轮古稠油与煤焦油混合原料悬浮床加氢裂化研究

STUDY ON THE SLURRY-BED HYDROCRACKING REACTIONSOF THE MIXTURE OF COAL-TAR AND LUNGU HEAVY OIL

采用高压釜对轮古稠油和某煤焦油的混合油进行各种类型的反应研究,考察了反应条件以及催化剂浓度、稠油与煤焦油质量比、供氢剂和蜡油循环对产物分布的影响。结果表明,在氢气和分散性催化剂存在下的悬浮床加氢裂化反应较之热裂化及临氢裂化反应有效地抑制了生焦及气体产率,增加了中间馏分油收率。较适宜的反应条件为:温度430℃、时间60min、压力7.0MPa;催化剂用量150μg/g;稠油与煤焦油质量比3∶1。从生焦指数来看,镍催化剂的催化加氢性能优于铁催化剂。添加供氢剂以及蜡油循环均可抑制进料的裂化反应和焦炭的生成,最大限度地提高反应转化率。

The reaction modes, such as thermal cracking, cracking with the presence of catalyst and/or hydrogen, for processing the mixture of Lungu heavy oil and a kind of coal-tar were studied using an autoclave reactor. The effects of reaction conditions, catalyst dosage, ratio of heavy oil to coal-tar, the presence of hydrogen donor and the recycle of wax oil on the product slates were investigated in detail. Results indicated that as compared with thermal cracking and hydrocracking, slurry-bed hydroeraeking with the presence of dispersed catalyst could effectively suppress the formation of coke and gas, and the yields of middle distillates were increased. The optimum reaction conditions were a reaction temperature of 430 ℃ ,a reaction pressure of 7.0 MPa,a reaction time of 60 min,a mass ratio of heavy oil to coal-tar of 3 and a catalyst dosage of 150 μg/g. The addition of hydrogen donor and the recycle of wax oil could suppress cracking and coke formation, thus ,maximum conversion might be obtained.