Preparation of Ultrastable USY Molecular Sieve

Ultra-stable USY molecular sieves and REUSY rare earth ultra-stable y-type molecular sieves are widely used in catalytic cracking and hydrocracking processes. my country’s oil refining process is facing the technical pressure of poor oil quality and heavy oil pressure. VGO (vacuum gas) with high sulfur and nitrogen content Oil), CGO (coking gas oil), and the production of Fcc catalytic cracking Lco (light cycle oil) are also increasing. Although the three fractions of oil can be used as raw materials for Fcc, the amount of sulfur and nitrogen aromatics is high, which directly affects the catalytic cracking The product and quality of the operation. Therefore, the medium-pressure hydrotreating pretreatment of sulfur-containing VGO, CGO, LCO and heavy oil with reduced slag is to optimize the process for desulfurization, denitrification, selective hydrogenation, diesel upgrading, and polycyclic aromatic hydrocarbon saturation selectivity. The raw material of the main hydrogenation technology for partial fracture of the structure.

Y-type molecular sieves belong to the same class of faujasites, their lattice structure is similar to X, but the ratio of silicon to aluminum is different, X-type is 2.0~3.0, and Y-type is 3.0-6.0, so Y-type molecular sieve has thermally stable acidic activity The central energy is strong, especially the ammonium exchange of USY at low temperature and high temperature twice, which makes its hydrocracking activity and stability, which has obvious advantages.