芳烃抽提蒸馏工艺(SED-BTX)的开发与应用

DEVELOPMENT AND APPLICATION OF AROMATICS EXTRACTION ANDDISTILLATION PROCESS(SED-BTX)

通过建立完善的相平衡数据包及过程模拟系统,开发了以加氢处理后的催化裂解加氢汽油为原料的芳烃抽提蒸馏(SED-BTX)新工艺。该工艺以抽提蒸馏为核心,将抽提蒸馏与液液抽提进行有机组合,利用各自的优势,既节能降碳,又实现轻质芳烃(BTX)产品高回收率、高纯度的目的。SED-BTX工艺在350 kt/a工业装置上应用一次开车成功,结果表明:苯产品收率达到99.9%,纯度(w)达到99.99%;甲苯产品收率达到99.9%,纯度达到99.98%;抽余油中非芳烃质量分数大于99.3%,环丁砜质量分数小于1μg/g;包括精馏部分在内的全装置综合能耗为56.6 kgOE/t(1 kgOE=41.8 MJ),相比传统的液液抽提工艺降低25%。

A new process for aromatics extraction and distillation(SED-BTX)of hydrogenated catalytic cracking gasoline was developed by establishing a comprehensive phase equilibrium data package and process simulation system.This process takes extraction distillation as the core,combines extraction distillation and liquid-liquid extraction organically,and makes use of their respective advantages to achieve the goals of energy conservation and carbon reduction,as well as high recovery rate and high purity of benzene-toluene-xylene(BTX)products.The SED-BTX process was successfully applied to a 350 kt/a industrial plant in one run.The results showed that the yield and purity of benzene product reached 99.9% and 99.99%respectively,that of toluene product reached 99.9% and 99.98% respectively,the non-aromatic content in the raffinate oil was over 99.3%,and the sulfolane content was less than 1μg/g.The comprehensive energy consumption of the whole unit including the distillation unit was 56.6 kgOE/t(1 kgOE=41.8 MJ),which was 25% lower than the traditional liquid-liquid extraction process.