A catalyst for non-hydrogenation deolefination of aromatic hydrocarbons and its preparation method

Abstract

The invention uses waste catalytic cracking catalysts as raw materials to prepare aromatic hydrocarbon non-hydrogenation deolefin catalysts. The waste catalytic cracking catalyst with a metal content of less than 5000 μg / g is mixed with alumina dry rubber powder and extruded into a rod, and roasted at 540°C for 4 hours to obtain an aromatic hydrocarbon non-hydrogenated deolefin catalyst. Wherein the mass content of the waste catalytic cracking catalyst is 60-80%, and the alumina content is 20-40%; the acid content of the catalyst is 0.3-0.5mmol / g, the specific surface area is 290-320m2 / g, and the average pore diameter is 8.5-10nm; The catalyst catalyzes the non-hydrogenation deolefination of aromatics, and can generally reduce the bromine value of raw materials from 3000mg / 100g to below 20mg / 100g, and the loss of aromatics is less than 0.01%.

Description

Technical field [0001] The invention relates to a catalyst for removing olefins, more specifically a catalyst for removing trace olefin impurities from aromatic hydrocarbon mixtures without hydrogen and a preparation method thereof. Background technique [0002] At present, in the petrochemical industry, the production of aromatics mainly adopts catalytic reforming and steam cracking processes. While using these processes to convert petroleum fractions such as naphtha, light diesel oil and hydrogenated tail oil into BTX (benzene, toluene, xylene), a small amount of olefins will be produced, and the general content of the product composition is less than the mass fraction 1%. This part of a small amount of olefins is chemically active due to the presence of carbon-carbon double bonds in the molecular structure. Since the subsequent processing of aromatic hydrocarbons, such as xylene isomerization, toluene disproportionation, xylene adsorption separation, and benzene alkylation, ...

AI Technical Summary

Problems solved by technology

Compared with activated clay catalysts, these research results have certain advantages, but the catalyst preparation process is complicated, the cost is high, and pollutants such as waste water and waste gas will be discharged to the environment during the catalyst preparation process.