Study On The FCC Dry Gas Decarbonization Technology

FCC dry gas is concentrated and refined as the complement of the ethylene raw material, which is an important means of refining the integration of resources to optimize use and reducing the cost of ethylene production. The shortcomings of the conventional MEA method is easy to foam and degradation, and the MEA regeneration temperature is higher (about125℃), which leads to the severe corrosion of the regeneration system and the acid gas load only0.3～0.4mol acid gas/mol amine. The domestic petrochemical enterprises are missing the related novel solvents and related purification technology. In order to reduce the introduction costs, and enhance our technology in related fields, this article carried out the experimental study of decarbonization solvent according to the characteristics of the catalytic desulfurization gas compostion and pressure.At first, the formulated activator B and H were screened for the dynamic test through the experiments of absorbing performance and regeneration performanc. The formulated activators B and H have large absorption capacity, fast absorption rate and easy regeneration. When the packing height is450mm and the gas-liquid ratio is400, the dynamic test results showed that the concentration of CO2in the treated gas was lower than0.2%using the formulated MDEA solutions as absorption solution. In order to facilitate the application of the formulated MDEA solution3#in industrial, it was measured its physical and chemical datas including viscosity, specific gravity, surface tension, vapor pressure. According to the dynamic test results, combined with the requirements of one refining enterprises ethylene project, it have been completed the design of catalytic dry gas decarbonization device technology package. After the industrial test, it is proved that the new developed decarburization solvent and technology can meet the requirements of pre-refined catalytic dry gas, and the major economic indicators are better than the introduction device, no wastewater, less solvent consumption, low corrosive. As a result of the application of this new decarburization technology, the petrochemical enterprises annually recovered ethylene29,600tons from the catalytic desulfurization dry gas, which results huge indirect benefits.