FCC raw material liquid phase hydrotreatment system and method

Abstract

The invention discloses an FCC raw material liquid phase hydrotreatment system and method. The method comprises the steps that 1, fresh FCC raw material feeding is subjected to heat exchange through aheat exchanger, a heating furnace conducts heating, and hydrogen is fully mixed through a first hydrogen mixer; step 2, after the step 1, the hydrogen-dissolved FCC raw material enters a pre-reactorof a liquid-phase hydrogenation pre-reaction unit to be subjected to demetalization, residual carbon removal reaction and partial removal of sulfide and nitride; 3, the pre-reaction product generatedin the step 2 is subjected to hydrogen mixing again through a hydrogen steam stripping unit and a second hydrogen mixer and then enters a liquid phase hydrogenation main reactor of a main reaction unit to be subjected to deep removal of sulfide, nitride and aromatic hydrocarbon; 4, the main reaction product generated in the step 3, without heat exchange, enters a high-temperature and low-pressureflash tank for gas-liquid separation after being subjected to pressure reduction, and an obtained liquid-phase material is subjected to heat exchange to obtain a refined product. According to the invention, a circulating hydrogen and circulating oil system is canceled, and a proper process and novel technical equipment are adopted, so that the dissolved hydrogen amount of the FCC raw material andthe intersolubility uniformity with hydrogen are increased, the hydrogenation reaction efficiency is improved, and the device energy consumption and the equipment investment cost are reduced.

Description

technical field [0001] The invention belongs to the field of petroleum processing and relates to a liquid phase hydrogenation process, in particular to a liquid phase hydrogenation treatment system and method for FCC raw materials. Background technique [0002] As my country's environmental protection regulations become increasingly stringent, the quality requirements for petroleum products, especially light fuels such as gasoline and diesel, are also becoming higher and higher. Catalytic cracking (FCC) process is one of the important secondary processing methods of crude oil because of its strong adaptability of raw materials, high added value of products and good economic benefits. At present, my country's FCC gasoline accounts for about 70% of the gasoline pool, and FCC diesel accounts for about 30% of the diesel pool. Faced with the increasing processing volume of inferior crude oil year by year, how to effectively improve the quality of FCC raw materials, reduce the co...

AI Technical Summary

Problems solved by technology

Although this method cancels the circulating pump and the circulating hydrogen system, the H 2 S and NH 3 The removal effect of the hydrogen gas distributor is not ideal. The hydrogen bubbles with diameters of millimeters or microns dispersed in the liquid phase material will cause the discontinuity of the liquid phase and affect the mass transfer of hydrogen.

[0009] Since the FCC raw material belongs to heavy and low-quality hydrocarbon oil, there is no report on the process of using liquid phase hydrotreating FCC raw material

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