Method and apparatus for catalytic modification of poor gasoline

Abstract

The present invention discloes a method for catalytic upgrading low-grade gasoline, said method include a fluidized catalytic cracking process, and is characterized by that the partial regenerated catalyst is led out from regenerator, and passed through catalyst coveying pipe and injected into the bed reactor over stripper zone of the settler, and the low-grade gasoline is fed into the bed reactor and contacted with catalyst bed to implement catalytic upgrading treatment of low-grade gasoline. The olefine volume content of the upgraded gasoline can be reduced by 20-50 %, and sulfur content can be reduced by 10-35%.

Description

technical field [0001] The invention belongs to the field of hydrocarbon oil refining, and in particular relates to a method and a device for upgrading low-quality gasoline by using a fluidized catalytic cracking process. Background technique [0002] Petroleum processing, especially gasoline produced by catalytic cracking, coking and thermal cracking, has high olefin and sulfur content. The quality of gasoline produced by the process has become worse. On the one hand, olefins in gasoline are effective components with high octane number, but on the other hand, they produce more pollutants during combustion to pollute the environment. Although the olefins in gasoline can be reduced to a very low level by traditional hydrofinishing, the octane number is greatly lost. Chinese patent CN1302843A discloses the use of two-stage series riser technology, reaction of oil and gas in series, catalyst relay operation, to achieve the purpose of increasing the yield of light oil and impr...

AI Technical Summary

Problems solved by technology

Although the olefins in gasoline can be reduced to a very low level by traditional hydrofinishing, the octane number is greatly lost

Chinese patent CN1302843A discloses the use of a two-stage series riser process technology, reacting oil and gas in series, and catalyst relay operation to achieve the purpose of increasing the yield of light oil and improving the quality of catalytic gasoline, but the process is complicated and the flexibility of device operation is limited. At the same time, due to the two-stage riser reaction oil-gas series operation, the gasoline reforming reaction interacts with other component reactions, the target product selectivity is affected, and the olefin content in gasoline can be reduced by about 15 volume percentage points.

Because the catalyst used in this method is a raw catalyst that has completed the conventional reaction process, its carbon content is high and its activity is very low, so the olefin conversion effect is relatively low when the stripping section is in contact with gasoline

Chinese patent specification CN1401742A discloses a method and device for catalytic upgrading of low-quality gasoline. The method uses the stripping section of the settler of the catalytic cracking unit to catalytically upgrade low-quality gasoline, and injects the regenerated catalyst into the stripping section through the catalyst delivery pipe. Gasoline enters the stripping section for upgrading, and the olefins of the modified gasoline are reduced by more than 15 volume percentage points, but the stripping effect of the stripping section is relatively poor

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