摘要
开发了以重油为原料直接生产乙烯的催化热裂解新工艺技术 ,详细考察了改性沸石催化剂对催化热裂解产率的影响以及催化剂的水热稳定性能 ,研究了不同原料油和操作条件对烯烃产率的影响。中型试验结果表明 ,以大庆蜡油掺 30 %减压渣油为原料 ,在反应温度 62 0℃时 ,乙烯和丙烯的质量产率分别达到 2 4 .2 7%和 1 4.70 %。对催化热裂解反应机理进行了探讨 ,表明催化热裂解是一个催化反应和热反应共存的过程 ,而新开发的催化剂具有正碳离子和自由基反应双重催化活性 ,因而可实现最大量生产乙烯的目的。
A novel catalytic conversion technology, Catalytic Pyrolysis Process, has been developed for the production of ethylene from heavy hydrocarbons. The effects of different modified zeolite catalysts, various feeds and operating conditions on light olefin yields were investigated. The hydrothermal stability performances of these catalysts were also tested. The experiment result showed that an ethylene yield of 24.27wt% and a propylene yield of 14.70 wt% can be obtained in a riser pilot plant at a riser outlet temperature of 620 ℃ by using Daqing VGO blended with 30% vacuum residual oil as feedstock. The reaction mechanism is discussed, it is proposed that both catalytic and thermal reactions take place on the catalyst possessed dual catalytic functions via carbenium ion and free radical reactions.
出处
《石油炼制与化工》
EI
CAS
CSCD
北大核心
2000年第7期40-44,共5页
Petroleum Processing and Petrochemicals
关键词
催化热裂解
乙烯
沸石
裂化催化剂
catalytic pyrolysis
ethylene
propylene
zeolite
cracking catalyst
reaction mechanism
