Production method for ultra-low sulfur and high-octane number gasoline

Abstract

The invention relates to a production method for ultra-low sulfur and high-octane number gasoline. The method comprises the following steps of: filling a poor-quality full range gasoline raw material in a reaction distillation column to contact the material with a sulfoether catalyst to perform a sulfur ether reaction and fraction cutting so that low-boiling point sulfides, such as thiol and thiophene, are converted into high-boiling point sulfoether which is then transferred into heavy fraction gasoline, wherein the cutting fractionation temperature of light fraction gasoline and the heavy fraction gasoline is 50 to 90 DEG C; contacting the light fraction gasoline with a hydrocarbon highly branched isomerization catalyst; contacting the heavy fraction gasoline with a selective hydrodesulfurization catalyst and a desulfurization-hydrocarbon isomerization / aromatization catalyst; and mixing the treated light fraction gasoline and the heavy fraction gasoline to obtain the ultra-low sulfur and high-octane number gasoline. The method is suitable for modifying poor-quality gasoline, can reach better desulfurization and olefin reduction effects on ultra-high sulfur and high-olefin poor-quality catalytic gasoline, and can maintain or increase the octane number of the product and keep a higher product yield after reaction.

Description

technical field [0001] The invention relates to a method for producing ultra-low sulfur and high-octane gasoline, in particular to a method for producing catalytic cracking (FCC) gasoline in the field of petroleum refining, especially ultra-high-sulphur, high-olefin low-quality FCC gasoline. Desulfurization-recovery octane number hydrogenation upgrading method. Background technique [0002] At present, the high sulfur content and olefin 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. introduced the desulfurization and olefin reduction process mainly based on hydrofining-cracking / single-branched hydroisomerization. The main...

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Problems solved by technology

The olefin content of the product obtained according to this patented method is relatively low, but the sulfur content of the product is difficult to meet the national IV standard of no more than 50μg.g -1 On the other hand, the method is aimed at high sulfur oil. In order to improve the RON of the final blended product, one of the key points of the patented method is to aromatize the heavy distillate gasoline after hydrodesulfurization, but the 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, 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, Although these published methods have their own advantages, it is necessary to explore a more reasonable upgrading process, select a catalyst with appropriate function and activity, achieve ultra-deep desulfurization and greatly reduce olefins while maintaining octane number, and solve the problem of catalyst stability. Problems such as unsatisfactory performance and high processing costs have always been the goals pursued by the field of petroleum refining

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