The Hydrogenation Of Pyrolysis Shihezi Bituminous Coal

Xinjiang is rich in coal resources, ranking the first in China. With the development of regional economy and energy chemical industry, coal chemical industry has become the largest potential industry in Xinjiang.In this paper,Pt/Al2O3 and Ni/Al2O3 were prepared by incipient impregnation method.The pyrolysis was performed under H2 atmosphere to analyses of the gas flow rate, etc compared with N2 atmosphere. Catalytic hydropyrolysis was also investigated with Ni/Al2O3, Pt/Al2O3 catalysts. The results show that, tar yield increased with the increasing of temperature in N2 atmosphere and H2 atmosphere. The tar yield increased with the temperature and reached the maximum 4.42%, 5.27% at 650℃, 600℃ under N2 atmosphere and H2 atmosphere, respectively. The tar yield of catalytic hydropyrolysis with Ni, Pt also increased with the increasing of temperature. The largest tar yield of hydropyrolysis with Ni, Pt is 4.97%, 5.70% in 650℃, 600℃ respectively. Therefore the composition does not change larger in hydropyrolysis and catalytic hydropyrolysis. On the other hand, the tar yield increased with the increasing of gas flow rate, and then decreased with the further increasing flow rate. The tar yield reaches the maximum at 400 m L/min in hydropyrolysis and catalytic hydropyrolysis.In this paper,pyrolysis of Shihezi bituminous coal was studied in a fixed bed reactor. The multi-stage pyrolysis and single stage pyrolysis was performed under N2 and H2 atmosphere to analyses of the tar yield, char yield, the proportion of maltene and asphaltene. Catalytic hydropyrolysis was also investigated with Ni/Al2O3, Pt/Al2O3 catalysts.The results show that, tar yield decreased with the increasing of temperature in multi-stage pyrolysis. The tar yield in N2 atmosphere was 4.3%, 0.53%, 0.39% in Stage I, Stage II, Stage III, respectively. Pyrolysis in H2 atmosphere and catalytic hydropyrolysis with Ni, Pt is about 1.2, 3, 2 times than in N2 atmosphere, respectively. The multi-stage pyrolysis is favor to improve tar yield. From the tar analysis, it is found that pyrolysis in H2 atmosphere and catalytic hydropyrolysis has a little effect on C13-C25 of aliphatic in Stage I, at the same time it can also improve the C11-C15 in Stage II, and C9-C18 in Stage III in aliphatic. Moreover, it also has a positive effect on non-aliphatic fraction.In this paper, the pyrolysis was performed in a fixed bed reactor to analyses of the solvent extraction, atmosphere, temperature. The results show that,R1 release more C10-C16 of aliphatic and C10-C13 of non-aliphatic in maltene. Small molecules contain more aliphatic in C13-C24 than coal structure produce in pyrolysis time. At the same time, we can conclude there is little covalent bond disrupting during pyrolysis time in E1. The tar yield and pyrolysis gas of M1 are higher than raw coal, AC and R1, we can know that the disrupting of non-covalent bond has a positive effect on pyrolysis. Finally, hydropyrolysis have little effect on E1, however, it is positive to R1, especially, the yield of asphaltene.