Product composition and coke deposition in the hydrocracking of polystyrene blended with vacuum gasoil

A six-lump kinetic model for HDPE/VGO blend hydrocracking

“…Furthermore, the necessity for drastically reducing CO 2 emissions and the incentives for recycling policies (Circular Economy) trigger an increasing interest for hydrocracking alternative streams to petroleum-derived ones. Among them, do stand out vegetable oils [3], biomass pyrolysis oils [4] and wastes from the consumers society, such as waste plastics [5] and end-of-life tires [6].…”

Hydrocracking Mechanisms of Oxygenated Plastics and Vacuum Gasoil Blends

“…We used bimetallic Pt-Pd supported on a faujasite type of zeolite (HY zeolite), synthesized as explained in a previous work [19].…”

“…After the reaction, the stirring was stopped, the hydrogen flow was set to zero, and the system was cooled following a controlled temperature ramp (20 °C min -1 ) and then depressurized. Liquid and solid products were collected and separated applying a filtration-extraction methodology [19]. First, vacuum filtration separated solid products (spent catalyst and unreacted polymer) from the liquid product blend.…”

“…The seemingly easy conversion of polymers at the studied conditions can be established as the leading cause of the higher HCO conversion in polymer/VGO blends, which seems to be directly related to the plastic conversion degree. Previous studies on plastics hydrocracking [19] have demonstrated that the unconverted plastic can act as a barrier between the active catalyst This preprint research paper has not been peer reviewed. Electronic copy available at: https://ssrn.com/abstract=4401490 P r e p r i n t n o t p e e r r e v i e w e d sites and the feedstock, hindering their conversion.…”

“…Electronic copy available at: https://ssrn.com/abstract=4401490 P r e p r i n t n o t p e e r r e v i e w e d treatment to adjust to environmental regulations [18]. Traditionally, hydrocracking studies on plastic waste valorization have focused on hydrocarbon-based polymers [19,20], whereas heteroatom-containing plastics have gone comparatively unnoticed. However, exploring the latter's potential, especially oxygenated plastics, has clear interest from both the industrial (the presence of heteroatoms can affect hydroprocessing unit operation [21][22][23]) and environmental perspectives, given the heterogeneous composition of MSW.…”