Direct liquefaction of low-rank coal. Quarterly technical progress report, April 1, 1995--June 30, 1995 Page: 3 of 13
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DIRECT LIQUEFACTION OF LOW-RANK COAL
Grant No. DE-FG22-94PC94050
A multistep direct liquefaction process specifically aimed at low-rank coals (LRCs) has been
developed at the Energy & Environmental Research Center (EERC). The process consists of a
preconversion treatment to prepare the coal for solubilization, solubilization of the coal in the
solvent, and polishing using a phenolic solvent or solvent blend to complete solubilization of the
remaining material. The product of these three steps can then be upgraded during a traditional
This project will address two research questions necessary for the further development and
scaleup of this process: 1) determination of the recyclability of the solvent used during
solubilization and 2) determination of the minimum severity required for effective hydrotreatment
of the liquid product. The project will be performed as two tasks, the first consisting of ten
recycle tests and the second consisting of twelve hydrotreatment tests performed at various
Several activities were performed during this quarter:
" A paper entitled "Solvent Recyclability in a Multistep Direct Liquefaction Process" was
prepared for presentation at the Coal Liquefaction and Gas Conversion Contractors'
Review Conference that will be held August 29-31, 1995.
* A no-cost project extension was requested and granted.
* Tests 3 through 8 in Task 1 were completed during this quarter. The pretreatment,
solubilization, and polishing steps of Test 9 were completed.
During the Task 1 testing, the following were noted:
* The process remained both operationally and chemically constant.
" The Karl Fischer water analysis is not precise enough for use in yield structure
calculations. Adequate data can be obtained by averaging the Karl Fischer water analysis
results and the results of the physical separation that is performed during the distillation
" This process produces adequate quantities of excess solvent for recycle.
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Hetland, M.D. Direct liquefaction of low-rank coal. Quarterly technical progress report, April 1, 1995--June 30, 1995, report, July 1, 1995; Grand Forks, North Dakota. (digital.library.unt.edu/ark:/67531/metadc618539/m1/3/: accessed September 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.