Physical property improvement of coal liquefaction products. Final report. [14 references]

Technical Report · Tue Mar 01 00:00:00 EST 1977

DOI:https://doi.org/10.2172/7103006· OSTI ID:7103006

Kutta, H. W.; Burk, Jr., E. H.; Beckberger, L. H.; Chao, T. S.

The objective of this work was to identify the causes of and to find ways to reduce the high viscosity of solvent-refined and H-Coal product. Viscosity reductions were made using additives, chemical modifications, and the partial removal of preasphaltenes. The major cause of high viscosity is due to the presence of preasphaltenes which were shown to be salt-like species derived from the interactions of basic nitrogen with acidic protons. At least 20 percent of the nitrogen atoms in SRC are basic, and over 80 percent of them are located in the preasphaltenes as determined by MeI precipitation. A benzene-soluble fraction was liberated from the preasphaltenes by precipitating the basic nitrogen with MeI. In this new asphaltene, 62 percent of the oxygen was analyzed as hydroxyl groups. Melt viscosity and softening temperature of H-Coal were reduced with 1-5 wt. percent of acids, anhydrides, epoxides, amines, and amides. N-methyl-2-pyrrolidone (NMP), propylene oxide, and acetic anhydride were especially promising. At 330/sup 0/F and 1 percent acetic anhydride, a reduction from 24.13 to 14.35 poise and at 2 wt. percent of propylene oxide, a reduction from 16.08 to 6.97 poise were observed. Treating costs for these three cases are estimated at $2.22, 0.60 and 1.26/bbl. Limited work indicated that these additives are less effective in viscosity reduction of SRC.

• Research Organization: Atlantic Richfield Co., Harvey, IL (USA)
• OSTI ID: 7103006
• Report Number(s): EPRI-AF-392
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
COAL LIQUIDS
VISCOSITY
H-COAL PROCESS
SOLVENT-REFINED COAL
ADDITIVES
ASPHALTENES
BENZENE
COAL LIQUEFACTION
SOLUBILITY
SOLVENT PROPERTIES
AROMATICS
ASPHALTS
BITUMENS
FUELS
HYDROCARBONS
LIQUEFACTION
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
TAR
THERMOCHEMICAL PROCESSES
010405* - Coal
Lignite
& Peat- Hydrogenation & Liquefaction
010407 - Coal & Coal Products- Solvent Extraction- (-1987)