关键词: 芳烃抽提, 返洗液, 芳构化, ZSM-5催化剂, 降低, 烯烃

Abstract: Using the back washing liquid from the aromatics extraction unit of Yangzi Petrochemical Company as feedstock and modified ZSM-5 zeolite as catalyst, the atmospheric aromatization experiments were carried out in a 200 mL gas-solid catalytic reaction device. The effects of reaction temperature and VHSV on the aromatization reaction, catalyst stability and the regeneration of catalyst were studied. Results showed that the best aromatization results were obtained under the optimal reaction conditions of atmospheric pressure, a reaction temperature of 450℃ and a VHSV of 4h-1, and the catalyst life of once-through was about 12 h. In addition, multiple times regeneration had minor effect on the catalytic performance of modified ZSM-5 zeolite catalyst. By atmospheric aromatization the contents of cyclanes and alkenes in the back washing liquid decreased and the content of target product (aromatics) increased significantly.

Key words: aromatic extraction, the back washing liquid, aromatization, ZSM-5 zeolite catalyst, reduce, olefins