Application of response surface methodology in the simulation and analysis of the catalytic cracking process in a fluidized bed

• DOI: https://doi.org/10.22533/at.ed.317592504128

• Palavras-chave: multivariable optimization, catalytic cracking, fluidized bed, response surface methodology

• Keywords: multivariable optimization, catalytic cracking, fluidized bed, response surface methodology

• Abstract:

  The fluidized catalytic cracking (FCC) process, also known as catalytic cracking, is one of the most valuable operations in the refining system due to the diversity and quality of the products obtained, which serve as feedstocks for various areas of the process complex.
  Operational deviations and supply deficiencies can compromise product quality. In this context, an alternative optimization strategy is proposed based on operational transition routes for different components of the riser outlet stream, including naphthenes, aromatics, olefins, paraffins, sulfur, and naphtha, as well as additional relevant parameters: coke formation, coke deposited on the catalyst, and overall conversion.
  The study considered vacuum gas oil feeds of 27,500, 30,000, and 30,250 BBD, processed at temperatures of 205, 368, and 532 °C and at pressures of 2.0, 2.5, and 3.5 kg·cm⁻², in a riser 36.5 m high and 1.0 m in diameter. The Akzo A/F-3 catalyst was used, whose main composition by weight corresponds to 26.69% zeolite, 37.20% alumina, and 3.746 × 10⁻²% rare earths, with standard selectivity characteristics. With these operating combinations, 27 simulation scenarios were established.
  Based on the results obtained, and using Microsoft Excel, linear and quadratic statistical models were adjusted to estimate values in intermediate sub-scenarios to the nine main scenarios for each response variable.