摘要
以大庆常压渣油为原料 ,针对A ,B两种不同类型的催化剂 ,采用小型固定流化床实验装置 ,考察了剂油比对催化裂解气体产物分布的影响。研究发现 ,不同类型的催化剂 ,其剂油比对裂解气体产物中各组分收率的影响规律不尽相同。对于A型催化剂 ,在反应温度为 70 0℃、水油比为 0 .6 3和停留时间为 1.8s的实验条件下 ,总低碳烯烃收率在 5 0 %以上 ,并且随剂油比的增大 ,总低碳烯烃收率线性增加 ;对于B型催化剂 ,在反应温度为 6 5 0℃、水油比为 0 75和停留时间为 1.7s的实验条件下 ,总低碳烯烃收率最高可达 4 4 % ,并且随剂油比的增加 ,总低碳烯烃收率有一个最大值。用最小二乘法对实验数据进行回归 ,得出了实验考察范围内乙烯、丙烯、丁烯和总低碳烯烃收率随剂油比的变化规律。实验结果还显示 ,催化剂对催化裂解起重要作用 ;不同类型的催化剂 ,不仅裂解产物的变化规律不同 。
The effects of catalyst-to-oil ratio on the distribution of catalytic pyrolysis gas products with two kinds of catalysts A and B were investigated in a confined fluidized bed reactor, taking Daqing atmospheric residue as the feedstock. The composition of catalytic pyrolysis gas was analyzed by using the HP6890 gas chromatogram. The results show that the effects of catalyst-to-oil ratio on the yields of light olefins, hydrogen and methane yield varied with the types of catalysts. For the catalyst A, under the optimized operation conditions of reaction temperature at 700 ℃, water-to-oil ratio of 0.63 and residence time of 1.8 seconds, the total yield of light olefins is over 50 percent. With the increase of catalyst-oil weight ratio, the total yield of light olefins increased linearly. For the catalyst B, under the conditions of reaction temperature at 650 ℃, water-to-oil ratio of 0.75 and residence time of 1.7 seconds, the total yield of light olefins showed a maximum value of 44 percent with increasing catalyst-to-oil ratio. Experiment data were analyzed by the least square method, and the experiential formulas for expressing variations of the yields of ethylene, propylene, butylene and the total olefins with catalyst-to-oil ratio were obtained. Both the yields of cracking pyrolysis products and the reaction mechanism varied greatly with the types of catalysts.
出处
《石油大学学报（自然科学版）》
EI
CSCD
北大核心
2004年第2期99-102,共4页
Journal of the University of Petroleum,China(Edition of Natural Science)
关键词
渣油
催化裂解气体
烯烃
收率
剂油比
重油催化裂解技术
Daqing atmospheric residue
catalytic pyrolysis
gas production
catalyst-to-oil ratio
light olefin yield
