Study On Thermal Treatment Of Coker Heavy Gatch To Produce Needle Coke

The influence of the structure and property of Jinzhou coker heavy gatch on formation of needle coke was investigated by using elemental analysis, liquid chromatogram, FT-IR spectroscopy and molecular weight determination. Fluid catalytic cracking decant oil ( FCCDO ) is appropriate feedstocks for needle coke production, but insufficient. Coker heavy gatch may be a potential feedstocks for needle coke production and suitable for needle coke production by a series of pretreatment. In the study, thermal treament of Jinzhou coker heavy fatch was investigated under different thermal reaction conditions. The results demonstrated that the target fraction yield decreased and its aromatics content had a tendency to increase gradually.The target fraction of thermal treament were then subjected to carbonization. The effect of reaction conditions on the carbonization, such as reaction temperature and reaction pressure, were systematically studied. It was found that the optimum condition on the carbonization is 480℃and 1.2MPa and the optimum target fraction from thermal treament is produced under the condition of 430℃and 100min. The optical texture of the resultant coke, which was produced from the carbonization of the optimum target fraction from thermal treament under these optimum conditions, presented an well-developed flow-domain anisotropic structure. The resultant residue were separated into four fractions, i.e. heptane solubles ( HS ), toluene solubles ( TS ), pyridine solubles ( PS ) and pyridine insolubles ( PI ), sequentially by extracting with heptane , toluene and pyridine, respectively. The conversion of HS to PI occurs according to the following scheme: HS→TS→PS→PI. The kinetic of the formation of PI was systematically studied. Result indicated that the formation of PI was a second order reation, and its activation energy was 152 kJ·mol^-1.