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Noncatalytic conversion of residuum in two‐stage coal liquefaction
Author(s) -
Stiegel G. J.,
Lett R. G.,
Cillo D. L.,
Tischer R. E.,
Narain N. K.
Publication year - 1987
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450650114
Subject(s) - residuum , coal liquefaction , liquefaction , raw material , solvent , pyrolysis , coal , hydrodesulfurization , heteroatom , chemical engineering , catalysis , chemistry , waste management , materials science , organic chemistry , geology , geochemistry , ring (chemistry) , engineering
An experimental investigation was conducted to ascertain the contribution of thermal reactions in the hydroprocessing reactor of two‐stage liquefaction processes. Various solvent/residuum feedstocks were reacted in the absence of a catalyst at temperatures ranging from 655K to 728K. Detailed characterization of the composite and fractionated feedstock and product samples was performed to ascertain the extent of residuum conversion, heteroatom removal, and hydrogen rearrangement. The results showed that hydrogenation of the solvent portion of the feedstock neither enhances residuum conversion nor results in the transfer of hydrogen from the solvent to the residuum. Higher reaction temperatures also had little effect on the reactions involved. These results suggest that the conversion of residuum in the hydroprocessing reactor of two‐stage liquefaction processes must occur catalytically rather than thermally.