Catalytic purification of furfural from oil sludge

What is the purpose of refining furfural? :L

Catalytic cracking is one of the most important processing methods for lightening heavy oils today. To meet the growing demand for light fuel oil and the increasing heaviness of crude oil, as well as to raise the slag blending ratio in the feedstock, some FCC units process atmospheric residue directly, while other FCC units have begun to incorporate vacuum residue into their processes. Heavier feed materials have many adverse effects on FCC units, especially coking and scaling, which prevent the units from operating properly. To prevent coking and scaling in the equipment as well as to maintain its thermal balance, many refineries use this method of discharging slurry to address this issue. As the feedstock becomes increasingly heavy, the production of oil slurry will increase further. Therefore, its effective utilization is receiving increasing attention. Currently, domestic catalytic slurry is generally shipped as an inexpensive heavy fuel oil. To obtain high-value-added products from catalytic slurry, many research efforts have been carried out to determine that the slurry can be extracted and further processed. Since the oil slurry contains 30% to 50% saturated hydrocarbons, and these saturated hydrocarbons are high-quality feedstocks for catalytic cracking ； At the same time, aromatics account for over 50% of the oil slurry; aromatics are highly valuable chemical products with a wide range of applications and promising market prospects. Therefore, it is a great shame to burn catalytic slurry as an inexpensive heavy fuel oil; utilizing it can bring significant economic benefits to refineries. Process technology: China started research on the utilization of oil slurry relatively late. Although significant progress has been made through experiments and studies in recent years, it is still in its initial stage, and more investment in scientific and technological efforts is needed. Since the catalytic cracking slurry contains about 35% saturated hydrocarbons, about 50% aromatics, as well as gums and asphaltenes, the properties of the slurry from FCC units in different refineries are shown in Table 1. After years of research and experimentation, it has been shown that the solvent extraction process can be used to achieve a preliminary separation of the oil slurry. The wax oil obtained as a result is an excellent raw material for catalytic cracking, while the oil extracted through this process contains a high proportion of aromatics (around 90%). Through further processing and refinement, high-value aromatics can be produced, thereby enabling full utilization of the oil slurry.