Exploratory Investigation for the Coking Behavior during Slurry-bed Hydrocracking of Coal Tar Atmospheric Residue
2016
Deng, Wenan | Du, Juntao | Li, Chuan | Wu, Lele | Zhang, Zailong | Guo, Ruilong
The coking behavior of coal tar atmospheric residue (CTAR) during slurry-bed hydrocracking was studied. The CTAR hydrocracking was performed in the autoclave at 430 °C with H₂ pressure of 13 MPa, comparing with that of the Merey atmospheric residue (MRAR). The properties of C₇-asphaltene and toluene-insoluble in feedstocks and products were analyzed respectively to describe the CTAR coking behavior during slurry-bed hydrocracking. The experimental results showed that CTAR with higher asphaltene content (30 wt%) produced less amount of coke than MRAR with asphaltene content (9.29 wt%), and little coke on the inner surface of reactor was found. The toluene-insoluble in the feedstock contained the larger carbonaceous particles (about 7 μm) and the inorganic fine particles (about 1 μm). Both sulfurized catalyst particles and inorganic fine particles in CTAR provided independent condensation nuclear or growth nuclear for macromolecular radicals during slurry-bed hydrocracking. These particles promoted the dispersion of spherical coke precursor and inhibited the coalescence of coke precursor. The larger carbonaceous particles in CTAR carried spherical coke particles as coke-carrier.
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