扬子石化重芳烃资源利用的工艺优化

Process Optimization for Utilization of Heavy Aromatics Resource in Yangzi Petrochemical Company

扬子石化芳烃装置C10+A产量达200～250 t/d,重芳烃未得到有效利用,提高重芳烃资源利用的空间较大。将歧化单元催化剂更换为HAT-099催化剂后,通过对甲苯塔、重芳烃塔和邻二甲苯塔的操作工况进行调整优化,提高了歧化单元进料中重芳烃含量,优化了进料组成结构,使歧化装置进料中甲苯,C9A和C10+A的质量比56:32:8调整为51:37:9。通过优化歧化单元反应工艺条件,有效提高了重芳烃转化率和二甲苯收率,其歧化单元多处理C10+A约45 t/d,C8A多产出约150 t/d。以目标产品计,装置综合能耗由优化调整前的69.40 kg/t降低至优化调整后的67.34 kg/t。

The production of C10^＋A from the aromatics plant of Yangzi Petrochemical Company was 200-250 t/d, but the heavy aromatics resource was not utilized effectively. In order to solve the problem, Yangzi Petrochemical Company replaced the catalyst of disproportionation unit with HAT-099 catalyst, optimized the operational conditions of toluene column, heavy aromatics column, and o-xylene column, increased the content of C10^＋A in the feed stock, optimized the composition of feed, and increased the mass ratio of toluene to CgA and C10^＋A in feed of disproportionation unit from 56：32：8 to 51：37：9. The results showed that optimization of process conditions for disproportionation unit led to higher conversion of heavy aromatics and higher yield ofxylene. The treatment capacity for C10^＋A increased by about 45 t/d, the production capacity of C10^＋A increased by 150 t/d and the energy consumption decreased from 69.40 to 67.34 kg/t（the energy consumption was calculated by the consumption of standard oil for producing per ton of benzene and C8A）.