关键词: 磷缓蚀剂, 加氢精制, 催化剂失活, 杂质元素

Abstract: The contents of impurity elements in the deactivated catalyst and regenerated catalyst of industrial hydrocracking unit are determined by X-ray fluorescence spectrometer (XRF) and scanning electron microscope energy dispersive spectroscopy (SEM-EDS). The results of elemental analysis show that the deposition of a large amount of phosphorus on the particles of hydrotreating catalyst is the main reason for the deactivation of hydrotreating catalyst. SEM-EDS characterization shows that phosphorus is mainly distributed on the outer surface of catalyst particles, which not only covers the active center on the surface of catalyst, but also blocks the channel of reactants entering into the catalyst particles, resulting in the loss of overall activity of the catalyst. The results of micro reactor evaluation confirme that the phosphorus impurities in the catalyst mainly came from the phosphorus corrosion inhibitor, which is easy to combine with the active metal of the catalyst, resulting in rapid deactivation of the catalyst, and the activity can not be recovered after regeneration.

Key words: phosphorus corrosion inhibitor, hydrofining, deactivation of catalyst, impurity elements