【摘要】 建立了一套下行式循环流化床反应装置 ,利用此装置进行了重油催化裂解制取低碳烯烃的实验研究 .以中间基丙烷脱沥青油 (DAO)为原料、工业CHP 1分子筛平衡剂为催化剂 ,主要考察了下行床反应器中反应温度和剂油比对实验结果的影响 .试验表明 :当以丙烯、丁烯为目标产物时 ,反应温度存在最佳值 ,剂油比越大低碳烯烃收率越高 .由于下行床具有短停留时间、气固流动更均匀和返混小的优点 ,能获得更高的产品收率 ,使干气收率受到抑制 .试验结果说明下行床反应器是一种适合于石油烃类裂解工艺过程的反应器形式 .更多还原

【Abstract】 A hot model of a gas-solid circulating fluid downer reactor was built to study the deep catalytic cracking process with DAO feedstock and commercial equilibrium CHP-1 catalyst. The influence of reaction temperature and catalyst to oil ratio(CTO) on product′s distribution was examined. The experiments showed, with the increase of reaction temperature, light olefin yields increased at first to a maximum and then decreased. However, the light olefin yields increased with the increase of CTO. Owing to the short residence time, more uniform gas-solid flow and reduced backmixing of downer reactor, it can obtain more object products and the dry gas yield can be inhibited. The experiment results indicate that the downer reactor is suitable for deep catalytic cracking of heavy oil which needs high severity reaction condition.更多还原