Deep desulfurization-octane value recovery hydrogenation modification combined method for faulty full-distillation gasoline

Abstract

The invention relates to a hydro-upgrading method of ultra-deep desulfurization and octane number preservation of full range poor gasoline. The poor full range gasoline is contacted and reacted with three different catalysts in three-stage reactions zones. The reaction temperature of the first stage is low, and difficultly deprived sulfur compound is deprived by using high-selective hydrodesulfurization catalyst and olefin is saturated to the minimum; the reaction temperature of the second stage is high, and supplementary desulfuration-hydrocarbon monobranched isomeric / aromatizing catalyst is used for exhaustively depriving sulfur compound and further reducing the content of olefin; the reaction temperature of the third stage is low, and multibranched isomery of remaining olefin and straight-chain paraffin is carried out by using hydrocarbon multibranched hydroisomeric catalyst, thereby improving the octane number of products. The method can obtain better hydro-upgrading effect particularly for medium-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 clean gasoline of national IV or even higher standard.

Description

technical field [0001] The invention relates to a deep desulfurization-recovering octane number hydrogenation upgrading combined method of low-quality full distillate gasoline, which belongs to the field of petroleum refining, and in particular relates to a low-quality gasoline suitable for medium-high sulfur and high olefins, such as catalytic cracking ( FCC) gasoline, the combined process of deep desulfurization-recovering octane number hydrogenation modification. 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] USP 5770047, USP 5417697, etc. introduce the desulfurization and o...

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Problems solved by technology

The olefin content of the product obtained according to this patented method is low, but the sulfur content of the product is difficult to meet the national IV standard of no more than 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, higher aromatics generation (product aromatics higher than raw material 10v%) is extremely unfavorable to the stability of the catalyst; moreover, the catalyst carrier in the patented process requires TiO 2 Mainly, this also greatly reduces the strength of the catalyst, which is not conducive to its long-term stable operation and regeneration

[0014] In short, there have been many researches on low-quality oil products such as Chinese FCC gasoline with high sulfur content and high olefins. Although they are all trying to achieve desulfurization and olefin reduction through different means of upgrading, while improving the octane number of the oil as much as possible, The impact of the isomerization of hydrogenation products on the restoration of octane number is also mentioned, but these disclosed methods have their own advantages and disadvantages, especially all do not pay further attention to the effect of multi-branched isomerization of hydrocarbons on improving the octane number of FCC gasoline the importance of

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

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