911354
• Report Number(s): DOE/PC/60047-T3; ON: DE84010316
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
AUTOCLAVES
CHEMICAL REACTIONS
COAL LIQUEFACTION
COMPARATIVE EVALUATIONS
CONSUMPTION RATES
DATA
ELEMENTS
EXPERIMENTAL DATA
HYDROGEN
HYDROGENATION
INFORMATION
LIQUEFACTION
NONMETALS
NUMERICAL DATA
ORGANIC SOLVENTS
PRESSURE DEPENDENCE
SOLVENTS
TEMPERATURE DEPENDENCE
THERMOCHEMICAL PROCESSES
TIME DEPENDENCE
TSL PROCESS