中文摘要：

以中温煤沥青为原料,三种氯代芳烃为改性剂,对甲基苯磺酸为催化剂,对煤沥青进行了改性研究.改性煤沥青通过FT-IR和TG进行分析,中间相结构采用光学偏光显微镜进行了观察,针状焦采用XRD分析.结果表明,不同氯代芳烃化合物对改性煤沥青炭化产率有着不同的影响,其光学组织结构中的纤维成分均得到提高：其中,经3-氯硝基苯改性后的炭化产率增加了42.5%,其光学组织呈典型的长程纤维结构;而XRD分析亦表明,002峰位往高角度方向迁移,峰形更加尖锐突出,Lc明显增大都表明石墨化进行较充分.

英文摘要：

With three kinds of different atoms chlorinated aromatic compounds in the presence of p-toluene sulfonic acid, coal tar pitch has been modified successfully. The properties of the modified coal-tar pitch （MCTP） were observed by Fourier transform infra-red spectroscopy and thermo gravimetric analyzer （TG） respectively. Polarized microscope was employed to study its mesophase structure of the MCTP; and the crystallinity of the needle coke obtained through MCTP was investigated by X-ray diffractometer （XRD）. The results show that the carbonization yield of MCTP1 produced by 1-chloro-3-nitrobenzene as a modified agent is the highest among the selected modified agents, which arrive at 50. 1%. And the optical structure of its mesophase emerges a typical long fibrous organization. For the needle coke from MCTP,, the results of XRD showed that the 002 peak moves to higher angle and becomes sharper, and Lc increases signifi- cantly comparing to the coke from MCTP, which was not modified. It indicates that the degree of graphitization has been enhanced greatly after modification.