Influence of binary swelling solvents: Mechanism of action
Conference
·
OSTI ID:214727
- Univ. of Alabama, Tuscaloosa, AL (United States)
Green and Larsen reported that the up-take of chlorobenzene by coal is dramatically increased if small amounts of a good swelling solvent like pyridine are added. In efforts to understand how a small amount (ppm) of a good swelling solvent can exert such a pronounced effect, we have used our newly developed EPR spin probe method to examine the structural changes in binary solvent swelled (up to 5% pyridine) Argonne Premium Coal Samples (APCS). Results to date show that the unexpected up-take can be explained in terms of four different processes: (1) disruption of weak hydrogen bonds which isolate the interconnected micropore system; (2) disruption of weak hydrogen bonds which protect individual micropores, (3) competition of pyridine for the active sites involved in the hydrogen bonds or the {open_quotes}poisoning{close_quotes} of active site; (4) disruption of stronger hydrogen bonds within the macromolecules which causes an opening of the structure. Less dramatic effects are observed when more than 5% pyridine is used.
- OSTI ID:
- 214727
- Report Number(s):
- CONF-950801--
- Country of Publication:
- United States
- Language:
- English
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