Efficient combined production method for gasoline with ultralow sulfur and high octane value

Abstract

The invention relates to an efficient combined production method for gasoline with ultralow sulfur and high octane value. The production method comprises the following steps of: performing low-temperature directional sulfur transfer reaction on a poor-quality full fraction gasoline raw material under the hydrogen condition, and then performing oil cutting and fractionation to obtain light fraction gasoline and heavy fraction gasoline, wherein the cutting and fractionation temperature is 50 to 90 DEG C; making the heavy fraction gasoline contact with a selective hydrogenation desulfurization catalyst and a supplemented desulfurization-hydrocarbon heterogeneous / aromatized catalyst; and mixing the light fraction gasoline and the treated heavy fraction gasoline to obtain a gasoline product with ultralow sulfur and high octane value. The method is suitable for modifying the poor-quality gasoline, can achieve good super-deep desulfurization and olefin reducing effects particularly for the poor-quality catalytically cracked gasoline with ultrahigh sulfur and high olefin, and can maintain or improve the octane value of the product after reaction and keep high product yield.

Description

technical field [0001] The invention relates to a high-efficiency combined production method of ultra-low sulfur and high-octane gasoline, in particular to a method for catalytic cracking (FCC) gasoline in the field of petroleum refining, especially low-quality FCC gasoline with ultra-high sulfur and high olefins Ultra-deep desulfurization-recovering 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-bra...

AI Technical Summary

Problems solved by technology

The olefin content of the product obtained according to the patented method is relatively low, but the sulfur content of the product is difficult to meet the national IV standard of no more than 50 μg.g -1 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 keys of this method is to aromatize the heavy distillate gasoline after hydrodesulfurization, but aromatics are the precursor of coke matter, the higher amount of aromatics generation (product aromatics higher than raw material 10v%) is extremely unfavorable to the stability of the catalyst; moreover, the catalyst support in the method 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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