Hydrogenation modification method for faulty gasoline

Abstract

The invention relates to a hydro-upgrading method of poor gasoline. The invention provides a hydro-upgrading method of ultra-deep desulfurization and octane number preservation of poor gasoline, including the followings: poor full range gasoline is divided into light range gasoline and heavy range gasoline; the weight range gasoline is contacted with selective hydrobon catalyst in the first-stage reaction zone so that the reaction effluent in the second-stage reaction zone is contacted with desulfuration-hydrocarbon multibranched hydroisomeric catalyst and the reaction effluent in the third-stage reaction zone is contacted with supplementary desulfuration-hydrocarbon monobranched isomeric/aromatizing catalyst; and then the reaction effluent and the light range gasoline are mixed according to a proportion so as to obtain ultra clean gasoline product. The hydro-upgrading method is applied to hydro-upgrading for poor gasoline, particularly for ultra-high-sulfur and high-olefin poor catalytically cracked gasoline, can maintain or improve the product octane number and keep higher product liquid yield while greatly reducing the contents of olefin and sulfur, and can produce ultra clean gasoline of national IV or even higher standard.

Description

technical field [0001] The invention relates to a method for hydrogenation and upgrading of low-quality gasoline, in particular to a deep desulfurization-recovery octane method for low-quality gasoline in the field of petroleum refining, especially low-quality catalytic cracked gasoline (FCC) gasoline with medium, high sulfur and high olefins value hydrogenation upgrading method. Background technique [0002] At present, the high olefin content and sulfur content in FCC gasoline have become the key problems that plague the world's clean gasoline production. In the case of less high-octane reformed gasoline and alkylated gasoline, in order to meet the increasingly stringent clean gasoline standards, FCC gasoline hydro-upgrading has become one of the key technologies for the production of clean fuel for vehicles . [0003] USP5770047, USP5417697, USP5411658 and USP5308471 disclose desulfurization and olefin reduction processes mainly based on hydrofining-cracking / single-bran...

AI Technical Summary

Problems solved by technology

[0005] CN145666A (Chinese Patent Application No.: 02121595.2) provides a method for deeply desulfurizing and reducing olefins in gasoline, which is aimed at the above-mentioned characteristics of Chinese FCC gasoline, and implements hydrodesulfurization and denitrogenation of hydrogenation catalysts and saturated heavy gasoline fractions with olefins. Using an octane recovery catalyst with sufficient acidic function, the cracking of low-octane alkane molecules and the isomerization of alkane molecules are realized, and then the modified light and heavy fractions are mixed to form the final modified product. According to the introduction of this patent, since olefins are completely hydrogenated and saturated in the first stage of the reaction, in order to restore the octane number of the product, it is necessary to increase the cracking capacity of the catalyst, at the cost of a significant reduction in the product liquid yield (only 86%), and Significantly higher processing costs

However, this method is mainly aimed at low-sulfur FCC gasoline. Under the premise of reducing the loss of RON as much as possible, the desulfurization rate is low and the decline rate of olefins is small. The quality of the obtained product cannot meet the clean gasoline standards of China III and China IV. raw oil

[0008] CN1488724A (Chinese patent application number: 02133130.8) discloses a FCC gasoline hydrofinishing-aromatization process based on a nano-zeolite catalyst, wherein, after the full fraction FCC gasoline is converted into alkane through hydrotreating, most of the olefins are converted into alkane, and then Aromatization of alkanes on nano-zeolite catalysts has a high desulfurization rate and a large drop in olefins, but the liquid yield of the product is only about 90wt.%, the product RON loss is 2.0-3.0 units, and the preparation of nano-zeolite is complicated and the regeneration performance is not good , therefore, the processing cost of this process is high, the product octane number loss is relatively large, and it is difficult to adapt to industrial production

The olefin content of the obtained product is low, but the sulfur content of the product is difficult to meet the national IV standard of 50μg·g -1 requirements; on the other hand, this method is aimed at high-sulfur oil, in order to improve the RON of the final blended product, one of the key points of this patented method is to aromatize heavy distillate gasoline after hydrodesulfurization, but aromatics are coke Precursor, the higher amount of aromatics generated in this process (product aromatics are higher than raw material by more than 10v%) is extremely unfavorable to the stability of the catalyst; in addition, the catalyst carrier in this process is made of TiO 2 Mainly, this greatly reduces the strength of the catalyst, which is not conducive to its long-term stable operation and regeneration

[0013] In short, for low-quality oil products such as my country’s FCC gasoline with high sulfur content and high olefins, although many studies have tried to achieve desulfurization and olefin reduction through different means of upgrading, while maintaining and improving the octane number of the oil as much as possible, Also mentioned the impact of single-chain isomerization of hydrogenation products on the recovery of octane number, but these disclosed methods each have their advantages and disadvantages, especially no further attention to environmentally friendly hydrocarbon multi-branched isomerization pairs Importance of Increasing FCC Gasoline Octane

To explore a more reasonable upgrading process, select catalysts with appropriate functions and activities, achieve deep desulfurization and olefin reduction while maintaining octane number, and solve the problems of unsatisfactory catalyst stability and high processing costs. The goal pursued by the refining field

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