A kind of purification method of catalytic cracking oil slurry

Abstract

The invention provides a catalytic cracking oil slurry purification method, and belongs to the technical field of solid-liquid separation. The method comprises the following steps that (1) after high-temperature oil slurry and light-weight solvent oil are mixed, the mixture enters a pre-separation chamber for still standing layering, wherein the upper layer is a light-weight oil slurry layer; thelower layer is a heavy reside slurry layer; (2) the light weight oil slurry of the light weight oil slurry layer overflows to a light weight oil slurry chamber after being subjected to high-pressure electric field separation; (3) light weight oil slurry in the light weight oil slurry chamber enters a bed layer type filter (4) to be filtered so as to obtain clarified oil slurry. The catalytic cracking oil slurry purification method has the advantages that the oil slurry is subjected to pre-separation through the dual effects of the gravity and the electric field; most catalyst particles in oilslurry, partial colloid, asphaltine and the like are firstly separated in a pre-separator; the burden of the subsequent bed layer type filter is greatly reduced; the operation period of a filtering system is obviously prolonged.

Description

technical field [0001] A catalytic cracking oil slurry purification method belongs to the technical field of solid-liquid separation. Background technique [0002] Catalytic cracking is an important secondary processing method for lightening heavy oil, and is the core device of every refinery. As the processing depth of the oil refining industry continues to increase and the raw materials are getting heavier, in order to ensure stable operation of the device, reduce the temperature of the regenerator, reduce the amount of coke, and improve the processing capacity of the device, the external oil slurry process is an essential measure. . The oil slurry thrown out is mainly treated as a blending component of fuel oil at this stage, but because the oil slurry without purification treatment contains a large amount of solid particles of aluminum silicate molecular sieve catalyst, even if it is directly burned, it will cause dust accumulation in the furnace tube, making the The h...

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Problems solved by technology

In foreign countries, American PALL Company adopts multi-layer wire mesh sintered filter element, and MOTT Company adopts stainless steel powder sintered filter element to develop oil slurry filtration, purification and separation technology, which have been successfully applied in foreign catalytic cracking units, but most of them are used in China. The effect is not ideal due to acclimatization, the main reason is that domestic catalytic raw materials are much worse than foreign countries, the properties of oil slurry are worse, the density and viscosity are increased, the content of colloid and asphaltene is generally high, and the filter element is easily blocked. It is difficult to run stably for a long period of time, which poses new challenges to the removal of solid particles in domestic oil slurry

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