Method for realizing selective reprocessing of catalytic cracking reprocessed oil slurry

Abstract

The invention discloses a method for realizing selective reprocessing of catalytic cracking reprocessed oil slurry. The method comprises the steps of conveying reprocessed oil slurry produced by a catalytic cracking device into a reduced-pressure rectification column for rectification under reduced pressure, separating out low-carbon-residue fractions of which the boiling point is lower than 500 to 550 DEG C and sending the low-carbon-residue fractions to a reprocessing device. The method first performs reduced-pressure rectification on the reprocessed oil slurry produced by the catalytic cracking device through the reduced-pressure rectification column, then separates the low-carbon-residue fractions out from the reprocessed oil slurry, and sends the low-carbon-residue fractions to the reprocessing device. Because high-carbon-residue fractions do not enter the reprocessing device, the occurrence of coke generation of the reprocessing device is fundamentally avoided; the processing capacity of the device is improved; the energy consumption and maintenance cost of the device are reduced; and the energy consumption of the device can be reduced by more than 10 percent. In addition, the method also greatly reduces processing loss and increases the yield of lightweight oil by about 1 to 3 percent, thereby having significant economic benefit.

Description

1. Technical field [0001] The invention belongs to the technical field of petrochemical industry, and in particular relates to a method for realizing selective re-refining of catalytic cracking re-refining oil slurry. 2. Background technology [0002] At present, in the existing petroleum refining technology, the catalytic cracking unit, as an important means of petroleum secondary processing, occupies a pivotal position in every refinery. During the catalytic cracking production process, a large amount of oil slurry will be produced at the bottom of the unit, and this part of the oil slurry is usually sent to the refining unit for recycling as recycled slurry. Refined oil slurry is generally composed of high carbon residue fractions with a boiling point greater than 500-550°C and low carbon residue fractions with a boiling point of less than 500-550°C, each of which accounts for about 50%. Among them, the fraction with a boiling point greater than 500-550°C, due to the hig...

AI Technical Summary

Problems solved by technology

Among them, the fraction with a boiling point greater than 500-550°C, due to the high carbon residue, can easily lead to coking in the refining device, which not only increases the energy consumption and maintenance cost of the device, but also reduces the processing capacity of the device and increases the processing loss. The earth affects the economic benefits

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