摘要
在连续流动固定床装置上,探讨了非贵金属Ni/HZSM-5催化剂对裂解汽油选择加氢裂化反应的特征,考察了镍含量、温度、压力、空速及氢烃体积比等参数的影响。随镍含量的增加,裂解汽油中C6+非芳烃转化率先增加后减小,镍含量为2.1%左右较为适宜。工艺条件中温度和压力的影响较大,空速次之,氢烃体积比最小。在380℃、3.0MPa、质量空速1.245h-1、氢烃体积比1000的条件下,以镍含量为2.1%的Ni/HZSM-5为催化剂,65h内裂解汽油中C6+非芳烃组分转化率保持在95%以上,而芳烃转化率仅有13%;加氢裂化产物中,C2+正构烷烃达80.96%,其中丙烷60.71%,而甲烷和异构烷烃较少。这表明非贵金属Ni/HZSM-5催化剂可高选择性地裂化C6+非芳烃,适用于裂解汽油加氢裂化制备芳烃联产低碳烷烃。
The selective hydrocracking of pyrolysis gasoline over non-noble metal catalyst Ni/HZSM-5 was studied in a fixed down-flow reactor, and the effects of nickel content and reaction parameters such as temperature, pressure, WHSV and H2/CH volume ratio were investigated. Test results showed that with the increase of nickel loading,the conversion of C6＋ non-aromatics hydrocarbons in pyrolysis gasoline first increased and then decreased, the suitable nickel content of the catalyst was about 2.1%. Among the process conditions,temperature and pressure showed great influences, followed by WHSV and the effect of H2/CH ratio was the least. Using Ni2.1/HZSM-5 catalyst, under the conditions of 380 ~C ,3.0 MPa,a WHSV of 1,245 h^-1 and a Hz/CH volume ratio of 1 000,the conversion of C6＋ non-aromatics hydrocarbons in pyrolysis gasoline kept more than 95% within 65 h, and the conversion of aromatics was only 13 %. In the hydrocracking products,C2＋ n-alkanes occupied 80.96 %, in which propane occupied 60.71%. The results suggested that Ni/HZSM-5 catalyst having high selectivity for the hydrocracking of C6＋ non-aromatics hydrocarbons could be used for hydrocracking of pyrolysis gasoline to produce aromatics with light alkanes as co-products.
出处
《石油炼制与化工》
CAS
CSCD
北大核心
2009年第5期12-16,共5页
Petroleum Processing and Petrochemicals
