逆流连续重整低苛刻度反应规律研究

INVESTIGATION ON REACTION BEHAVIOR OF COUNTERCURRENT CCR UNDER LOW SEVERITY

在中国石化济南分公司600kt/a逆流连续重整工业试验装置上考察了低苛刻度等温条件下催化剂积炭和反应规律,采用程序升温氧化法研究了积炭特性。结果表明:逆流连续重整工艺在工程上和技术上是可行的;与顺流相比,逆流工艺第一反应器温降下降幅度最大,各反应器温降分布趋于均匀;第三反应器和第四反应器生成的炭量总和特别是第四反生成的炭量占总积炭量的比例明显增加,而第一反应器的比例明显减少;部分环烷烃转化向第三反应器和第四反应器转移,第三反应器和第四反应器中的烷烃转化率略高于顺流;液体产物中烯烃含量在第三反应器中达到峰值,第四反应器中呈现下降趋势;逆流积炭的燃尽温度略有提高。

The behavior of coking on catalyst and catalytic reforming reaction in a countercurrent CCR unit with a capacity of 600 kt/a in SINOPEC Jinan Branch Co. was investigated. The coke combus- tion characteristics were studied with TPO. The experimental results show that the countercurrent CCR process is a commercially feasible technology l compared to concurrent CCR, the temperature drop of the 1st reactor descended most and the distribution of temperature drop in reactors becomes even, and the to tat amount of coke generated in the 3rd and 4th reactor of countercurrent CCR, especially in the 4th reac- tor, increases sharply while the proportion of the coke in the 1st reactor decreases apparently. Different from concurrent CCR, the conversion of naphthene partly shifts from the 1sh and 2st reactor to the 3rd and 4th reactor. The conversion rates of paraffin in the 3rd and 4th reactor are slightly higher than that in the 3re and 4th reactor of concurrent CCR model The olefin content in liquid products of the 3ra reactor rea- ches a peak value but declines in the 4th reactor; Compared to that of concurrent CCR, the coke burn-up temperature of countercurrent CCR rises.