加氢裂化催化剂对VGO生产重石脑油的影响  

Effect of Hydrocracking Catalysts on Production of Heavy Naphtha From VGO

作　　者：王晓炜 毛以朝 胡志海 赵广乐 王永睿 WANG Xiaowei;MAO Yichao;HU Zhihai;ZHAO Guangle;Wang Yongrui(SINOPEC Research Institute of Petroleum Processing Co.,Ltd.,Beijing 100083,China)

机构地区：[1]中石化石油化工科学研究院有限公司,北京100083

出　　处：《石油学报（石油加工）》2023年第3期497-507,共11页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：中国石油化工股份有限公司合同项目(S120050-2)基金资助。

摘　　要：为了提高加氢裂化催化剂重石脑油的选择性,分别采用USY、Hβ分子筛为载体负载NiW金属制备加氢裂化催化剂CUSY和CB,并采用BET、XRD、XPS、Pyd-IR、HRTEM、TG-MS等分析手段对分子筛与催化剂进行表征,以上海石化VGO为原料油,在固定床中试装置上对CUSY和CB催化剂进行加氢裂化反应性能评价。结果表明:与USY分子筛相比,Hβ分子筛中含有更多的介孔结构,其介孔表面积与体积分别提高了127 m^(2)/g和0.257 cm^(3)/g;但USY分子筛、载体与催化剂的总酸量和B酸酸量均为Hβ分子筛、载体及催化剂的2倍多,加氢裂化后的CUSY催化剂的硫化度比CB低6.7百分点,其加氢活性相晶粒尺寸更大;在氢气压力13.0 MPa、温度350~365℃、氢/油体积比1200、精制和裂化体积空速分别为1.3和1.8 h^(-1)的条件下,与CUSY催化剂相比,CB催化剂更有利于链烷烃的转化,进而增加重石脑油链烷烃含量;在相同转化率下,CUSY催化剂作用下重石脑油选择性比CB催化剂高约1.83百分点,芳烃潜含量(质量分数)高12.2百分点。这说明抑制烷烃的转化是提高重石脑油馏分选择性和芳潜的重要因素。To improve the selectivity of heavy naphtha on hydrocracking catalyst,CUSY and CB hydrocracking catalysts were prepared using USY or Hβzeolite as the carrier loading NiW metal;meanwhile,the zeolites and catalysts were characterized by BET,XRD,XPS,Pyd-IR,HRTEM and TG-MS.The evaluation of hydrocracking reaction property was carried on a fixed-bed reactor for CUSY and CB by use of vacuum gas oil(VGO)from Sinopec Shanghai Petrochemical Co.,Ltd.(hereinafter referred as Shanghai VGO).The results show that compared with USY zeolite,Hβzeolite contains more mesostructures,of which the mesoporous surface area and volume are increased by 127 m^(2)/g and 0.257 cm^(3)/g,respectively.However,the total acid amount and Br∅nsted acid amount of USY zeolite,carrier and catalyst are more than twice those of Hβzeolite;the sulfidity of hydrocracked CUSY catalyst is 6.7 percentage points lower than that of CB catalyst,and the grain size of hydrogenation active phase is larger.Besides,compared with CUSY catalyst,CB catalyst is favorable to convert the alkane at the hydrogen pressure of 13.0 MPa,temperature of 350—365℃,hydrogen/oil volume ratio of 1200,and volume space velocity of 1.3 and 1.8 h^(-1) for refining and cracking,so as to increase the content of alkane in heavy naphtha.Under the same conversion rate,the selectivity of heavy naphtha under the action of CUSY catalyst is about 1.83 percentage points higher than CB catalyst,and the potential aromatic content(mass fraction)is 12.2 percentage points higher.This means that inhibiting the conversion of alkanes is an important factor to improve the selectivity and aromatic potential of heavy naphtha distillate.

关 键 词：重石脑油 孔性质 HΒ分子筛 USY分子筛 加氢裂化 

分 类 号：TE624[石油与天然气工程—油气加工工程] TQ426.95[化学工程]